diff --git a/.github/workflows/actions/lambda-deploy/action.yml b/.github/workflows/actions/lambda-deploy/action.yml
index d1328ae..ba19c67 100644
--- a/.github/workflows/actions/lambda-deploy/action.yml
+++ b/.github/workflows/actions/lambda-deploy/action.yml
@@ -55,6 +55,7 @@ runs:
         aws-region: ${{ inputs.aws-region }}
     - name: Set Docker image tag
       id: set_tag
+      shell: bash
       run: |
         SHORT_SHA=$(echo "${{ inputs.git-sha }}" | cut -c1-7)
         BRANCH=$(echo "${{ inputs.git-ref }}" | tr '/' '-')