diff --git a/contracts/protocol/core/immutable/MixinConstants.sol b/contracts/protocol/core/immutable/MixinConstants.sol
index 7a9b12a6..7207d779 100644
--- a/contracts/protocol/core/immutable/MixinConstants.sol
+++ b/contracts/protocol/core/immutable/MixinConstants.sol
@@ -25,7 +25,7 @@ import "../../IRigoblockV3Pool.sol";
 /// @dev Inheriting from interface is required as we override public variables.
 abstract contract MixinConstants is IRigoblockV3Pool {
     /// @inheritdoc IRigoblockV3PoolImmutable
-    string public constant override VERSION = "HF 3.1.0";
+    string public constant override VERSION = "HF 3.1.1";
 
     bytes32 internal constant _POOL_INIT_SLOT = 0xe48b9bb119adfc3bccddcc581484cc6725fe8d292ebfcec7d67b1f93138d8bd8;
 
diff --git a/test/core/RigoblockPool.Basetoken.spec.ts b/test/core/RigoblockPool.Basetoken.spec.ts
index 0083e0d5..3ccba072 100644
--- a/test/core/RigoblockPool.Basetoken.spec.ts
+++ b/test/core/RigoblockPool.Basetoken.spec.ts
@@ -40,7 +40,7 @@ describe("BaseTokenProxy", async () => {
             const { pool } = await setupTests()
             const authority = await deployments.get("Authority")
             expect(await pool.authority()).to.be.eq(authority.address)
-            expect(await pool.VERSION()).to.be.eq('HF 3.1.0')
+            expect(await pool.VERSION()).to.be.eq('HF 3.1.1')
         })
     })