diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f527a41..b89f9df 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,7 +8,7 @@ setup:docker:linux:
   variables:
     DOCKER_HOST: tcp://docker:2375/
     DOCKER_DRIVER: overlay2
-    DOCKER_IMAGE_NAME_CI: ${CI_REGISTRY_IMAGE}/puma-ci-linux:${CI_COMMIT_REF_SLUG}
+    DOCKER_IMAGE_NAME_CI: ${CI_REGISTRY_IMAGE}/puma-ci-linux:master
   services:
     - docker:dind
   script: