diff --git a/sign/action.yml b/sign/action.yml
index 2f1e521..fa7ee30 100644
--- a/sign/action.yml
+++ b/sign/action.yml
@@ -34,14 +34,14 @@ runs:
     # https://github.com/macbre/push-to-ghcr/issues/12
     - name: Lowercase container path
       id: container_case
-      uses: ASzc/change-string-case-action@v5
-      with:
-        string: ${{ inputs.container }}
+      shell: bash
+      run: |
+        echo ${{ inputs.container }} | awk '{print tolower($0)}'
 
     - name: Sign container image
       shell: bash
       run: |
-        cosign sign -y --key env://COSIGN_PRIVATE_KEY ${{ steps.container_case.outputs.lowercase }}@${TAGS}
+        cosign sign -y --key env://COSIGN_PRIVATE_KEY ${{ steps.container_case.outputs }}@${TAGS}
       env:
         COSIGN_EXPERIMENTAL: false
         COSIGN_PRIVATE_KEY: ${{ inputs.signing-secret }}
diff --git a/verify/action.yml b/verify/action.yml
index 8094d3d..ca46c8d 100644
--- a/verify/action.yml
+++ b/verify/action.yml
@@ -23,17 +23,17 @@ runs:
     # https://github.com/macbre/push-to-ghcr/issues/12
     - name: Lowercase container path
       id: container_case
-      uses: ASzc/change-string-case-action@v5
-      with:
-        string: ${{ inputs.container }}
+      shell: bash
+      run: |
+        echo ${{ inputs.container }} | awk '{print tolower($0)}'
 
     - name: Verify container
       shell: bash
       run: |
         if [[ -n "${{ inputs.pubkey }}" ]]; then
-          cosign verify --key ${{ inputs.pubkey }} ${{ steps.container_case.outputs.lowercase }}
+          cosign verify --key ${{ inputs.pubkey }} ${{ steps.container_case.outputs }}
         elif [[ -n "${{ inputs.cert-identity }}" && -n "${{ inputs.oidc-issuer }}" ]]; then
-          cosign verify ${{ steps.container_case.outputs.lowercase }} --certificate-identity=${{ inputs.cert-identity }} --certificate-oidc-issuer=${{ inputs.oidc-issuer }}
+          cosign verify ${{ steps.container_case.outputs }} --certificate-identity=${{ inputs.cert-identity }} --certificate-oidc-issuer=${{ inputs.oidc-issuer }}
         else
           exit 1
         fi