diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 48e7ff47a..5d0acfcdc 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -34,7 +34,7 @@ jobs:
           sudo sysctl -w vm.max_map_count=262144
       - uses: ./.github/actions/opensearch
         with:
-          cluster-version: "2.19.0"
+          cluster-version: 2.18.0
           disable-security: true
       - uses: ruby/setup-ruby@v1
         with: