diff --git a/.github/workflows/docker-build-branch.yml b/.github/workflows/docker-build-branch.yml
index ea5ceea..b308b97 100644
--- a/.github/workflows/docker-build-branch.yml
+++ b/.github/workflows/docker-build-branch.yml
@@ -49,7 +49,7 @@ jobs:
           platforms: linux/amd64,linux/aarch64
           push: true
           tags: |
-            ${{ env.REGISTRY | toLower }}/${{ github.repository | toLower }}:${{ env.CLEAN_BRANCH_NAME | toLower }}
+            ${{ toLower(env.REGISTRY) }}/${{ toLower(github.repository) }}:${{ toLower(env.CLEAN_BRANCH_NAME) }}
           labels: |
             branch=${{ env.CLEAN_BRANCH_NAME }}
 
diff --git a/.github/workflows/docker-build-nightly.yml b/.github/workflows/docker-build-nightly.yml
index d62911b..4d38aef 100644
--- a/.github/workflows/docker-build-nightly.yml
+++ b/.github/workflows/docker-build-nightly.yml
@@ -39,7 +39,7 @@ jobs:
           context: .
           platforms: linux/amd64,linux/aarch64
           push: true
-          tags: ${{ env.REGISTRY | toLower }}/${{ github.repository | toLower }}:nightly
+          tags: ${{ toLower(env.REGISTRY) }}/${{ toLower(github.repository) }}:nightly
           labels: "nightly"
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1.4.4