diff --git a/Cargo.lock b/Cargo.lock
index 015e3fcef..dfd4eea1c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2363,8 +2363,7 @@ dependencies = [
 [[package]]
 name = "halo2_gadgets"
 version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "126a150072b0c38c7b573fe3eaf0af944a7fed09e154071bf2436d3f016f7230"
+source = "git+https://github.com/parazyd/halo2?branch=v3#481f00066dbfa5199195062b7d1f497db0281c16"
 dependencies = [
  "arrayvec",
  "bitvec",
diff --git a/Cargo.toml b/Cargo.toml
index e9bcedaf7..5a30ce237 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -327,3 +327,4 @@ required-features = ["zk"]
 
 [patch.crates-io]
 halo2_proofs = {git="https://github.com/parazyd/halo2", branch="v3"}
+halo2_gadgets = {git="https://github.com/parazyd/halo2", branch="v3"}
diff --git a/proof/opcodes.zk b/proof/opcodes.zk
index 49e576450..40ff1bfba 100644
--- a/proof/opcodes.zk
+++ b/proof/opcodes.zk
@@ -37,7 +37,8 @@ circuit "Opcodes" {
 	constrain_equal_point(value_commit, value_commit2);
 
 	one = witness_base(1);
-	c = poseidon_hash(one, blind);
+	two = witness_base(2);
+	c = poseidon_hash(one, two, blind);
 	constrain_instance(c);
 
 	d = poseidon_hash(one, blind, ec_get_x(value_commit), ec_get_y(value_commit));
diff --git a/src/sdk/Cargo.toml b/src/sdk/Cargo.toml
index 4d51a1a24..f03a55aab 100644
--- a/src/sdk/Cargo.toml
+++ b/src/sdk/Cargo.toml
@@ -44,3 +44,4 @@ rand = "0.8.5"
 
 [patch.crates-io]
 halo2_proofs = {git="https://github.com/parazyd/halo2", branch="v3"}
+halo2_gadgets = {git="https://github.com/parazyd/halo2", branch="v3"}
diff --git a/tests/zkvm_opcodes.rs b/tests/zkvm_opcodes.rs
index a402f4d92..ada46f0c7 100644
--- a/tests/zkvm_opcodes.rs
+++ b/tests/zkvm_opcodes.rs
@@ -61,8 +61,8 @@ fn zkvm_opcodes() -> Result<()> {
     let c1 = pallas::Base::random(&mut OsRng);
     let c3 = pallas::Base::random(&mut OsRng);
     let c2 = {
-        let messages = [pallas::Base::one(), blind];
-        poseidon::Hash::<_, P128Pow5T3, ConstantLength<2>, 3, 2>::init().hash(messages)
+        let messages = [pallas::Base::one(), pallas::Base::from(2), blind];
+        poseidon::Hash::<_, P128Pow5T3, ConstantLength<3>, 3, 2>::init().hash(messages)
     };
 
     tree.append(&MerkleNode::from(c0));