diff --git a/docker-compose.yml b/docker-compose.yml
index 6ada67bf..25f20930 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -25,7 +25,7 @@ services:
       - ./test/fixtures/ldif:/ldif:ro
 
   ci-2.6:
-    image: ruby:2.7
+    image: ruby:2.6
     entrypoint: /code/ci-run.sh
     environment:
       INTEGRATION: openldap