diff --git a/ci/cscs.yml b/ci/cscs.yml
index f1b0fa3..11eac8e 100644
--- a/ci/cscs.yml
+++ b/ci/cscs.yml
@@ -11,14 +11,13 @@ build zen2:
   timeout: 10h
   variables:
     DOCKERFILE: ci/slurm_docker/Dockerfile
-    WATCH_FILECHANGES: ci/slurm_docker/Dockerfile ci/slurm_docker/cgroup.conf ci/slurm_docker/entrypoint.sh ci/slurm_docker/install_slurm.sh ci/slurm_docker/slurm.conf.in
-    PERSIST_IMAGE_NAME: $CSCS_REGISTRY_PATH/base/public/slurm-uenv-mount:$CI_COMMIT_SHA
+    PERSIST_IMAGE_NAME: $CSCS_REGISTRY_PATH/base/public/slurm-uenv-mount:$CI_COMMIT_REF_SLUG
 
 build:
   extends: .container-runner-eiger
   needs: ["build zen2"]
   stage: buildtest
-  image: $CSCS_REGISTRY_PATH/base/public/slurm-uenv-mount:$CI_COMMIT_SHA
+  image: $CSCS_REGISTRY_PATH/base/public/slurm-uenv-mount:$CI_COMMIT_REF_SLUG
   script:
     - |
       CXX=g++-12 CC=gcc-12 meson setup builddir