diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e0d8cf6..871840d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ stages:
 - build-manifest
 
 variables:
-  VERSION: 5.9
+  VERSION: "5.9"
   DOCKER_HOST: tcp://docker:2375
   VERSIONARCH: ${VERSION}-${ARCH}