diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5c41ffc..7083295 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -7,7 +7,6 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository_owner }}/atauth-gateway
 
 permissions:
   contents: read
@@ -42,8 +41,10 @@ jobs:
         run: |
           VERSION=${GITHUB_REF_NAME#v}
           SHORT_SHA=$(echo "$GITHUB_SHA" | cut -c1-7)
+          IMAGE_NAME=$(echo "${{ github.repository_owner }}/atauth-gateway" | tr '[:upper:]' '[:lower:]')
           echo "version=$VERSION" >> "$GITHUB_OUTPUT"
           echo "short_sha=$SHORT_SHA" >> "$GITHUB_OUTPUT"
+          echo "image_name=$IMAGE_NAME" >> "$GITHUB_OUTPUT"
 
       - name: Log in to GHCR
         uses: docker/login-action@v3
@@ -64,7 +65,7 @@ jobs:
           build-args: |
             BUILD_COMMIT=${{ steps.meta.outputs.short_sha }}
           tags: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ steps.meta.outputs.image_name }}:${{ steps.meta.outputs.version }}
+            ${{ env.REGISTRY }}/${{ steps.meta.outputs.image_name }}:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max