diff --git a/.github/workflows/update-container-tags.yaml b/.github/workflows/update-container-tags.yaml
index e92a183..9ff5494 100644
--- a/.github/workflows/update-container-tags.yaml
+++ b/.github/workflows/update-container-tags.yaml
@@ -8,6 +8,8 @@ name: update container tags
 jobs:
   update-container-tags:
     runs-on: ubuntu-latest
+    env:
+      GITHUB_REF: ${{ github.head_ref }}
     steps:
       - uses: actions/checkout@v2
         with:
@@ -19,7 +21,7 @@ jobs:
           git fetch
       - name: git checkout
         run: |
-          git checkout ${{ github.head_ref }}
+          git checkout "$GITHUB_REF"
 
       # compare  to upstream main branch
       - name: git add remote
@@ -40,6 +42,6 @@ jobs:
           add: 'helm-quarry/values.yaml'
           author_name: Github Action
           author_email: auto@github.com
-          branch: ${{ github.head_ref }}
+          branch: ${{ env.GITHUB_REF }}
           message: 'auto update of ${{ inputs.imagename }} tag'
           pull: --rebase --autostash
diff --git a/helm-quarry/values.yaml b/helm-quarry/values.yaml
index c2ec398..915e32d 100644
--- a/helm-quarry/values.yaml
+++ b/helm-quarry/values.yaml
@@ -1,7 +1,7 @@
 web:
   repository: 'quay.io/wikimedia-quarry/quarry'
-  tag: pr-71 # web tag managed by github actions
+  tag: pr-72 # web tag managed by github actions
 
 worker:
   repository: 'quay.io/wikimedia-quarry/quarry'
-  tag: pr-71 # worker tag managed by github actions
+  tag: pr-72 # worker tag managed by github actions