diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e0b21e21..1917ff41 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CARGO_TERM_COLOR: always
 
diff --git a/ethereum/client/src/tests.rs b/ethereum/client/src/tests.rs
index 80c96487..b0ae3455 100644
--- a/ethereum/client/src/tests.rs
+++ b/ethereum/client/src/tests.rs
@@ -64,6 +64,7 @@ pub struct BlockMerkleRootProof {
     pub merkle_root: B256,
 }
 
+#[allow(dead_code)]
 #[derive(Debug, Clone)]
 struct DeploymentEnv {
     pub wvara_erc20: Address,