diff --git a/packages/contracts/mina-delegation/package.json b/packages/contracts/mina-delegation/package.json
index 43d83e7b..c4480074 100644
--- a/packages/contracts/mina-delegation/package.json
+++ b/packages/contracts/mina-delegation/package.json
@@ -28,7 +28,7 @@
     "o1js"
   ],
   "dependencies": {
-    "o1js": "^1.4.0"
+    "o1js": "^1.5.0"
   },
   "devDependencies": {
     "eslint-plugin-o1js": "^0.4.0",
diff --git a/packages/contracts/mina-delegation/src/delegate.ts b/packages/contracts/mina-delegation/src/delegate.ts
index de1ea280..96006b2c 100644
--- a/packages/contracts/mina-delegation/src/delegate.ts
+++ b/packages/contracts/mina-delegation/src/delegate.ts
@@ -7,15 +7,15 @@ import {
   Struct,
   UInt8,
   ZkProgram,
-  createEcdsa,
-  createForeignCurve,
+  createEcdsaV2,
+  createForeignCurveV2,
 } from 'o1js';
 
 // ----------------------------------------------------------------------------
 // Common data types
 
 /** A Mina foreign curve for Secp256k1, like Ethereum uses. */
-export class Secp256k1 extends createForeignCurve(Crypto.CurveParams.Secp256k1) {
+export class Secp256k1 extends createForeignCurveV2(Crypto.CurveParams.Secp256k1) {
   /** Convert a standard hex public key into this provable struct. */
   static fromHex(publicKey: `0x${string}`): Secp256k1 {
     if (publicKey.startsWith('0x04') && publicKey.length === 4 + 64 + 64) {
@@ -35,7 +35,7 @@ export class Secp256k1 extends createForeignCurve(Crypto.CurveParams.Secp256k1)
 }
 
 /** A Mina-provable ECDSA signature on the Secp256k1 curve, like Ethereum uses. */
-export class Ecdsa extends createEcdsa(Secp256k1) {
+export class Ecdsa extends createEcdsaV2(Secp256k1) {
   // o1js-provided fromHex is good enough
 }