diff --git a/scripts/config.ts b/scripts/config.ts
index 3fd49ef5..d9d895c7 100644
--- a/scripts/config.ts
+++ b/scripts/config.ts
@@ -344,7 +344,7 @@ function writeL2ChainConfig(argv: any) {
             "EnableArbOS": true,
             "AllowDebugPrecompiles": true,
             "DataAvailabilityCommittee": false,
-            "InitialArbOSVersion": 30,
+            "InitialArbOSVersion": 20,
             "InitialChainOwner": argv.l2owner,
             "GenesisBlockNum": 0
         }
@@ -377,7 +377,7 @@ function writeL3ChainConfig(argv: any) {
             "EnableArbOS": true,
             "AllowDebugPrecompiles": true,
             "DataAvailabilityCommittee": false,
-            "InitialArbOSVersion": 30,
+            "InitialArbOSVersion": 20,
             "InitialChainOwner": "0x0000000000000000000000000000000000000000",
             "GenesisBlockNum": 0
         }
diff --git a/test-node.bash b/test-node.bash
index 89d18ddc..3f0e4ae6 100755
--- a/test-node.bash
+++ b/test-node.bash
@@ -2,7 +2,7 @@
 
 set -e
 
-NITRO_NODE_VERSION=offchainlabs/nitro-node:v3.0.0-e6f81cb-dev
+NITRO_NODE_VERSION=offchainlabs/nitro-node:v2.3.3-6a1c1a7-dev
 BLOCKSCOUT_VERSION=offchainlabs/blockscout:v1.0.0-c8db5b1
 
 # This commit matches the v1.2.1 contracts, with additional fixes for rollup deployment script.