diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a258b7d..fd6ee7d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,6 +3,10 @@ image: docker:latest
 services:
   - docker:dind
 
+variables:
+  DOCKER_MYSQL_IMAGE: percona:5.7
+  DOCKER_POSTGRES_IMAGE: postgres:10.1
+
 before_script:
   - apk add --no-cache python py2-pip git
   - pip install --no-cache-dir docker-compose==1.16.0