diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8ad86e806be..d5c942d4a91 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -5,7 +5,7 @@
   "packages/fork-diff": "0.6.1",
   "packages/guardian-prover-health-check": "0.1.0",
   "packages/guardian-prover-health-check-ui": "0.2.0",
-  "packages/protocol": "1.10.0",
+  "packages/protocol": "1.9.0",
   "packages/relayer": "0.12.0",
   "packages/snaefell-ui": "1.1.0",
   "packages/supplementary-contracts": "1.0.0",
diff --git a/packages/protocol/package.json b/packages/protocol/package.json
index 864bcdb5467..dfd54350a7c 100644
--- a/packages/protocol/package.json
+++ b/packages/protocol/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@taiko/protocol",
-  "version": "1.10.0",
+  "version": "1.9.0",
   "private": true,
   "scripts": {
     "buildMerkle": "ts-node ./utils/airdrop/buildMerkleTree.ts ./utils/airdrop/airdrop_db/example_claimList.json",