diff --git a/dashboard/apps/web/littlehorse-public-api/acls.ts b/dashboard/apps/web/littlehorse-public-api/acls.ts
index de3f3c4e5..6242f2f5e 100644
--- a/dashboard/apps/web/littlehorse-public-api/acls.ts
+++ b/dashboard/apps/web/littlehorse-public-api/acls.ts
@@ -1016,7 +1016,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/external_event.ts b/dashboard/apps/web/littlehorse-public-api/external_event.ts
index bd0bca3ef..e89822485 100644
--- a/dashboard/apps/web/littlehorse-public-api/external_event.ts
+++ b/dashboard/apps/web/littlehorse-public-api/external_event.ts
@@ -338,7 +338,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/node_run.ts b/dashboard/apps/web/littlehorse-public-api/node_run.ts
index 47d045e66..69fe060ec 100644
--- a/dashboard/apps/web/littlehorse-public-api/node_run.ts
+++ b/dashboard/apps/web/littlehorse-public-api/node_run.ts
@@ -1262,7 +1262,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/object_id.ts b/dashboard/apps/web/littlehorse-public-api/object_id.ts
index 724c0c389..a55508119 100644
--- a/dashboard/apps/web/littlehorse-public-api/object_id.ts
+++ b/dashboard/apps/web/littlehorse-public-api/object_id.ts
@@ -1241,7 +1241,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/service.ts b/dashboard/apps/web/littlehorse-public-api/service.ts
index 4e6979ae8..8dbff6c80 100644
--- a/dashboard/apps/web/littlehorse-public-api/service.ts
+++ b/dashboard/apps/web/littlehorse-public-api/service.ts
@@ -8638,7 +8638,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/task_def.ts b/dashboard/apps/web/littlehorse-public-api/task_def.ts
index 69feae403..c382810b8 100644
--- a/dashboard/apps/web/littlehorse-public-api/task_def.ts
+++ b/dashboard/apps/web/littlehorse-public-api/task_def.ts
@@ -117,7 +117,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/task_run.ts b/dashboard/apps/web/littlehorse-public-api/task_run.ts
index a8c7601c7..f428cff64 100644
--- a/dashboard/apps/web/littlehorse-public-api/task_run.ts
+++ b/dashboard/apps/web/littlehorse-public-api/task_run.ts
@@ -871,7 +871,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/user_tasks.ts b/dashboard/apps/web/littlehorse-public-api/user_tasks.ts
index 60346777d..8a50ecf2a 100644
--- a/dashboard/apps/web/littlehorse-public-api/user_tasks.ts
+++ b/dashboard/apps/web/littlehorse-public-api/user_tasks.ts
@@ -1666,7 +1666,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/variable.ts b/dashboard/apps/web/littlehorse-public-api/variable.ts
index cbc667a6f..f0807341d 100644
--- a/dashboard/apps/web/littlehorse-public-api/variable.ts
+++ b/dashboard/apps/web/littlehorse-public-api/variable.ts
@@ -327,7 +327,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/wf_run.ts b/dashboard/apps/web/littlehorse-public-api/wf_run.ts
index 9d76f0fff..4c65b7c52 100644
--- a/dashboard/apps/web/littlehorse-public-api/wf_run.ts
+++ b/dashboard/apps/web/littlehorse-public-api/wf_run.ts
@@ -1470,7 +1470,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/dashboard/apps/web/littlehorse-public-api/wf_spec.ts b/dashboard/apps/web/littlehorse-public-api/wf_spec.ts
index ee3d8ee6b..070417209 100644
--- a/dashboard/apps/web/littlehorse-public-api/wf_spec.ts
+++ b/dashboard/apps/web/littlehorse-public-api/wf_spec.ts
@@ -119,6 +119,12 @@ export interface WfSpec_ThreadSpecsEntry {
 export interface WfSpec_ParentWfSpecReference {
   /** Name of the Parent WfSpec */
   wfSpecName: string;
+  /**
+   * FOR NOW: no validation of variables on parent. In the future we will pass
+   * wf_spec_major_version, but we should probably examine the rules for
+   * evolution in the future.
+   */
+  wfSpecMajorVersion: number;
 }
 
 export interface WorkflowRetentionPolicy {
@@ -660,7 +666,7 @@ export const WfSpec_ThreadSpecsEntry = {
 };
 
 function createBaseWfSpec_ParentWfSpecReference(): WfSpec_ParentWfSpecReference {
-  return { wfSpecName: "" };
+  return { wfSpecName: "", wfSpecMajorVersion: 0 };
 }
 
 export const WfSpec_ParentWfSpecReference = {
@@ -668,6 +674,9 @@ export const WfSpec_ParentWfSpecReference = {
     if (message.wfSpecName !== "") {
       writer.uint32(10).string(message.wfSpecName);
     }
+    if (message.wfSpecMajorVersion !== 0) {
+      writer.uint32(16).int32(message.wfSpecMajorVersion);
+    }
     return writer;
   },
 
@@ -685,6 +694,13 @@ export const WfSpec_ParentWfSpecReference = {
 
           message.wfSpecName = reader.string();
           continue;
+        case 2:
+          if (tag !== 16) {
+            break;
+          }
+
+          message.wfSpecMajorVersion = reader.int32();
+          continue;
       }
       if ((tag & 7) === 4 || tag === 0) {
         break;
@@ -695,7 +711,10 @@ export const WfSpec_ParentWfSpecReference = {
   },
 
   fromJSON(object: any): WfSpec_ParentWfSpecReference {
-    return { wfSpecName: isSet(object.wfSpecName) ? globalThis.String(object.wfSpecName) : "" };
+    return {
+      wfSpecName: isSet(object.wfSpecName) ? globalThis.String(object.wfSpecName) : "",
+      wfSpecMajorVersion: isSet(object.wfSpecMajorVersion) ? globalThis.Number(object.wfSpecMajorVersion) : 0,
+    };
   },
 
   toJSON(message: WfSpec_ParentWfSpecReference): unknown {
@@ -703,6 +722,9 @@ export const WfSpec_ParentWfSpecReference = {
     if (message.wfSpecName !== "") {
       obj.wfSpecName = message.wfSpecName;
     }
+    if (message.wfSpecMajorVersion !== 0) {
+      obj.wfSpecMajorVersion = Math.round(message.wfSpecMajorVersion);
+    }
     return obj;
   },
 
@@ -712,6 +734,7 @@ export const WfSpec_ParentWfSpecReference = {
   fromPartial<I extends Exact<DeepPartial<WfSpec_ParentWfSpecReference>, I>>(object: I): WfSpec_ParentWfSpecReference {
     const message = createBaseWfSpec_ParentWfSpecReference();
     message.wfSpecName = object.wfSpecName ?? "";
+    message.wfSpecMajorVersion = object.wfSpecMajorVersion ?? 0;
     return message;
   },
 };
@@ -3448,7 +3471,7 @@ export type Exact<P, I extends P> = P extends Builtin ? P
 
 function toTimestamp(dateStr: string): Timestamp {
   const date = new globalThis.Date(dateStr);
-  const seconds = date.getTime() / 1_000;
+  const seconds = Math.trunc(date.getTime() / 1_000);
   const nanos = (date.getTime() % 1_000) * 1_000_000;
   return { seconds, nanos };
 }
diff --git a/schemas/variable.proto b/schemas/variable.proto
index faead307f..c82e33cf9 100644
--- a/schemas/variable.proto
+++ b/schemas/variable.proto
@@ -4,7 +4,6 @@ package littlehorse;
 
 import "google/protobuf/timestamp.proto";
 import "object_id.proto";
-import "wf_spec.proto";
 
 option go_package = ".;model";
 option java_multiple_files = true;
@@ -29,5 +28,4 @@ message Variable {
   VariableValue value = 2;
   google.protobuf.Timestamp created_at = 3;
   WfSpecId wf_spec_id = 4;
-  ThreadVarDef thread_var_def = 5;
 }
diff --git a/schemas/wf_spec.proto b/schemas/wf_spec.proto
index d3f26b1d4..3fa7fe720 100644
--- a/schemas/wf_spec.proto
+++ b/schemas/wf_spec.proto
@@ -35,6 +35,7 @@ message WfSpec {
   message ParentWfSpecReference {
     // Name of the Parent WfSpec
     string wf_spec_name = 1;
+    int32 wf_spec_major_version = 2;
     // FOR NOW: no validation of variables on parent. In the future we will pass
     // wf_spec_major_version, but we should probably examine the rules for
     // evolution in the future.
diff --git a/sdk-go/common/model/wf_spec.pb.go b/sdk-go/common/model/wf_spec.pb.go
index 55a5bb56e..b77314905 100644
--- a/sdk-go/common/model/wf_spec.pb.go
+++ b/sdk-go/common/model/wf_spec.pb.go
@@ -1886,7 +1886,8 @@ type WfSpec_ParentWfSpecReference struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Name of the Parent WfSpec
-	WfSpecName string `protobuf:"bytes,1,opt,name=wf_spec_name,json=wfSpecName,proto3" json:"wf_spec_name,omitempty"`
+	WfSpecName         string `protobuf:"bytes,1,opt,name=wf_spec_name,json=wfSpecName,proto3" json:"wf_spec_name,omitempty"`
+	WfSpecMajorVersion int32  `protobuf:"varint,2,opt,name=wf_spec_major_version,json=wfSpecMajorVersion,proto3" json:"wf_spec_major_version,omitempty"`
 }
 
 func (x *WfSpec_ParentWfSpecReference) Reset() {
@@ -1928,6 +1929,13 @@ func (x *WfSpec_ParentWfSpecReference) GetWfSpecName() string {
 	return ""
 }
 
+func (x *WfSpec_ParentWfSpecReference) GetWfSpecMajorVersion() int32 {
+	if x != nil {
+		return x.WfSpecMajorVersion
+	}
+	return 0
+}
+
 type WaitForThreadsNode_ThreadToWaitFor struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1985,7 +1993,7 @@ var file_wf_spec_proto_rawDesc = []byte{
 	0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x5f, 0x65, 0x6e, 0x75, 0x6d, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x1a, 0x13, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x5f, 0x77, 0x66, 0x73, 0x70, 0x65, 0x63,
 	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x0f, 0x6f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x5f, 0x69,
-	0x64, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xa2, 0x06, 0x0a, 0x06, 0x57, 0x66, 0x53, 0x70,
+	0x64, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xd5, 0x06, 0x0a, 0x06, 0x57, 0x66, 0x53, 0x70,
 	0x65, 0x63, 0x12, 0x25, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x15,
 	0x2e, 0x6c, 0x69, 0x74, 0x74, 0x6c, 0x65, 0x68, 0x6f, 0x72, 0x73, 0x65, 0x2e, 0x57, 0x66, 0x53,
 	0x70, 0x65, 0x63, 0x49, 0x64, 0x52, 0x02, 0x69, 0x64, 0x12, 0x39, 0x0a, 0x0a, 0x63, 0x72, 0x65,
@@ -2028,354 +2036,357 @@ var file_wf_spec_proto_rawDesc = []byte{
 	0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x2d, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75,
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 }
 
 var (
diff --git a/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpec.java b/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpec.java
index 2214d4e33..31abfbf05 100644
--- a/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpec.java
+++ b/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpec.java
@@ -76,6 +76,18 @@ public interface ParentWfSpecReferenceOrBuilder extends
      */
     com.google.protobuf.ByteString
         getWfSpecNameBytes();
+
+    /**
+     * <pre>
+     * FOR NOW: no validation of variables on parent. In the future we will pass
+     * wf_spec_major_version, but we should probably examine the rules for
+     * evolution in the future.
+     * </pre>
+     *
+     * <code>int32 wf_spec_major_version = 2;</code>
+     * @return The wfSpecMajorVersion.
+     */
+    int getWfSpecMajorVersion();
   }
   /**
    * <pre>
@@ -169,6 +181,23 @@ public java.lang.String getWfSpecName() {
       }
     }
 
+    public static final int WF_SPEC_MAJOR_VERSION_FIELD_NUMBER = 2;
+    private int wfSpecMajorVersion_ = 0;
+    /**
+     * <pre>
+     * FOR NOW: no validation of variables on parent. In the future we will pass
+     * wf_spec_major_version, but we should probably examine the rules for
+     * evolution in the future.
+     * </pre>
+     *
+     * <code>int32 wf_spec_major_version = 2;</code>
+     * @return The wfSpecMajorVersion.
+     */
+    @java.lang.Override
+    public int getWfSpecMajorVersion() {
+      return wfSpecMajorVersion_;
+    }
+
     private byte memoizedIsInitialized = -1;
     @java.lang.Override
     public final boolean isInitialized() {
@@ -186,6 +215,9 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(wfSpecName_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, wfSpecName_);
       }
+      if (wfSpecMajorVersion_ != 0) {
+        output.writeInt32(2, wfSpecMajorVersion_);
+      }
       getUnknownFields().writeTo(output);
     }
 
@@ -198,6 +230,10 @@ public int getSerializedSize() {
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(wfSpecName_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, wfSpecName_);
       }
+      if (wfSpecMajorVersion_ != 0) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeInt32Size(2, wfSpecMajorVersion_);
+      }
       size += getUnknownFields().getSerializedSize();
       memoizedSize = size;
       return size;
@@ -215,6 +251,8 @@ public boolean equals(final java.lang.Object obj) {
 
       if (!getWfSpecName()
           .equals(other.getWfSpecName())) return false;
+      if (getWfSpecMajorVersion()
+          != other.getWfSpecMajorVersion()) return false;
       if (!getUnknownFields().equals(other.getUnknownFields())) return false;
       return true;
     }
@@ -228,6 +266,8 @@ public int hashCode() {
       hash = (19 * hash) + getDescriptor().hashCode();
       hash = (37 * hash) + WF_SPEC_NAME_FIELD_NUMBER;
       hash = (53 * hash) + getWfSpecName().hashCode();
+      hash = (37 * hash) + WF_SPEC_MAJOR_VERSION_FIELD_NUMBER;
+      hash = (53 * hash) + getWfSpecMajorVersion();
       hash = (29 * hash) + getUnknownFields().hashCode();
       memoizedHashCode = hash;
       return hash;
@@ -369,6 +409,7 @@ public Builder clear() {
         super.clear();
         bitField0_ = 0;
         wfSpecName_ = "";
+        wfSpecMajorVersion_ = 0;
         return this;
       }
 
@@ -405,6 +446,9 @@ private void buildPartial0(io.littlehorse.sdk.common.proto.WfSpec.ParentWfSpecRe
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.wfSpecName_ = wfSpecName_;
         }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.wfSpecMajorVersion_ = wfSpecMajorVersion_;
+        }
       }
 
       @java.lang.Override
@@ -456,6 +500,9 @@ public Builder mergeFrom(io.littlehorse.sdk.common.proto.WfSpec.ParentWfSpecRefe
           bitField0_ |= 0x00000001;
           onChanged();
         }
+        if (other.getWfSpecMajorVersion() != 0) {
+          setWfSpecMajorVersion(other.getWfSpecMajorVersion());
+        }
         this.mergeUnknownFields(other.getUnknownFields());
         onChanged();
         return this;
@@ -487,6 +534,11 @@ public Builder mergeFrom(
                 bitField0_ |= 0x00000001;
                 break;
               } // case 10
+              case 16: {
+                wfSpecMajorVersion_ = input.readInt32();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 16
               default: {
                 if (!super.parseUnknownField(input, extensionRegistry, tag)) {
                   done = true; // was an endgroup tag
@@ -595,6 +647,56 @@ public Builder setWfSpecNameBytes(
         onChanged();
         return this;
       }
+
+      private int wfSpecMajorVersion_ ;
+      /**
+       * <pre>
+       * FOR NOW: no validation of variables on parent. In the future we will pass
+       * wf_spec_major_version, but we should probably examine the rules for
+       * evolution in the future.
+       * </pre>
+       *
+       * <code>int32 wf_spec_major_version = 2;</code>
+       * @return The wfSpecMajorVersion.
+       */
+      @java.lang.Override
+      public int getWfSpecMajorVersion() {
+        return wfSpecMajorVersion_;
+      }
+      /**
+       * <pre>
+       * FOR NOW: no validation of variables on parent. In the future we will pass
+       * wf_spec_major_version, but we should probably examine the rules for
+       * evolution in the future.
+       * </pre>
+       *
+       * <code>int32 wf_spec_major_version = 2;</code>
+       * @param value The wfSpecMajorVersion to set.
+       * @return This builder for chaining.
+       */
+      public Builder setWfSpecMajorVersion(int value) {
+
+        wfSpecMajorVersion_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * <pre>
+       * FOR NOW: no validation of variables on parent. In the future we will pass
+       * wf_spec_major_version, but we should probably examine the rules for
+       * evolution in the future.
+       * </pre>
+       *
+       * <code>int32 wf_spec_major_version = 2;</code>
+       * @return This builder for chaining.
+       */
+      public Builder clearWfSpecMajorVersion() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        wfSpecMajorVersion_ = 0;
+        onChanged();
+        return this;
+      }
       @java.lang.Override
       public final Builder setUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
diff --git a/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpecOuterClass.java b/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpecOuterClass.java
index 35fe53df1..7d6b3b004 100644
--- a/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpecOuterClass.java
+++ b/sdk-java/src/main/java/io/littlehorse/sdk/common/proto/WfSpecOuterClass.java
@@ -191,7 +191,7 @@ public static void registerAllExtensions(
       "\n\rwf_spec.proto\022\013littlehorse\032\037google/pro" +
       "tobuf/timestamp.proto\032\022common_enums.prot" +
       "o\032\023common_wfspec.proto\032\017object_id.proto\"" +
-      "\225\005\n\006WfSpec\022!\n\002id\030\001 \001(\0132\025.littlehorse.WfS" +
+      "\264\005\n\006WfSpec\022!\n\002id\030\001 \001(\0132\025.littlehorse.WfS" +
       "pecId\022.\n\ncreated_at\030\002 \001(\0132\032.google.proto" +
       "buf.Timestamp\0223\n\020frozen_variables\030\003 \003(\0132" +
       "\031.littlehorse.ThreadVarDef\022+\n\006status\030\004 \001" +
@@ -205,121 +205,122 @@ public static void registerAllExtensions(
       "littlehorse.WfSpec.ParentWfSpecReference" +
       "H\002\210\001\001\032K\n\020ThreadSpecsEntry\022\013\n\003key\030\001 \001(\t\022&" +
       "\n\005value\030\002 \001(\0132\027.littlehorse.ThreadSpec:\002" +
-      "8\001\032-\n\025ParentWfSpecReference\022\024\n\014wf_spec_n" +
-      "ame\030\001 \001(\tB\023\n\021_retention_policyB\014\n\n_migra" +
-      "tionB\021\n\017_parent_wf_spec\"Q\n\027WorkflowReten" +
-      "tionPolicy\022&\n\034seconds_after_wf_terminati" +
-      "on\030\001 \001(\003H\000B\016\n\014wf_gc_policy\"N\n\tJsonIndex\022" +
-      "\022\n\nfield_path\030\001 \001(\t\022-\n\nfield_type\030\002 \001(\0162" +
-      "\031.littlehorse.VariableType\"B\n\025Searchable" +
-      "VariableDef\022)\n\007var_def\030\001 \001(\0132\030.littlehor" +
-      "se.VariableDef\"\312\001\n\014ThreadVarDef\022)\n\007var_d" +
-      "ef\030\001 \001(\0132\030.littlehorse.VariableDef\022\020\n\010re" +
-      "quired\030\002 \001(\010\022\022\n\nsearchable\030\003 \001(\010\022,\n\014json" +
-      "_indexes\030\004 \003(\0132\026.littlehorse.JsonIndex\022;" +
-      "\n\014access_level\030\005 \001(\0162%.littlehorse.WfRun" +
-      "VariableAccessLevel\"\275\002\n\nThreadSpec\0221\n\005no" +
-      "des\030\001 \003(\0132\".littlehorse.ThreadSpec.Nodes" +
-      "Entry\0220\n\rvariable_defs\030\002 \003(\0132\031.littlehor" +
-      "se.ThreadVarDef\0221\n\016interrupt_defs\030\003 \003(\0132" +
-      "\031.littlehorse.InterruptDef\022A\n\020retention_" +
-      "policy\030\004 \001(\0132\".littlehorse.ThreadRetenti" +
-      "onPolicyH\000\210\001\001\032?\n\nNodesEntry\022\013\n\003key\030\001 \001(\t" +
-      "\022 \n\005value\030\002 \001(\0132\021.littlehorse.Node:\0028\001B\023" +
-      "\n\021_retention_policy\"W\n\025ThreadRetentionPo" +
-      "licy\022*\n seconds_after_thread_termination" +
-      "\030\001 \001(\003H\000B\022\n\020thread_gc_policy\"i\n\014Interrup" +
-      "tDef\022>\n\025external_event_def_id\030\001 \001(\0132\037.li" +
-      "ttlehorse.ExternalEventDefId\022\031\n\021handler_" +
-      "spec_name\030\002 \001(\t\"\276\001\n\017StartThreadNode\022\030\n\020t" +
-      "hread_spec_name\030\001 \001(\t\022>\n\tvariables\030\002 \003(\013" +
-      "2+.littlehorse.StartThreadNode.Variables" +
-      "Entry\032Q\n\016VariablesEntry\022\013\n\003key\030\001 \001(\t\022.\n\005" +
-      "value\030\002 \001(\0132\037.littlehorse.VariableAssign" +
-      "ment:\0028\001\"\203\002\n\030StartMultipleThreadsNode\022\030\n" +
-      "\020thread_spec_name\030\001 \001(\t\022G\n\tvariables\030\002 \003" +
-      "(\01324.littlehorse.StartMultipleThreadsNod" +
-      "e.VariablesEntry\0221\n\010iterable\030\003 \001(\0132\037.lit" +
-      "tlehorse.VariableAssignment\032Q\n\016Variables" +
-      "Entry\022\013\n\003key\030\001 \001(\t\022.\n\005value\030\002 \001(\0132\037.litt" +
-      "lehorse.VariableAssignment:\0028\001\"\360\001\n\021Failu" +
-      "reHandlerDef\022\031\n\021handler_spec_name\030\002 \001(\t\022" +
-      "\032\n\020specific_failure\030\001 \001(\tH\000\022K\n\023any_failu" +
-      "re_of_type\030\003 \001(\0162,.littlehorse.FailureHa" +
-      "ndlerDef.LHFailureTypeH\000\"C\n\rLHFailureTyp" +
-      "e\022\026\n\022FAILURE_TYPE_ERROR\020\000\022\032\n\026FAILURE_TYP" +
-      "E_EXCEPTION\020\001B\022\n\020failure_to_catch\"\243\002\n\022Wa" +
-      "itForThreadsNode\022@\n\007threads\030\001 \003(\0132/.litt" +
-      "lehorse.WaitForThreadsNode.ThreadToWaitF" +
-      "or\0229\n\013thread_list\030\003 \001(\0132\037.littlehorse.Va" +
-      "riableAssignmentH\000\210\001\001\0221\n\006policy\030\002 \001(\0162!." +
-      "littlehorse.WaitForThreadsPolicy\032M\n\017Thre" +
-      "adToWaitFor\022:\n\021thread_run_number\030\001 \001(\0132\037" +
-      ".littlehorse.VariableAssignmentB\016\n\014_thre" +
-      "ad_list\"\215\001\n\021ExternalEventNode\022>\n\025externa" +
-      "l_event_def_id\030\001 \001(\0132\037.littlehorse.Exter" +
-      "nalEventDefId\0228\n\017timeout_seconds\030\002 \001(\0132\037" +
-      ".littlehorse.VariableAssignment\"\020\n\016Entry" +
-      "pointNode\"M\n\010ExitNode\0221\n\013failure_def\030\001 \001" +
-      "(\0132\027.littlehorse.FailureDefH\000\210\001\001B\016\n\014_fai" +
-      "lure_def\"v\n\nFailureDef\022\024\n\014failure_name\030\001" +
-      " \001(\t\022\017\n\007message\030\002 \001(\t\0225\n\007content\030\003 \001(\0132\037" +
-      ".littlehorse.VariableAssignmentH\000\210\001\001B\n\n\010" +
-      "_content\"\350\004\n\004Node\022)\n\016outgoing_edges\030\001 \003(" +
-      "\0132\021.littlehorse.Edge\0228\n\020failure_handlers" +
-      "\030\004 \003(\0132\036.littlehorse.FailureHandlerDef\0221" +
-      "\n\nentrypoint\030\005 \001(\0132\033.littlehorse.Entrypo" +
-      "intNodeH\000\022%\n\004exit\030\006 \001(\0132\025.littlehorse.Ex" +
-      "itNodeH\000\022%\n\004task\030\007 \001(\0132\025.littlehorse.Tas" +
-      "kNodeH\000\0228\n\016external_event\030\010 \001(\0132\036.little" +
-      "horse.ExternalEventNodeH\000\0224\n\014start_threa" +
-      "d\030\t \001(\0132\034.littlehorse.StartThreadNodeH\000\022" +
-      ";\n\020wait_for_threads\030\n \001(\0132\037.littlehorse." +
-      "WaitForThreadsNodeH\000\022#\n\003nop\030\013 \001(\0132\024.litt" +
-      "lehorse.NopNodeH\000\022\'\n\005sleep\030\014 \001(\0132\026.littl" +
-      "ehorse.SleepNodeH\000\022.\n\tuser_task\030\r \001(\0132\031." +
-      "littlehorse.UserTaskNodeH\000\022G\n\026start_mult" +
-      "iple_threads\030\017 \001(\0132%.littlehorse.StartMu" +
-      "ltipleThreadsNodeH\000B\006\n\004node\"\342\002\n\014UserTask" +
-      "Node\022\032\n\022user_task_def_name\030\001 \001(\t\0228\n\nuser" +
-      "_group\030\002 \001(\0132\037.littlehorse.VariableAssig" +
-      "nmentH\000\210\001\001\0225\n\007user_id\030\003 \001(\0132\037.littlehors" +
-      "e.VariableAssignmentH\001\210\001\001\022-\n\007actions\030\004 \003" +
-      "(\0132\034.littlehorse.UTActionTrigger\022\"\n\025user" +
-      "_task_def_version\030\005 \001(\005H\002\210\001\001\0223\n\005notes\030\006 " +
-      "\001(\0132\037.littlehorse.VariableAssignmentH\003\210\001" +
-      "\001B\r\n\013_user_groupB\n\n\010_user_idB\030\n\026_user_ta" +
-      "sk_def_versionB\010\n\006_notes\"\233\001\n\rEdgeConditi" +
-      "on\022+\n\ncomparator\030\001 \001(\0162\027.littlehorse.Com" +
-      "parator\022-\n\004left\030\002 \001(\0132\037.littlehorse.Vari" +
-      "ableAssignment\022.\n\005right\030\003 \001(\0132\037.littleho" +
-      "rse.VariableAssignment\"\233\001\n\004Edge\022\026\n\016sink_" +
-      "node_name\030\001 \001(\t\0222\n\tcondition\030\002 \001(\0132\032.lit" +
-      "tlehorse.EdgeConditionH\000\210\001\001\0229\n\022variable_" +
-      "mutations\030\003 \003(\0132\035.littlehorse.VariableMu" +
-      "tationB\014\n\n_condition\"\t\n\007NopNode\"\276\001\n\tSlee" +
-      "pNode\0226\n\013raw_seconds\030\001 \001(\0132\037.littlehorse" +
-      ".VariableAssignmentH\000\0224\n\ttimestamp\030\002 \001(\013" +
-      "2\037.littlehorse.VariableAssignmentH\000\0223\n\010i" +
-      "so_date\030\003 \001(\0132\037.littlehorse.VariableAssi" +
-      "gnmentH\000B\016\n\014sleep_length\"\207\002\n\026WfSpecVersi" +
-      "onMigration\022\031\n\021new_major_version\030\001 \001(\005\022\024" +
-      "\n\014new_revision\030\002 \001(\005\022]\n\026thread_spec_migr" +
-      "ations\030\003 \003(\0132=.littlehorse.WfSpecVersion" +
-      "Migration.ThreadSpecMigrationsEntry\032]\n\031T" +
-      "hreadSpecMigrationsEntry\022\013\n\003key\030\001 \001(\t\022/\n" +
-      "\005value\030\002 \001(\0132 .littlehorse.ThreadSpecMig" +
-      "ration:\0028\001\"\325\001\n\023ThreadSpecMigration\022\034\n\024ne" +
-      "w_thread_spec_name\030\001 \001(\t\022M\n\017node_migrati" +
-      "ons\030\002 \003(\01324.littlehorse.ThreadSpecMigrat" +
-      "ion.NodeMigrationsEntry\032Q\n\023NodeMigration" +
-      "sEntry\022\013\n\003key\030\001 \001(\t\022)\n\005value\030\002 \001(\0132\032.lit" +
-      "tlehorse.NodeMigration:\0028\001\"&\n\rNodeMigrat" +
-      "ion\022\025\n\rnew_node_name\030\001 \001(\t*N\n\030WfRunVaria" +
-      "bleAccessLevel\022\016\n\nPUBLIC_VAR\020\000\022\017\n\013PRIVAT" +
-      "E_VAR\020\001\022\021\n\rINHERITED_VAR\020\002BG\n\037io.littleh" +
-      "orse.sdk.common.protoP\001Z\007.;model\252\002\030Littl" +
-      "eHorse.Common.Protob\006proto3"
+      "8\001\032L\n\025ParentWfSpecReference\022\024\n\014wf_spec_n" +
+      "ame\030\001 \001(\t\022\035\n\025wf_spec_major_version\030\002 \001(\005" +
+      "B\023\n\021_retention_policyB\014\n\n_migrationB\021\n\017_" +
+      "parent_wf_spec\"Q\n\027WorkflowRetentionPolic" +
+      "y\022&\n\034seconds_after_wf_termination\030\001 \001(\003H" +
+      "\000B\016\n\014wf_gc_policy\"N\n\tJsonIndex\022\022\n\nfield_" +
+      "path\030\001 \001(\t\022-\n\nfield_type\030\002 \001(\0162\031.littleh" +
+      "orse.VariableType\"B\n\025SearchableVariableD" +
+      "ef\022)\n\007var_def\030\001 \001(\0132\030.littlehorse.Variab" +
+      "leDef\"\312\001\n\014ThreadVarDef\022)\n\007var_def\030\001 \001(\0132" +
+      "\030.littlehorse.VariableDef\022\020\n\010required\030\002 " +
+      "\001(\010\022\022\n\nsearchable\030\003 \001(\010\022,\n\014json_indexes\030" +
+      "\004 \003(\0132\026.littlehorse.JsonIndex\022;\n\014access_" +
+      "level\030\005 \001(\0162%.littlehorse.WfRunVariableA" +
+      "ccessLevel\"\275\002\n\nThreadSpec\0221\n\005nodes\030\001 \003(\013" +
+      "2\".littlehorse.ThreadSpec.NodesEntry\0220\n\r" +
+      "variable_defs\030\002 \003(\0132\031.littlehorse.Thread" +
+      "VarDef\0221\n\016interrupt_defs\030\003 \003(\0132\031.littleh" +
+      "orse.InterruptDef\022A\n\020retention_policy\030\004 " +
+      "\001(\0132\".littlehorse.ThreadRetentionPolicyH" +
+      "\000\210\001\001\032?\n\nNodesEntry\022\013\n\003key\030\001 \001(\t\022 \n\005value" +
+      "\030\002 \001(\0132\021.littlehorse.Node:\0028\001B\023\n\021_retent" +
+      "ion_policy\"W\n\025ThreadRetentionPolicy\022*\n s" +
+      "econds_after_thread_termination\030\001 \001(\003H\000B" +
+      "\022\n\020thread_gc_policy\"i\n\014InterruptDef\022>\n\025e" +
+      "xternal_event_def_id\030\001 \001(\0132\037.littlehorse" +
+      ".ExternalEventDefId\022\031\n\021handler_spec_name" +
+      "\030\002 \001(\t\"\276\001\n\017StartThreadNode\022\030\n\020thread_spe" +
+      "c_name\030\001 \001(\t\022>\n\tvariables\030\002 \003(\0132+.little" +
+      "horse.StartThreadNode.VariablesEntry\032Q\n\016" +
+      "VariablesEntry\022\013\n\003key\030\001 \001(\t\022.\n\005value\030\002 \001" +
+      "(\0132\037.littlehorse.VariableAssignment:\0028\001\"" +
+      "\203\002\n\030StartMultipleThreadsNode\022\030\n\020thread_s" +
+      "pec_name\030\001 \001(\t\022G\n\tvariables\030\002 \003(\01324.litt" +
+      "lehorse.StartMultipleThreadsNode.Variabl" +
+      "esEntry\0221\n\010iterable\030\003 \001(\0132\037.littlehorse." +
+      "VariableAssignment\032Q\n\016VariablesEntry\022\013\n\003" +
+      "key\030\001 \001(\t\022.\n\005value\030\002 \001(\0132\037.littlehorse.V" +
+      "ariableAssignment:\0028\001\"\360\001\n\021FailureHandler" +
+      "Def\022\031\n\021handler_spec_name\030\002 \001(\t\022\032\n\020specif" +
+      "ic_failure\030\001 \001(\tH\000\022K\n\023any_failure_of_typ" +
+      "e\030\003 \001(\0162,.littlehorse.FailureHandlerDef." +
+      "LHFailureTypeH\000\"C\n\rLHFailureType\022\026\n\022FAIL" +
+      "URE_TYPE_ERROR\020\000\022\032\n\026FAILURE_TYPE_EXCEPTI" +
+      "ON\020\001B\022\n\020failure_to_catch\"\243\002\n\022WaitForThre" +
+      "adsNode\022@\n\007threads\030\001 \003(\0132/.littlehorse.W" +
+      "aitForThreadsNode.ThreadToWaitFor\0229\n\013thr" +
+      "ead_list\030\003 \001(\0132\037.littlehorse.VariableAss" +
+      "ignmentH\000\210\001\001\0221\n\006policy\030\002 \001(\0162!.littlehor" +
+      "se.WaitForThreadsPolicy\032M\n\017ThreadToWaitF" +
+      "or\022:\n\021thread_run_number\030\001 \001(\0132\037.littleho" +
+      "rse.VariableAssignmentB\016\n\014_thread_list\"\215" +
+      "\001\n\021ExternalEventNode\022>\n\025external_event_d" +
+      "ef_id\030\001 \001(\0132\037.littlehorse.ExternalEventD" +
+      "efId\0228\n\017timeout_seconds\030\002 \001(\0132\037.littleho" +
+      "rse.VariableAssignment\"\020\n\016EntrypointNode" +
+      "\"M\n\010ExitNode\0221\n\013failure_def\030\001 \001(\0132\027.litt" +
+      "lehorse.FailureDefH\000\210\001\001B\016\n\014_failure_def\"" +
+      "v\n\nFailureDef\022\024\n\014failure_name\030\001 \001(\t\022\017\n\007m" +
+      "essage\030\002 \001(\t\0225\n\007content\030\003 \001(\0132\037.littleho" +
+      "rse.VariableAssignmentH\000\210\001\001B\n\n\010_content\"" +
+      "\350\004\n\004Node\022)\n\016outgoing_edges\030\001 \003(\0132\021.littl" +
+      "ehorse.Edge\0228\n\020failure_handlers\030\004 \003(\0132\036." +
+      "littlehorse.FailureHandlerDef\0221\n\nentrypo" +
+      "int\030\005 \001(\0132\033.littlehorse.EntrypointNodeH\000" +
+      "\022%\n\004exit\030\006 \001(\0132\025.littlehorse.ExitNodeH\000\022" +
+      "%\n\004task\030\007 \001(\0132\025.littlehorse.TaskNodeH\000\0228" +
+      "\n\016external_event\030\010 \001(\0132\036.littlehorse.Ext" +
+      "ernalEventNodeH\000\0224\n\014start_thread\030\t \001(\0132\034" +
+      ".littlehorse.StartThreadNodeH\000\022;\n\020wait_f" +
+      "or_threads\030\n \001(\0132\037.littlehorse.WaitForTh" +
+      "readsNodeH\000\022#\n\003nop\030\013 \001(\0132\024.littlehorse.N" +
+      "opNodeH\000\022\'\n\005sleep\030\014 \001(\0132\026.littlehorse.Sl" +
+      "eepNodeH\000\022.\n\tuser_task\030\r \001(\0132\031.littlehor" +
+      "se.UserTaskNodeH\000\022G\n\026start_multiple_thre" +
+      "ads\030\017 \001(\0132%.littlehorse.StartMultipleThr" +
+      "eadsNodeH\000B\006\n\004node\"\342\002\n\014UserTaskNode\022\032\n\022u" +
+      "ser_task_def_name\030\001 \001(\t\0228\n\nuser_group\030\002 " +
+      "\001(\0132\037.littlehorse.VariableAssignmentH\000\210\001" +
+      "\001\0225\n\007user_id\030\003 \001(\0132\037.littlehorse.Variabl" +
+      "eAssignmentH\001\210\001\001\022-\n\007actions\030\004 \003(\0132\034.litt" +
+      "lehorse.UTActionTrigger\022\"\n\025user_task_def" +
+      "_version\030\005 \001(\005H\002\210\001\001\0223\n\005notes\030\006 \001(\0132\037.lit" +
+      "tlehorse.VariableAssignmentH\003\210\001\001B\r\n\013_use" +
+      "r_groupB\n\n\010_user_idB\030\n\026_user_task_def_ve" +
+      "rsionB\010\n\006_notes\"\233\001\n\rEdgeCondition\022+\n\ncom" +
+      "parator\030\001 \001(\0162\027.littlehorse.Comparator\022-" +
+      "\n\004left\030\002 \001(\0132\037.littlehorse.VariableAssig" +
+      "nment\022.\n\005right\030\003 \001(\0132\037.littlehorse.Varia" +
+      "bleAssignment\"\233\001\n\004Edge\022\026\n\016sink_node_name" +
+      "\030\001 \001(\t\0222\n\tcondition\030\002 \001(\0132\032.littlehorse." +
+      "EdgeConditionH\000\210\001\001\0229\n\022variable_mutations" +
+      "\030\003 \003(\0132\035.littlehorse.VariableMutationB\014\n" +
+      "\n_condition\"\t\n\007NopNode\"\276\001\n\tSleepNode\0226\n\013" +
+      "raw_seconds\030\001 \001(\0132\037.littlehorse.Variable" +
+      "AssignmentH\000\0224\n\ttimestamp\030\002 \001(\0132\037.little" +
+      "horse.VariableAssignmentH\000\0223\n\010iso_date\030\003" +
+      " \001(\0132\037.littlehorse.VariableAssignmentH\000B" +
+      "\016\n\014sleep_length\"\207\002\n\026WfSpecVersionMigrati" +
+      "on\022\031\n\021new_major_version\030\001 \001(\005\022\024\n\014new_rev" +
+      "ision\030\002 \001(\005\022]\n\026thread_spec_migrations\030\003 " +
+      "\003(\0132=.littlehorse.WfSpecVersionMigration" +
+      ".ThreadSpecMigrationsEntry\032]\n\031ThreadSpec" +
+      "MigrationsEntry\022\013\n\003key\030\001 \001(\t\022/\n\005value\030\002 " +
+      "\001(\0132 .littlehorse.ThreadSpecMigration:\0028" +
+      "\001\"\325\001\n\023ThreadSpecMigration\022\034\n\024new_thread_" +
+      "spec_name\030\001 \001(\t\022M\n\017node_migrations\030\002 \003(\013" +
+      "24.littlehorse.ThreadSpecMigration.NodeM" +
+      "igrationsEntry\032Q\n\023NodeMigrationsEntry\022\013\n" +
+      "\003key\030\001 \001(\t\022)\n\005value\030\002 \001(\0132\032.littlehorse." +
+      "NodeMigration:\0028\001\"&\n\rNodeMigration\022\025\n\rne" +
+      "w_node_name\030\001 \001(\t*N\n\030WfRunVariableAccess" +
+      "Level\022\016\n\nPUBLIC_VAR\020\000\022\017\n\013PRIVATE_VAR\020\001\022\021" +
+      "\n\rINHERITED_VAR\020\002BG\n\037io.littlehorse.sdk." +
+      "common.protoP\001Z\007.;model\252\002\030LittleHorse.Co" +
+      "mmon.Protob\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
@@ -346,7 +347,7 @@ public static void registerAllExtensions(
     internal_static_littlehorse_WfSpec_ParentWfSpecReference_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_littlehorse_WfSpec_ParentWfSpecReference_descriptor,
-        new java.lang.String[] { "WfSpecName", });
+        new java.lang.String[] { "WfSpecName", "WfSpecMajorVersion", });
     internal_static_littlehorse_WorkflowRetentionPolicy_descriptor =
       getDescriptor().getMessageTypes().get(1);
     internal_static_littlehorse_WorkflowRetentionPolicy_fieldAccessorTable = new
diff --git a/sdk-python/littlehorse/model/wf_spec_pb2.py b/sdk-python/littlehorse/model/wf_spec_pb2.py
index fd426cb35..ee86772dd 100644
--- a/sdk-python/littlehorse/model/wf_spec_pb2.py
+++ b/sdk-python/littlehorse/model/wf_spec_pb2.py
@@ -17,7 +17,7 @@
 import littlehorse.model.object_id_pb2 as object__id__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\rwf_spec.proto\x12\x0blittlehorse\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x12\x63ommon_enums.proto\x1a\x13\x63ommon_wfspec.proto\x1a\x0fobject_id.proto\"\x95\x05\n\x06WfSpec\x12!\n\x02id\x18\x01 \x01(\x0b\x32\x15.littlehorse.WfSpecId\x12.\n\ncreated_at\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x33\n\x10\x66rozen_variables\x18\x03 \x03(\x0b\x32\x19.littlehorse.ThreadVarDef\x12+\n\x06status\x18\x04 \x01(\x0e\x32\x1b.littlehorse.MetadataStatus\x12:\n\x0cthread_specs\x18\x05 \x03(\x0b\x32$.littlehorse.WfSpec.ThreadSpecsEntry\x12\x1e\n\x16\x65ntrypoint_thread_name\x18\x06 \x01(\t\x12\x43\n\x10retention_policy\x18\x07 \x01(\x0b\x32$.littlehorse.WorkflowRetentionPolicyH\x00\x88\x01\x01\x12;\n\tmigration\x18\x08 \x01(\x0b\x32#.littlehorse.WfSpecVersionMigrationH\x01\x88\x01\x01\x12\x46\n\x0eparent_wf_spec\x18\t \x01(\x0b\x32).littlehorse.WfSpec.ParentWfSpecReferenceH\x02\x88\x01\x01\x1aK\n\x10ThreadSpecsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12&\n\x05value\x18\x02 \x01(\x0b\x32\x17.littlehorse.ThreadSpec:\x02\x38\x01\x1a-\n\x15ParentWfSpecReference\x12\x14\n\x0cwf_spec_name\x18\x01 \x01(\tB\x13\n\x11_retention_policyB\x0c\n\n_migrationB\x11\n\x0f_parent_wf_spec\"Q\n\x17WorkflowRetentionPolicy\x12&\n\x1cseconds_after_wf_termination\x18\x01 \x01(\x03H\x00\x42\x0e\n\x0cwf_gc_policy\"N\n\tJsonIndex\x12\x12\n\nfield_path\x18\x01 \x01(\t\x12-\n\nfield_type\x18\x02 \x01(\x0e\x32\x19.littlehorse.VariableType\"B\n\x15SearchableVariableDef\x12)\n\x07var_def\x18\x01 \x01(\x0b\x32\x18.littlehorse.VariableDef\"\xca\x01\n\x0cThreadVarDef\x12)\n\x07var_def\x18\x01 \x01(\x0b\x32\x18.littlehorse.VariableDef\x12\x10\n\x08required\x18\x02 \x01(\x08\x12\x12\n\nsearchable\x18\x03 \x01(\x08\x12,\n\x0cjson_indexes\x18\x04 \x03(\x0b\x32\x16.littlehorse.JsonIndex\x12;\n\x0c\x61\x63\x63\x65ss_level\x18\x05 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+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\rwf_spec.proto\x12\x0blittlehorse\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x12\x63ommon_enums.proto\x1a\x13\x63ommon_wfspec.proto\x1a\x0fobject_id.proto\"\xb4\x05\n\x06WfSpec\x12!\n\x02id\x18\x01 \x01(\x0b\x32\x15.littlehorse.WfSpecId\x12.\n\ncreated_at\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x33\n\x10\x66rozen_variables\x18\x03 \x03(\x0b\x32\x19.littlehorse.ThreadVarDef\x12+\n\x06status\x18\x04 \x01(\x0e\x32\x1b.littlehorse.MetadataStatus\x12:\n\x0cthread_specs\x18\x05 \x03(\x0b\x32$.littlehorse.WfSpec.ThreadSpecsEntry\x12\x1e\n\x16\x65ntrypoint_thread_name\x18\x06 \x01(\t\x12\x43\n\x10retention_policy\x18\x07 \x01(\x0b\x32$.littlehorse.WorkflowRetentionPolicyH\x00\x88\x01\x01\x12;\n\tmigration\x18\x08 \x01(\x0b\x32#.littlehorse.WfSpecVersionMigrationH\x01\x88\x01\x01\x12\x46\n\x0eparent_wf_spec\x18\t 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\x01(\x0b\x32\x17.littlehorse.FailureDefH\x00\x88\x01\x01\x42\x0e\n\x0c_failure_def\"v\n\nFailureDef\x12\x14\n\x0c\x66\x61ilure_name\x18\x01 \x01(\t\x12\x0f\n\x07message\x18\x02 \x01(\t\x12\x35\n\x07\x63ontent\x18\x03 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x00\x88\x01\x01\x42\n\n\x08_content\"\xe8\x04\n\x04Node\x12)\n\x0eoutgoing_edges\x18\x01 \x03(\x0b\x32\x11.littlehorse.Edge\x12\x38\n\x10\x66\x61ilure_handlers\x18\x04 \x03(\x0b\x32\x1e.littlehorse.FailureHandlerDef\x12\x31\n\nentrypoint\x18\x05 \x01(\x0b\x32\x1b.littlehorse.EntrypointNodeH\x00\x12%\n\x04\x65xit\x18\x06 \x01(\x0b\x32\x15.littlehorse.ExitNodeH\x00\x12%\n\x04task\x18\x07 \x01(\x0b\x32\x15.littlehorse.TaskNodeH\x00\x12\x38\n\x0e\x65xternal_event\x18\x08 \x01(\x0b\x32\x1e.littlehorse.ExternalEventNodeH\x00\x12\x34\n\x0cstart_thread\x18\t \x01(\x0b\x32\x1c.littlehorse.StartThreadNodeH\x00\x12;\n\x10wait_for_threads\x18\n \x01(\x0b\x32\x1f.littlehorse.WaitForThreadsNodeH\x00\x12#\n\x03nop\x18\x0b \x01(\x0b\x32\x14.littlehorse.NopNodeH\x00\x12\'\n\x05sleep\x18\x0c \x01(\x0b\x32\x16.littlehorse.SleepNodeH\x00\x12.\n\tuser_task\x18\r \x01(\x0b\x32\x19.littlehorse.UserTaskNodeH\x00\x12G\n\x16start_multiple_threads\x18\x0f \x01(\x0b\x32%.littlehorse.StartMultipleThreadsNodeH\x00\x42\x06\n\x04node\"\xe2\x02\n\x0cUserTaskNode\x12\x1a\n\x12user_task_def_name\x18\x01 \x01(\t\x12\x38\n\nuser_group\x18\x02 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x00\x88\x01\x01\x12\x35\n\x07user_id\x18\x03 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x01\x88\x01\x01\x12-\n\x07\x61\x63tions\x18\x04 \x03(\x0b\x32\x1c.littlehorse.UTActionTrigger\x12\"\n\x15user_task_def_version\x18\x05 \x01(\x05H\x02\x88\x01\x01\x12\x33\n\x05notes\x18\x06 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x03\x88\x01\x01\x42\r\n\x0b_user_groupB\n\n\x08_user_idB\x18\n\x16_user_task_def_versionB\x08\n\x06_notes\"\x9b\x01\n\rEdgeCondition\x12+\n\ncomparator\x18\x01 \x01(\x0e\x32\x17.littlehorse.Comparator\x12-\n\x04left\x18\x02 \x01(\x0b\x32\x1f.littlehorse.VariableAssignment\x12.\n\x05right\x18\x03 \x01(\x0b\x32\x1f.littlehorse.VariableAssignment\"\x9b\x01\n\x04\x45\x64ge\x12\x16\n\x0esink_node_name\x18\x01 \x01(\t\x12\x32\n\tcondition\x18\x02 \x01(\x0b\x32\x1a.littlehorse.EdgeConditionH\x00\x88\x01\x01\x12\x39\n\x12variable_mutations\x18\x03 \x03(\x0b\x32\x1d.littlehorse.VariableMutationB\x0c\n\n_condition\"\t\n\x07NopNode\"\xbe\x01\n\tSleepNode\x12\x36\n\x0braw_seconds\x18\x01 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x00\x12\x34\n\ttimestamp\x18\x02 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x00\x12\x33\n\x08iso_date\x18\x03 \x01(\x0b\x32\x1f.littlehorse.VariableAssignmentH\x00\x42\x0e\n\x0csleep_length\"\x87\x02\n\x16WfSpecVersionMigration\x12\x19\n\x11new_major_version\x18\x01 \x01(\x05\x12\x14\n\x0cnew_revision\x18\x02 \x01(\x05\x12]\n\x16thread_spec_migrations\x18\x03 \x03(\x0b\x32=.littlehorse.WfSpecVersionMigration.ThreadSpecMigrationsEntry\x1a]\n\x19ThreadSpecMigrationsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12/\n\x05value\x18\x02 \x01(\x0b\x32 .littlehorse.ThreadSpecMigration:\x02\x38\x01\"\xd5\x01\n\x13ThreadSpecMigration\x12\x1c\n\x14new_thread_spec_name\x18\x01 \x01(\t\x12M\n\x0fnode_migrations\x18\x02 \x03(\x0b\x32\x34.littlehorse.ThreadSpecMigration.NodeMigrationsEntry\x1aQ\n\x13NodeMigrationsEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12)\n\x05value\x18\x02 \x01(\x0b\x32\x1a.littlehorse.NodeMigration:\x02\x38\x01\"&\n\rNodeMigration\x12\x15\n\rnew_node_name\x18\x01 \x01(\t*N\n\x18WfRunVariableAccessLevel\x12\x0e\n\nPUBLIC_VAR\x10\x00\x12\x0f\n\x0bPRIVATE_VAR\x10\x01\x12\x11\n\rINHERITED_VAR\x10\x02\x42G\n\x1fio.littlehorse.sdk.common.protoP\x01Z\x07.;model\xaa\x02\x18LittleHorse.Common.Protob\x06proto3')
 
 _globals = globals()
 _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
@@ -38,74 +38,74 @@
   _WFSPECVERSIONMIGRATION_THREADSPECMIGRATIONSENTRY._serialized_options = b'8\001'
   _THREADSPECMIGRATION_NODEMIGRATIONSENTRY._options = None
   _THREADSPECMIGRATION_NODEMIGRATIONSENTRY._serialized_options = b'8\001'
-  _globals['_WFRUNVARIABLEACCESSLEVEL']._serialized_start=5108
-  _globals['_WFRUNVARIABLEACCESSLEVEL']._serialized_end=5186
+  _globals['_WFRUNVARIABLEACCESSLEVEL']._serialized_start=5139
+  _globals['_WFRUNVARIABLEACCESSLEVEL']._serialized_end=5217
   _globals['_WFSPEC']._serialized_start=122
-  _globals['_WFSPEC']._serialized_end=783
+  _globals['_WFSPEC']._serialized_end=814
   _globals['_WFSPEC_THREADSPECSENTRY']._serialized_start=607
   _globals['_WFSPEC_THREADSPECSENTRY']._serialized_end=682
   _globals['_WFSPEC_PARENTWFSPECREFERENCE']._serialized_start=684
-  _globals['_WFSPEC_PARENTWFSPECREFERENCE']._serialized_end=729
-  _globals['_WORKFLOWRETENTIONPOLICY']._serialized_start=785
-  _globals['_WORKFLOWRETENTIONPOLICY']._serialized_end=866
-  _globals['_JSONINDEX']._serialized_start=868
-  _globals['_JSONINDEX']._serialized_end=946
-  _globals['_SEARCHABLEVARIABLEDEF']._serialized_start=948
-  _globals['_SEARCHABLEVARIABLEDEF']._serialized_end=1014
-  _globals['_THREADVARDEF']._serialized_start=1017
-  _globals['_THREADVARDEF']._serialized_end=1219
-  _globals['_THREADSPEC']._serialized_start=1222
-  _globals['_THREADSPEC']._serialized_end=1539
-  _globals['_THREADSPEC_NODESENTRY']._serialized_start=1455
-  _globals['_THREADSPEC_NODESENTRY']._serialized_end=1518
-  _globals['_THREADRETENTIONPOLICY']._serialized_start=1541
-  _globals['_THREADRETENTIONPOLICY']._serialized_end=1628
-  _globals['_INTERRUPTDEF']._serialized_start=1630
-  _globals['_INTERRUPTDEF']._serialized_end=1735
-  _globals['_STARTTHREADNODE']._serialized_start=1738
-  _globals['_STARTTHREADNODE']._serialized_end=1928
-  _globals['_STARTTHREADNODE_VARIABLESENTRY']._serialized_start=1847
-  _globals['_STARTTHREADNODE_VARIABLESENTRY']._serialized_end=1928
-  _globals['_STARTMULTIPLETHREADSNODE']._serialized_start=1931
-  _globals['_STARTMULTIPLETHREADSNODE']._serialized_end=2190
-  _globals['_STARTMULTIPLETHREADSNODE_VARIABLESENTRY']._serialized_start=1847
-  _globals['_STARTMULTIPLETHREADSNODE_VARIABLESENTRY']._serialized_end=1928
-  _globals['_FAILUREHANDLERDEF']._serialized_start=2193
-  _globals['_FAILUREHANDLERDEF']._serialized_end=2433
-  _globals['_FAILUREHANDLERDEF_LHFAILURETYPE']._serialized_start=2346
-  _globals['_FAILUREHANDLERDEF_LHFAILURETYPE']._serialized_end=2413
-  _globals['_WAITFORTHREADSNODE']._serialized_start=2436
-  _globals['_WAITFORTHREADSNODE']._serialized_end=2727
-  _globals['_WAITFORTHREADSNODE_THREADTOWAITFOR']._serialized_start=2634
-  _globals['_WAITFORTHREADSNODE_THREADTOWAITFOR']._serialized_end=2711
-  _globals['_EXTERNALEVENTNODE']._serialized_start=2730
-  _globals['_EXTERNALEVENTNODE']._serialized_end=2871
-  _globals['_ENTRYPOINTNODE']._serialized_start=2873
-  _globals['_ENTRYPOINTNODE']._serialized_end=2889
-  _globals['_EXITNODE']._serialized_start=2891
-  _globals['_EXITNODE']._serialized_end=2968
-  _globals['_FAILUREDEF']._serialized_start=2970
-  _globals['_FAILUREDEF']._serialized_end=3088
-  _globals['_NODE']._serialized_start=3091
-  _globals['_NODE']._serialized_end=3707
-  _globals['_USERTASKNODE']._serialized_start=3710
-  _globals['_USERTASKNODE']._serialized_end=4064
-  _globals['_EDGECONDITION']._serialized_start=4067
-  _globals['_EDGECONDITION']._serialized_end=4222
-  _globals['_EDGE']._serialized_start=4225
-  _globals['_EDGE']._serialized_end=4380
-  _globals['_NOPNODE']._serialized_start=4382
-  _globals['_NOPNODE']._serialized_end=4391
-  _globals['_SLEEPNODE']._serialized_start=4394
-  _globals['_SLEEPNODE']._serialized_end=4584
-  _globals['_WFSPECVERSIONMIGRATION']._serialized_start=4587
-  _globals['_WFSPECVERSIONMIGRATION']._serialized_end=4850
-  _globals['_WFSPECVERSIONMIGRATION_THREADSPECMIGRATIONSENTRY']._serialized_start=4757
-  _globals['_WFSPECVERSIONMIGRATION_THREADSPECMIGRATIONSENTRY']._serialized_end=4850
-  _globals['_THREADSPECMIGRATION']._serialized_start=4853
-  _globals['_THREADSPECMIGRATION']._serialized_end=5066
-  _globals['_THREADSPECMIGRATION_NODEMIGRATIONSENTRY']._serialized_start=4985
-  _globals['_THREADSPECMIGRATION_NODEMIGRATIONSENTRY']._serialized_end=5066
-  _globals['_NODEMIGRATION']._serialized_start=5068
-  _globals['_NODEMIGRATION']._serialized_end=5106
+  _globals['_WFSPEC_PARENTWFSPECREFERENCE']._serialized_end=760
+  _globals['_WORKFLOWRETENTIONPOLICY']._serialized_start=816
+  _globals['_WORKFLOWRETENTIONPOLICY']._serialized_end=897
+  _globals['_JSONINDEX']._serialized_start=899
+  _globals['_JSONINDEX']._serialized_end=977
+  _globals['_SEARCHABLEVARIABLEDEF']._serialized_start=979
+  _globals['_SEARCHABLEVARIABLEDEF']._serialized_end=1045
+  _globals['_THREADVARDEF']._serialized_start=1048
+  _globals['_THREADVARDEF']._serialized_end=1250
+  _globals['_THREADSPEC']._serialized_start=1253
+  _globals['_THREADSPEC']._serialized_end=1570
+  _globals['_THREADSPEC_NODESENTRY']._serialized_start=1486
+  _globals['_THREADSPEC_NODESENTRY']._serialized_end=1549
+  _globals['_THREADRETENTIONPOLICY']._serialized_start=1572
+  _globals['_THREADRETENTIONPOLICY']._serialized_end=1659
+  _globals['_INTERRUPTDEF']._serialized_start=1661
+  _globals['_INTERRUPTDEF']._serialized_end=1766
+  _globals['_STARTTHREADNODE']._serialized_start=1769
+  _globals['_STARTTHREADNODE']._serialized_end=1959
+  _globals['_STARTTHREADNODE_VARIABLESENTRY']._serialized_start=1878
+  _globals['_STARTTHREADNODE_VARIABLESENTRY']._serialized_end=1959
+  _globals['_STARTMULTIPLETHREADSNODE']._serialized_start=1962
+  _globals['_STARTMULTIPLETHREADSNODE']._serialized_end=2221
+  _globals['_STARTMULTIPLETHREADSNODE_VARIABLESENTRY']._serialized_start=1878
+  _globals['_STARTMULTIPLETHREADSNODE_VARIABLESENTRY']._serialized_end=1959
+  _globals['_FAILUREHANDLERDEF']._serialized_start=2224
+  _globals['_FAILUREHANDLERDEF']._serialized_end=2464
+  _globals['_FAILUREHANDLERDEF_LHFAILURETYPE']._serialized_start=2377
+  _globals['_FAILUREHANDLERDEF_LHFAILURETYPE']._serialized_end=2444
+  _globals['_WAITFORTHREADSNODE']._serialized_start=2467
+  _globals['_WAITFORTHREADSNODE']._serialized_end=2758
+  _globals['_WAITFORTHREADSNODE_THREADTOWAITFOR']._serialized_start=2665
+  _globals['_WAITFORTHREADSNODE_THREADTOWAITFOR']._serialized_end=2742
+  _globals['_EXTERNALEVENTNODE']._serialized_start=2761
+  _globals['_EXTERNALEVENTNODE']._serialized_end=2902
+  _globals['_ENTRYPOINTNODE']._serialized_start=2904
+  _globals['_ENTRYPOINTNODE']._serialized_end=2920
+  _globals['_EXITNODE']._serialized_start=2922
+  _globals['_EXITNODE']._serialized_end=2999
+  _globals['_FAILUREDEF']._serialized_start=3001
+  _globals['_FAILUREDEF']._serialized_end=3119
+  _globals['_NODE']._serialized_start=3122
+  _globals['_NODE']._serialized_end=3738
+  _globals['_USERTASKNODE']._serialized_start=3741
+  _globals['_USERTASKNODE']._serialized_end=4095
+  _globals['_EDGECONDITION']._serialized_start=4098
+  _globals['_EDGECONDITION']._serialized_end=4253
+  _globals['_EDGE']._serialized_start=4256
+  _globals['_EDGE']._serialized_end=4411
+  _globals['_NOPNODE']._serialized_start=4413
+  _globals['_NOPNODE']._serialized_end=4422
+  _globals['_SLEEPNODE']._serialized_start=4425
+  _globals['_SLEEPNODE']._serialized_end=4615
+  _globals['_WFSPECVERSIONMIGRATION']._serialized_start=4618
+  _globals['_WFSPECVERSIONMIGRATION']._serialized_end=4881
+  _globals['_WFSPECVERSIONMIGRATION_THREADSPECMIGRATIONSENTRY']._serialized_start=4788
+  _globals['_WFSPECVERSIONMIGRATION_THREADSPECMIGRATIONSENTRY']._serialized_end=4881
+  _globals['_THREADSPECMIGRATION']._serialized_start=4884
+  _globals['_THREADSPECMIGRATION']._serialized_end=5097
+  _globals['_THREADSPECMIGRATION_NODEMIGRATIONSENTRY']._serialized_start=5016
+  _globals['_THREADSPECMIGRATION_NODEMIGRATIONSENTRY']._serialized_end=5097
+  _globals['_NODEMIGRATION']._serialized_start=5099
+  _globals['_NODEMIGRATION']._serialized_end=5137
 # @@protoc_insertion_point(module_scope)
diff --git a/sdk-python/littlehorse/model/wf_spec_pb2.pyi b/sdk-python/littlehorse/model/wf_spec_pb2.pyi
index efc67bae2..6bf17c51d 100644
--- a/sdk-python/littlehorse/model/wf_spec_pb2.pyi
+++ b/sdk-python/littlehorse/model/wf_spec_pb2.pyi
@@ -29,10 +29,12 @@ class WfSpec(_message.Message):
         value: ThreadSpec
         def __init__(self, key: _Optional[str] = ..., value: _Optional[_Union[ThreadSpec, _Mapping]] = ...) -> None: ...
     class ParentWfSpecReference(_message.Message):
-        __slots__ = ["wf_spec_name"]
+        __slots__ = ["wf_spec_name", "wf_spec_major_version"]
         WF_SPEC_NAME_FIELD_NUMBER: _ClassVar[int]
+        WF_SPEC_MAJOR_VERSION_FIELD_NUMBER: _ClassVar[int]
         wf_spec_name: str
-        def __init__(self, wf_spec_name: _Optional[str] = ...) -> None: ...
+        wf_spec_major_version: int
+        def __init__(self, wf_spec_name: _Optional[str] = ..., wf_spec_major_version: _Optional[int] = ...) -> None: ...
     ID_FIELD_NUMBER: _ClassVar[int]
     CREATED_AT_FIELD_NUMBER: _ClassVar[int]
     FROZEN_VARIABLES_FIELD_NUMBER: _ClassVar[int]
diff --git a/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/ParentWfSpecReferenceModel.java b/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/ParentWfSpecReferenceModel.java
index e570259d2..1f20a5815 100644
--- a/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/ParentWfSpecReferenceModel.java
+++ b/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/ParentWfSpecReferenceModel.java
@@ -10,6 +10,12 @@
 public class ParentWfSpecReferenceModel extends LHSerializable<ParentWfSpecReference> {
 
     private String wfSpecName;
+    private int wfSpecMajorVersion;
+
+    public ParentWfSpecReferenceModel(String wfSpecName, int wfSpecMajorVersion) {
+        this.wfSpecName = wfSpecName;
+        this.wfSpecMajorVersion = wfSpecMajorVersion;
+    }
 
     @Override
     public Class<ParentWfSpecReference> getProtoBaseClass() {
@@ -18,7 +24,9 @@ public Class<ParentWfSpecReference> getProtoBaseClass() {
 
     @Override
     public ParentWfSpecReference.Builder toProto() {
-        ParentWfSpecReference.Builder out = ParentWfSpecReference.newBuilder().setWfSpecName(wfSpecName);
+        ParentWfSpecReference.Builder out = ParentWfSpecReference.newBuilder()
+                .setWfSpecName(wfSpecName)
+                .setWfSpecMajorVersion(wfSpecMajorVersion);
         return out;
     }
 
@@ -26,5 +34,6 @@ public ParentWfSpecReference.Builder toProto() {
     public void initFrom(Message proto, ExecutionContext ctx) {
         ParentWfSpecReference p = (ParentWfSpecReference) proto;
         wfSpecName = p.getWfSpecName();
+        wfSpecMajorVersion = p.getWfSpecMajorVersion();
     }
 }
diff --git a/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModel.java b/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModel.java
index 86f163d22..b75527c01 100644
--- a/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModel.java
+++ b/server/src/main/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModel.java
@@ -24,6 +24,7 @@
 import io.littlehorse.sdk.common.proto.ThreadSpec;
 import io.littlehorse.sdk.common.proto.ThreadType;
 import io.littlehorse.sdk.common.proto.ThreadVarDef;
+import io.littlehorse.sdk.common.proto.WfRunVariableAccessLevel;
 import io.littlehorse.sdk.common.proto.WfSpec;
 import io.littlehorse.sdk.common.proto.WfSpecId;
 import io.littlehorse.server.streams.storeinternals.GetableIndex;
@@ -225,7 +226,7 @@ public void validateAndMaybeBumpVersion(Optional<WfSpecModel> oldVersion, Metada
             throw new LHApiException(Status.INVALID_ARGUMENT, "Unknown entrypoint thread");
         }
 
-        validateVariablesHelper();
+        validateVariablesHelper(ctx);
 
         for (Map.Entry<String, ThreadSpecModel> e : threadSpecs.entrySet()) {
             ThreadSpecModel ts = e.getValue();
@@ -241,10 +242,17 @@ public void validateAndMaybeBumpVersion(Optional<WfSpecModel> oldVersion, Metada
         }
 
         if (parentWfSpec != null) {
-            validateParentHelper(ctx);
+            getParentWfSpec(ctx);
         }
     }
 
+    /**
+     * Returns entrypoint thread instance
+     */
+    public ThreadSpecModel getEntrypointThread(){
+        return threadSpecs.get(entrypointThreadName);
+    }
+
     /**
      * Returns a Map from Variable Name to ThreadVarDefModel. Excludes the reserved "INPUT"
      * variable.
@@ -297,14 +305,34 @@ public Map<String, ThreadVarDefModel> getRequiredVariables() {
      * 2. Validating variable types for mutations, assignments, and task input.
      * 3. Incorporation of JsonSchema or Protobuf Schema for further validation.
      */
-    private void validateVariablesHelper() throws LHApiException {
+    private void validateVariablesHelper(MetadataCommandExecution ctx) throws LHApiException {
         varToThreadSpec = new HashMap<>();
+        boolean hasParentWorkflow = parentWfSpec != null;
+        WfSpecModel parentWfSpec = null;
+        if (hasParentWorkflow) {
+            parentWfSpec = getParentWfSpec(ctx);
+        }
         for (ThreadSpecModel tspec : threadSpecs.values()) {
             // for (Map.Entry<String, VariableDef> e : tspec.variableDefs.entrySet()) {
             for (ThreadVarDefModel tvd : tspec.getVariableDefs()) {
                 VariableDefModel vd = tvd.getVarDef();
                 String varName = vd.getName();
-
+                if (tvd.getAccessLevel().equals(WfRunVariableAccessLevel.INHERITED_VAR) && !hasParentWorkflow) {
+                    throw new LHApiException(
+                            Status.INVALID_ARGUMENT, "Only child workflows are allowed to access inherited variables");
+                } else if (tvd.getAccessLevel().equals(WfRunVariableAccessLevel.INHERITED_VAR)) {
+                    ThreadVarDefModel parentVariable =
+                            parentWfSpec.getAllVariables().get(varName);
+                    if (parentVariable == null) {
+                        throw new LHApiException(
+                                Status.INVALID_ARGUMENT,
+                                "Inherited variable %s does not exist in parent WfSpec".formatted(varName));
+                    } else if (parentVariable.getAccessLevel().equals(WfRunVariableAccessLevel.PRIVATE_VAR)) {
+                        throw new LHApiException(
+                                Status.INVALID_ARGUMENT,
+                                "Inherited variable %s is defined as PRIVATE in parent WfSpec".formatted(varName));
+                    }
+                }
                 if (varToThreadSpec.containsKey(varName)) {
                     if (!varName.equals(LHConstants.EXT_EVT_HANDLER_VAR)) {
                         throw new LHApiException(
@@ -405,13 +433,14 @@ public WfRunModel startNewRun(RunWfRequestModel evt, ProcessorExecutionContext p
      * checking of variables, though. That is a future feature we will add in 1.0
      * or 1.1
      */
-    private void validateParentHelper(MetadataCommandExecution ctx) {
-        WfSpecModel parent = ctx.service().getWfSpec(parentWfSpec.getWfSpecName(), null, null);
+    private WfSpecModel getParentWfSpec(MetadataCommandExecution ctx) {
+        WfSpecModel parent = ctx.service().getWfSpec(parentWfSpec.getWfSpecName(), parentWfSpec.getWfSpecMajorVersion(), 0);
         if (parent == null) {
             throw new LHApiException(
                     Status.INVALID_ARGUMENT,
                     "Provided spec refers to nonexistent parent wfSpec %s".formatted(parentWfSpec.getWfSpecName()));
         }
+        return parent;
     }
 
     public static WfSpecId parseId(String fullId) {
diff --git a/server/src/main/java/io/littlehorse/common/util/WfSpecUtil.java b/server/src/main/java/io/littlehorse/common/util/WfSpecUtil.java
index ae6baebee..8d9baf9ac 100644
--- a/server/src/main/java/io/littlehorse/common/util/WfSpecUtil.java
+++ b/server/src/main/java/io/littlehorse/common/util/WfSpecUtil.java
@@ -3,12 +3,16 @@
 import com.google.protobuf.Timestamp;
 import io.littlehorse.common.model.getable.global.wfspec.WfSpecModel;
 import io.littlehorse.common.model.getable.global.wfspec.thread.ThreadVarDefModel;
+import io.littlehorse.common.model.getable.global.wfspec.variable.VariableDefModel;
+import io.littlehorse.sdk.common.proto.WfRunVariableAccessLevel;
 import io.littlehorse.sdk.common.proto.WfSpec;
 import io.littlehorse.sdk.common.proto.WfSpecId;
 import java.util.Arrays;
 import java.util.Date;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 
 public class WfSpecUtil {
     private WfSpecUtil() {}
@@ -54,4 +58,14 @@ private static boolean variablesMatch(Map<String, ThreadVarDefModel> left, Map<S
 
         return leftVariables.containsAll(rightVariables);
     }
+
+    /*private static boolean variableAccessLevelMatch(List<ThreadVarDefModel> left, List<ThreadVarDefModel> right) {
+        Set<String> publicVariables = right.stream()
+                .filter(threadVarDefModel -> threadVarDefModel.getAccessLevel().equals(WfRunVariableAccessLevel.PUBLIC_VAR))
+                .map(ThreadVarDefModel::getVarDef)
+                .map(VariableDefModel::getName)
+                .collect(Collectors.toSet());
+        Set<String>
+
+    }*/
 }
diff --git a/server/src/test/java/e2e/SharedVariablesTest.java b/server/src/test/java/e2e/SharedVariablesTest.java
index 12d4e7e13..6a996e11f 100644
--- a/server/src/test/java/e2e/SharedVariablesTest.java
+++ b/server/src/test/java/e2e/SharedVariablesTest.java
@@ -53,7 +53,7 @@ public Workflow buildParentWf() {
             WfRunVariable inputNumber =
                     thread.addVariable("input-number", VariableType.INT).required();
             WfRunVariable publicVariable = thread.addVariable("public-variable", VariableType.INT)
-                    .withAccessLevel(WfRunVariableAccessLevel.PUBLIC_VAR);
+                    .withAccessLevel(WfRunVariableAccessLevel.INHERITED_VAR);
             thread.mutate(inputNumber, VariableMutationType.MULTIPLY, 2);
             thread.mutate(publicVariable, VariableMutationType.ASSIGN, inputNumber);
         });
diff --git a/server/src/test/java/io/littlehorse/TestUtil.java b/server/src/test/java/io/littlehorse/TestUtil.java
index 644b6fcda..45964e25e 100644
--- a/server/src/test/java/io/littlehorse/TestUtil.java
+++ b/server/src/test/java/io/littlehorse/TestUtil.java
@@ -156,7 +156,7 @@ public static WfSpecModel wfSpec(String name) {
         WfSpecModel spec = new WfSpecModel(Mockito.mock());
         spec.setId(new WfSpecIdModel(name, 0, 0));
         spec.setCreatedAt(new Date());
-        spec.setEntrypointThreadName("testEntrypointThreadName");
+        spec.setEntrypointThreadName("entrypoint");
         spec.setThreadSpecs(Map.of("entrypoint", threadSpec()));
         return spec;
     }
diff --git a/server/src/test/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModelTest.java b/server/src/test/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModelTest.java
new file mode 100644
index 000000000..ad43326a4
--- /dev/null
+++ b/server/src/test/java/io/littlehorse/common/model/getable/global/wfspec/WfSpecModelTest.java
@@ -0,0 +1,102 @@
+package io.littlehorse.common.model.getable.global.wfspec;
+
+import static org.mockito.Mockito.*;
+
+import io.littlehorse.TestUtil;
+import io.littlehorse.common.LHSerializable;
+import io.littlehorse.common.exceptions.LHApiException;
+import io.littlehorse.common.model.getable.global.wfspec.thread.ThreadSpecModel;
+import io.littlehorse.common.model.getable.global.wfspec.thread.ThreadVarDefModel;
+import io.littlehorse.common.model.getable.global.wfspec.variable.VariableDefModel;
+import io.littlehorse.sdk.common.proto.VariableDef;
+import io.littlehorse.sdk.common.proto.VariableType;
+import io.littlehorse.sdk.common.proto.WfRunVariableAccessLevel;
+import io.littlehorse.server.streams.topology.core.MetadataCommandExecution;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Answers;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+public class WfSpecModelTest {
+
+    private final WfSpecModel wfSpec = TestUtil.wfSpec("my-wf");
+    private final WfSpecModel parentWfSpec = TestUtil.wfSpec("my-parent-wf");
+    private final MetadataCommandExecution mockContext = mock(Answers.RETURNS_DEEP_STUBS);
+    private ThreadSpecModel childEntrypointThread;
+    private VariableDefModel variableDef;
+
+    @BeforeEach
+    public void setup() {
+        childEntrypointThread = spy(wfSpec.getThreadSpecs().get(wfSpec.getEntrypointThreadName()));
+        VariableDef variableDefProto = VariableDef.newBuilder()
+                .setName("my-var")
+                .setType(VariableType.BOOL)
+                .build();
+        variableDef = LHSerializable.fromProto(variableDefProto, VariableDefModel.class, mockContext);
+        ThreadVarDefModel inheritedVariable =
+                new ThreadVarDefModel(variableDef, false, false, WfRunVariableAccessLevel.INHERITED_VAR);
+        childEntrypointThread.setVariableDefs(List.of(inheritedVariable));
+        wfSpec.setThreadSpecs(Map.of(wfSpec.getEntrypointThreadName(), childEntrypointThread));
+    }
+
+    @Test
+    public void shouldPreventInheritedVariablesFromParentWfSpec() {
+        wfSpec.setParentWfSpec(null);
+        verify(childEntrypointThread, never()).validate();
+        Throwable caughtException =
+                Assertions.catchThrowable(() -> wfSpec.validateAndMaybeBumpVersion(Optional.empty(), mockContext));
+        Assertions.assertThat(caughtException)
+                .isNotNull()
+                .isInstanceOf(LHApiException.class)
+                .hasMessageContaining("Only child workflows are allowed to access inherited variables");
+    }
+
+    @Test
+    public void shouldValidateInheritedVariableExists() {
+        when(mockContext.service().getWfSpec("my-parent-wf", 1, 0)).thenReturn(parentWfSpec);
+        wfSpec.setParentWfSpec(new ParentWfSpecReferenceModel("my-parent-wf", 1));
+        verify(childEntrypointThread, never()).validate();
+        Throwable caughtException =
+                Assertions.catchThrowable(() -> wfSpec.validateAndMaybeBumpVersion(Optional.empty(), mockContext));
+        Assertions.assertThat(caughtException)
+                .isNotNull()
+                .isInstanceOf(LHApiException.class)
+                .hasMessageContaining("Inherited variable my-var does not exist in parent WfSpec");
+    }
+
+    @Test
+    public void shouldValidateInheritedIsAccessible() {
+        ThreadVarDefModel parentVariable =
+                new ThreadVarDefModel(variableDef, false, false, WfRunVariableAccessLevel.PRIVATE_VAR);
+        ThreadSpecModel parentEntrypoint = parentWfSpec.getThreadSpecs().get(parentWfSpec.getEntrypointThreadName());
+        parentEntrypoint.setVariableDefs(List.of(parentVariable));
+        when(mockContext.service().getWfSpec("my-parent-wf", 2, 0)).thenReturn(parentWfSpec);
+        wfSpec.setParentWfSpec(new ParentWfSpecReferenceModel("my-parent-wf", 2));
+        verify(childEntrypointThread, never()).validate();
+        Throwable caughtException =
+                Assertions.catchThrowable(() -> wfSpec.validateAndMaybeBumpVersion(Optional.empty(), mockContext));
+        Assertions.assertThat(caughtException)
+                .isNotNull()
+                .isInstanceOf(LHApiException.class)
+                .hasMessageContaining("Inherited variable my-var is defined as PRIVATE in parent WfSpec");
+    }
+
+
+    @Test
+    public void shouldIncreaseTheMajorVersionWhenAPublicVariableChangesItsAccessLevel() {
+        WfSpecModel oldVersion = TestUtil.wfSpec("my-wf");
+        ThreadSpecModel entrypointThread = spy(wfSpec.getThreadSpecs().get(wfSpec.getEntrypointThreadName()));
+        doNothing().when(entrypointThread).validate();
+        entrypointThread.setVariableDefs(List.of());
+        wfSpec.setThreadSpecs(Map.of(wfSpec.getEntrypointThreadName(), entrypointThread));
+        Assertions.assertThat(wfSpec.getId().getMajorVersion()).isEqualTo(0);
+        wfSpec.validateAndMaybeBumpVersion(Optional.of(oldVersion), mockContext);
+        Assertions.assertThat(wfSpec.getId().getMajorVersion()).isEqualTo(1);
+    }
+}