diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f01972..936e54f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # TON Plugin for the IntelliJ IDEs Changelog
 
+## [2.5.1]
+
+### Added
+- Tolk 0.8 support
+
 ## [2.5.0]
 
 ### Added
diff --git a/gradle.properties b/gradle.properties
index 5fcfcc7..8851cd3 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,6 +1,6 @@
 org.gradle.jvmargs=-Xmx4096m
 pluginGroup=org.ton
-pluginVersion=2.5.0
+pluginVersion=2.5.1
 publishChannel=release
 publishToken=token
 enableBuildSearchableOptions=false
@@ -9,7 +9,7 @@ enableBuildSearchableOptions=false
 # https://www.jetbrains.com/intellij-repository/snapshots/
 ideaVersion=2024.3
 kotlin.stdlib.default.dependency=false
-buildNumber=17
+buildNumber=1
 
 platformType=IC
 platformVersion=2024.3
diff --git a/modules/tolk/src/org/ton/intellij/tolk/parser/TolkParser.bnf b/modules/tolk/src/org/ton/intellij/tolk/parser/TolkParser.bnf
index 7fc3f8a..ef93c4a 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/parser/TolkParser.bnf
+++ b/modules/tolk/src/org/ton/intellij/tolk/parser/TolkParser.bnf
@@ -506,8 +506,7 @@ Var ::= IDENTIFIER (':' TypeExpression)? {
     extends = VarDefinition
 }
 
-DotExpression ::= Expression '.' CallExpression {
-    pin=2
+DotExpression ::= Expression '.' (IntegerExpression|CallExpression) {
     methods=[
         left="/Expression[0]"
         right="/Expression[1]"
@@ -570,7 +569,7 @@ private TupleElement ::= Expression {
 }
 private TupleElement_recovery ::= !(','|']'|';')
 
-private IntegerExpression ::= INTEGER_LITERAL
+IntegerExpression ::= INTEGER_LITERAL
 private BoolExpression ::= 'true' | 'false'
 private NullExpression ::= 'null' !'('
 
@@ -626,8 +625,11 @@ TypeExpression ::= FunType | UnionType | AtomicType {
     ]
 }
 
-private AtomicType ::= AutoType | VoidType | TensorOrParenType | TupleType | NullType | TypeIdentifier
+private AtomicType ::= NullableType | AutoType | VoidType | TensorOrParenType | TupleType | NullType | TypeIdentifier
 
+NullableType ::= (TensorOrParenType|TupleType|TypeIdentifier) '?' {
+    mixin="org.ton.intellij.tolk.psi.impl.TolkNullableTypeMixin"
+}
 UnionType ::= unionType1 | unionType2
 NullType ::= 'null' {
     mixin="org.ton.intellij.tolk.psi.impl.TolkNullTypeMixin"
diff --git a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkDotExpressionMixin.kt b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkDotExpressionMixin.kt
index 49af30b..1fed13b 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkDotExpressionMixin.kt
+++ b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkDotExpressionMixin.kt
@@ -4,7 +4,8 @@ import com.intellij.extapi.psi.ASTWrapperPsiElement
 import com.intellij.lang.ASTNode
 import org.ton.intellij.tolk.psi.TolkDotExpression
 import org.ton.intellij.tolk.type.TolkType
+import org.ton.intellij.tolk.type.infer.inference
 
 abstract class TolkDotExpressionMixin(node: ASTNode) : ASTWrapperPsiElement(node), TolkDotExpression {
-    override val type: TolkType? get() = right?.type
+    override val type: TolkType? get() = inference?.getType(this)
 }
diff --git a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkFieldExpressionMixin.kt b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkFieldExpressionMixin.kt
new file mode 100644
index 0000000..8f984d6
--- /dev/null
+++ b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkFieldExpressionMixin.kt
@@ -0,0 +1,11 @@
+package org.ton.intellij.tolk.psi.impl
+
+import com.intellij.extapi.psi.ASTWrapperPsiElement
+import com.intellij.lang.ASTNode
+import org.ton.intellij.tolk.psi.TolkFieldExpression
+import org.ton.intellij.tolk.type.TolkType
+import org.ton.intellij.tolk.type.infer.inference
+
+abstract class TolkFieldExpressionMixin(node: ASTNode) : ASTWrapperPsiElement(node), TolkFieldExpression {
+    override val type: TolkType? get() = inference?.getType(this)
+}
\ No newline at end of file
diff --git a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullTypeMixin.kt b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullTypeMixin.kt
index 2156680..ca7831e 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullTypeMixin.kt
+++ b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullTypeMixin.kt
@@ -6,5 +6,5 @@ import org.ton.intellij.tolk.psi.TolkNullType
 import org.ton.intellij.tolk.type.TolkType
 
 abstract class TolkNullTypeMixin(node: ASTNode) : ASTWrapperPsiElement(node), TolkNullType {
-    override val type: TolkType get() = TolkType.Unknown
+    override val type: TolkType get() = TolkType.Null
 }
\ No newline at end of file
diff --git a/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullableTypeMixin.kt b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullableTypeMixin.kt
new file mode 100644
index 0000000..07748e3
--- /dev/null
+++ b/modules/tolk/src/org/ton/intellij/tolk/psi/impl/TolkNullableTypeMixin.kt
@@ -0,0 +1,12 @@
+package org.ton.intellij.tolk.psi.impl
+
+import com.intellij.extapi.psi.ASTWrapperPsiElement
+import com.intellij.lang.ASTNode
+import org.ton.intellij.tolk.psi.TolkNullableType
+import org.ton.intellij.tolk.type.TolkType
+
+abstract class TolkNullableTypeMixin(node: ASTNode) : ASTWrapperPsiElement(node), TolkNullableType {
+    override val type: TolkType? get() {
+        return TolkType.nullable(typeExpression.type ?: return null)
+    }
+}
\ No newline at end of file
diff --git a/modules/tolk/src/org/ton/intellij/tolk/type/TolkType.kt b/modules/tolk/src/org/ton/intellij/tolk/type/TolkType.kt
index 5c0c810..5d9d328 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/type/TolkType.kt
+++ b/modules/tolk/src/org/ton/intellij/tolk/type/TolkType.kt
@@ -52,7 +52,19 @@ sealed interface TolkType {
     class UnionType(
         val elements: List<TolkType>
     ) : TolkType {
-        override fun toString(): String = elements.joinToString(" | ")
+        init {
+            check(elements.size > 1) { "UnionType must have at least two elements, got ${elements.size}: $elements" }
+        }
+        val hasNull = elements.any { it == Null }
+        val isNullable = elements.size == 2 && hasNull && !elements.all { it == Null }
+
+        override fun toString(): String {
+            return if (isNullable) {
+                "${elements.first { it != Null }}?"
+            } else {
+                elements.joinToString(" | ")
+            }
+        }
     }
 
     companion object {
@@ -64,6 +76,18 @@ sealed interface TolkType {
         val Tuple = TolkPrimitiveType.Tuple
         val Unit = TolkPrimitiveType.Unit
         val Bool = TolkPrimitiveType.Bool
+        val Null = TolkPrimitiveType.Null
+
+        fun nullable(element: TolkType): TolkType {
+            return if (element is UnionType) {
+                if (element.hasNull) element
+                else UnionType(element.elements + Null)
+            } else if (element != Null) {
+                UnionType(listOf(element, Null))
+            } else {
+                element
+            }
+        }
 
         fun create(vararg elements: TolkType): TolkType {
             return create(elements.toList())
@@ -100,6 +124,7 @@ sealed class TolkPrimitiveType(
     object Tuple : TolkPrimitiveType("tuple")
     object Unit : TolkPrimitiveType("()")
     object Bool : TolkPrimitiveType("bool")
+    object Null : TolkPrimitiveType("null")
 
     override fun toString(): String = name
 }
diff --git a/modules/tolk/src/org/ton/intellij/tolk/type/infer/TypeInference.kt b/modules/tolk/src/org/ton/intellij/tolk/type/infer/TypeInference.kt
index f8d6dde..d6d009e 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/type/infer/TypeInference.kt
+++ b/modules/tolk/src/org/ton/intellij/tolk/type/infer/TypeInference.kt
@@ -453,6 +453,7 @@ class TolkInferenceWalker(
             is TolkTupleExpression -> infer(element, expectedType)
             is TolkParenExpression -> infer(element, expectedType)
             is TolkTensorExpression -> infer(element, expectedType)
+            is TolkFieldExpression -> infer(element, expectedType)
             is TolkReferenceExpression -> infer(element)
             is TolkLiteralExpression -> element.type
             is TolkUnitExpression -> TolkType.Unit
@@ -551,12 +552,20 @@ class TolkInferenceWalker(
         element: TolkDotExpression,
         expectedType: TolkType? = null,
     ): TolkType? {
-        infer(element.left)
+        val leftType = infer(element.left)
         val type = element.right?.let { expression ->
-            if (expression is TolkCallExpression) {
-                infer(expression, expectedType, withFirstArg = element.left)
-            } else {
-                infer(expression, expectedType)
+            when (expression) {
+                is TolkCallExpression -> infer(expression, expectedType, withFirstArg = element.left)
+                is TolkIntegerExpression -> {
+                    val typeElementIndex = expression.integerLiteral.text.toIntOrNull() ?: return@let null
+                    val typeElements = when (leftType) {
+                        is TolkType.TypedTuple -> leftType.elements
+                        is TolkType.Tensor -> leftType.elements
+                        else -> null
+                    }
+                    typeElements?.getOrNull(typeElementIndex)
+                }
+                else -> null
             }
         }
         return ctx.setType(element, type ?: expectedType)
@@ -604,16 +613,19 @@ class TolkInferenceWalker(
                     unify(paramType.inputType, argType.inputType)
                     unify(paramType.returnType, argType.returnType)
                 }
+
                 paramType is TolkType.TypedTuple && argType is TolkType.TypedTuple -> {
                     paramType.elements.zip(argType.elements).forEach { (param, arg) ->
                         unify(param, arg)
                     }
                 }
+
                 paramType is TolkType.Tensor && argType is TolkType.Tensor -> {
                     paramType.elements.zip(argType.elements).forEach { (param, arg) ->
                         unify(param, arg)
                     }
                 }
+
                 paramType is TolkType.ParameterType && argType != null && argType !is TolkType.ParameterType -> {
                     typeMapping[paramType.psiElement] = argType
                 }
@@ -659,6 +671,19 @@ class TolkInferenceWalker(
         )
     }
 
+//    private fun infer(element: TolkFieldExpression, expectedType: TolkType? = null): TolkType? {
+//        val expressions = element.expressionList
+//        val left = expressions.getOrNull(0) ?: return null
+//        val leftType = infer(left) ?: return null
+//        val typeElements = when (leftType) {
+//            is TolkType.Tensor -> leftType.elements
+//            is TolkType.TypedTuple -> leftType.elements
+//            else -> return null
+//        }
+//        val rightIndex = element.integerLiteral?.text?.toIntOrNull() ?: return null
+//        return ctx.setType(element, typeElements.getOrNull(rightIndex) ?: expectedType)
+//    }
+
     private fun infer(element: TolkTupleExpression, expectedType: TolkType? = null): TolkType? {
         val expectedTypes = (expectedType as? TolkType.TypedTuple)?.elements
         val expressions = element.expressionList
diff --git a/modules/tolk/src/org/ton/intellij/tolk/type/printTolkType.kt b/modules/tolk/src/org/ton/intellij/tolk/type/printTolkType.kt
index b54c372..237d5e6 100644
--- a/modules/tolk/src/org/ton/intellij/tolk/type/printTolkType.kt
+++ b/modules/tolk/src/org/ton/intellij/tolk/type/printTolkType.kt
@@ -47,6 +47,11 @@ fun PresentationTreeBuilder.printTolkType(type: TolkType) {
         }
 
         is TolkType.UnionType -> {
+            if (type.isNullable) {
+                printTolkType(type.elements.first { it != TolkType.Null })
+                text("?")
+                return
+            }
             val iterator = type.elements.iterator()
             while (iterator.hasNext()) {
                 val element = iterator.next()