diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 70e1789..f86b566 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -34,7 +34,7 @@ jobs:
     strategy:
       matrix:
         logstash: [ "7.16.3", "7.17.1", "8.3.2", "8.12.1" ]
-        opensearch: [ "1.3.4", "2.1.0" ]
+        opensearch: [ "1.3.4", "2.1.0", "2.12.0" ]
         secure: [ true, false ]
 
     name: Integration Test logstash-output-opensearch against OpenSearch
@@ -43,6 +43,7 @@ jobs:
       LOGSTASH_VERSION: ${{ matrix.logstash }}
       OPENSEARCH_VERSION: ${{ matrix.opensearch }}
       SECURE_INTEGRATION: ${{ matrix.secure }}
+      OPENSEARCH_INITIAL_ADMIN_PASSWORD: myStrongPassword123!
     steps:
       - name: Checkout plugin
         uses: actions/checkout@v1