diff --git a/crypto/package.json b/crypto/package.json
index 662b538029..fa25d99646 100644
--- a/crypto/package.json
+++ b/crypto/package.json
@@ -22,7 +22,7 @@
   },
   "dependencies": {
     "@zk-kit/baby-jubjub": "^0.3.0",
-    "@zk-kit/eddsa-poseidon": "^0.5.1",
+    "@zk-kit/eddsa-poseidon": "^0.11.0",
     "@zk-kit/poseidon-cipher": "^0.3.0",
     "ethers": "^6.11.1"
   },
diff --git a/crypto/ts/keys.ts b/crypto/ts/keys.ts
index 17bed6ebd9..a3abbbbe18 100644
--- a/crypto/ts/keys.ts
+++ b/crypto/ts/keys.ts
@@ -25,7 +25,7 @@ export const genRandomSalt = (): bigint => genRandomBabyJubValue();
  * @param privKey A private key generated using genPrivKey()
  * @returns A BabyJub-compatible private key.
  */
-export const formatPrivKeyForBabyJub = (privKey: PrivKey): bigint => BigInt(deriveSecretScalar(privKey));
+export const formatPrivKeyForBabyJub = (privKey: PrivKey): bigint => BigInt(deriveSecretScalar(privKey.toString()));
 
 /**
  * Losslessly reduces the size of the representation of a public key
@@ -49,7 +49,7 @@ export const unpackPubKey = (packed: bigint): PubKey => {
  * @returns A public key associated with the private key
  */
 export const genPubKey = (privKey: PrivKey): PubKey => {
-  const key = derivePublicKey(privKey);
+  const key = derivePublicKey(privKey.toString());
   return [BigInt(key[0]), BigInt(key[1])];
 };
 
diff --git a/domainobjs/ts/commands/PCommand.ts b/domainobjs/ts/commands/PCommand.ts
index 99194fcfb2..8bb1f5f2cb 100644
--- a/domainobjs/ts/commands/PCommand.ts
+++ b/domainobjs/ts/commands/PCommand.ts
@@ -139,7 +139,7 @@ export class PCommand implements ICommand {
   /**
    * @notice Signs this command and returns a Signature.
    */
-  sign = (privKey: PrivKey): Signature => sign(privKey.rawPrivKey, this.hash());
+  sign = (privKey: PrivKey): Signature => sign(privKey.rawPrivKey.toString(), this.hash());
 
   /**
    * @notice Returns true if the given signature is a correct signature of this
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fbc80e10c0..9962c905d7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -343,8 +343,8 @@ importers:
         specifier: ^0.3.0
         version: 0.3.0
       '@zk-kit/eddsa-poseidon':
-        specifier: ^0.5.1
-        version: 0.5.1
+        specifier: ^0.11.0
+        version: 0.11.0
       '@zk-kit/poseidon-cipher':
         specifier: ^0.3.0
         version: 0.3.0
@@ -6168,12 +6168,6 @@ packages:
       tslib: 2.6.2
     dev: true
 
-  /@zk-kit/baby-jubjub@0.1.1:
-    resolution: {integrity: sha512-eWpUSpKKpllGZXE6mdS1IVuegRjY2Yu+3Qccyfg0+gMI8+p0ruioMM/MCK3tg2lRIUJTVd+16UghVcK0145yWg==}
-    dependencies:
-      '@zk-kit/utils': 0.1.0
-    dev: false
-
   /@zk-kit/baby-jubjub@0.2.0:
     resolution: {integrity: sha512-pqiPq621oKpwiIkf1KcVh5MdbFX0V67s9gCmiEkhLMeafZaIXEwVt5qmIu1d2HB4mjXgr4Ys8Jpn2Rw4KXxnFQ==}
     dependencies:
@@ -6192,11 +6186,12 @@ packages:
       circomlib: 2.0.5
     dev: false
 
-  /@zk-kit/eddsa-poseidon@0.5.1:
-    resolution: {integrity: sha512-sPyoyjwg9EZ+tHLGxOG+FDj9XJK1knVjm27nTMV4ZSiQIf0427QWnLhOk7b6zMvFmEpBWTG9gneJ5pr3jzJ4zg==}
+  /@zk-kit/eddsa-poseidon@0.11.0:
+    resolution: {integrity: sha512-8XgIVSD+nTnTEjvdrFVvju6lVQ5rxCfkBnf/nCFN/IteiIpYX7LnxrTOV7pIp3RrWL29WuTvNrT8TlBrHRrUFA==}
     dependencies:
-      '@zk-kit/baby-jubjub': 0.1.1
-      '@zk-kit/utils': 0.1.0
+      '@zk-kit/baby-jubjub': 0.3.0
+      '@zk-kit/utils': 0.8.1
+      buffer: 6.0.3
     dev: false
 
   /@zk-kit/poseidon-cipher@0.3.0:
@@ -6206,10 +6201,6 @@ packages:
       '@zk-kit/utils': 0.3.0
     dev: false
 
-  /@zk-kit/utils@0.1.0:
-    resolution: {integrity: sha512-MZmuw2w2StB7XOSNg1TW4VwnBJ746UDmdXTvxwDO/U85UZfGfM3zb53gG35qz5sWpQo/DjfoKqaScmh6HUtQpA==}
-    dev: false
-
   /@zk-kit/utils@0.3.0:
     resolution: {integrity: sha512-yVBczOwOSV+evSgdsJ0tpPn3oQpbL7a7fRqANDogleaLLte1IFxKTFLz3WNcgd28Asq2guMGiU6SmiEc61uHAg==}
     dev: false
@@ -6220,6 +6211,12 @@ packages:
       buffer: 6.0.3
     dev: false
 
+  /@zk-kit/utils@0.8.1:
+    resolution: {integrity: sha512-m5cvnYo5IBZQCO8H5X0Mw3rGRGEoSqlYXVVF1+4M9IT3olDWcJHLPRqtYGF9zNf+vXV/21srpZ0hX3X2Lzp1TQ==}
+    dependencies:
+      buffer: 6.0.3
+    dev: false
+
   /@zkochan/js-yaml@0.0.6:
     resolution: {integrity: sha512-nzvgl3VfhcELQ8LyVrYOru+UtAy1nrygk2+AGbTm8a5YcO6o8lSjAT+pfg3vJWxIoZKOUhrK6UU7xW/+00kQrg==}
     hasBin: true