diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 1349f7c..fa31a00 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,9 +18,9 @@ jobs:
         ruby-version: ['3.0', '3.1', '3.2']
 
     steps:
-    - name: Start Cassandra
+    - name: Start Cassandra v4
       run: |
-        docker run --name cassandra -d cassandra:4
+        docker run --name cassandra -d -p 9042:9042 cassandra:4
     - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1