diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b11e25e..1e38dee 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,7 +6,7 @@ variables:
 
 build:
   stage: build
-  image: buildtool/build-tools:0.0.6
+  image: buildtool/build-tools:${BUILDTOOLS_VERSION}
   services:
     - docker:dind
   script: