diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 39e96f5..f35c29d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ stages:
 variables:
   DOCKER_HOST: tcp://docker:2375/
 
-image: buildtool/build-tools:0.0.20
+image: buildtool/build-tools:${BUILDTOOLS_VERSION}
 
 build:
   stage: build