diff --git a/deploy_rln_contract.sh b/deploy_rln_contract.sh
index c92c7e6..d199af7 100644
--- a/deploy_rln_contract.sh
+++ b/deploy_rln_contract.sh
@@ -13,7 +13,13 @@ if [ ! -d "waku-rlnv2-contract" ]; then
     git clone https://github.com/waku-org/waku-rlnv2-contract.git
 fi
 
+if [ -z "$RLN_CONTRACT_REPO_COMMIT" ]; then
+    echo "RLN_CONTRACT_REPO_COMMIT is not set"
+    exit 1
+fi
+
 cd /waku-rlnv2-contract
+git checkout $RLN_CONTRACT_REPO_COMMIT
 
 #3. Replace the hardcoded MAX_MESSAGE_LIMIT
 sed -i "s/\b100\b/${MAX_MESSAGE_LIMIT}/g" script/Deploy.s.sol
diff --git a/docker-compose.yml b/docker-compose.yml
index fbed018..6592794 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -38,6 +38,7 @@ services:
     labels:
       com.centurylinklabs.watchtower.enable: '${WATCHTOWER_ENABLED:-false}'
     environment:
+      - RLN_CONTRACT_REPO_COMMIT=${RLN_CONTRACT_REPO_COMMIT:-64df4593c6a14e43b8b0e9b396d2f4772bb08b34}
       - PRIVATE_KEY=${PRIVATE_KEY}
       - RPC_URL=${RPC_URL:-http://foundry:8545}
       - ETH_FROM=${ETH_FROM}
diff --git a/wakusim.env b/wakusim.env
index 5e13924..eabffd3 100644
--- a/wakusim.env
+++ b/wakusim.env
@@ -15,4 +15,5 @@ ETH_FROM=0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
 MAX_MESSAGE_LIMIT=100
 # RLNv2 limits
 RLN_RELAY_MSG_LIMIT=100
-RLN_RELAY_EPOCH_SEC=600
\ No newline at end of file
+RLN_RELAY_EPOCH_SEC=600
+RLN_CONTRACT_REPO_COMMIT=64df4593c6a14e43b8b0e9b396d2f4772bb08b34
\ No newline at end of file