diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2dee2da..1a948b3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,7 +9,7 @@ variables:
   DOCKER_CERT_PATH: "$DOCKER_TLS_CERTDIR/client"
   DOCKER_DRIVER: overlay2
 
-image: buildtool/build-tools:0.0.23
+image: buildtool/build-tools:${BUILDTOOLS_VERSION}
 services:
   - docker:19.03.12-dind