diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e55a261..7f9d508 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -142,6 +142,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Set lowercase image name
+        id: image
+        run: echo "name=ghcr.io/$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_OUTPUT"
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -158,8 +162,8 @@ jobs:
           context: .
           push: true
           tags: |
-            ghcr.io/${{ github.repository }}:latest
-            ghcr.io/${{ github.repository }}:${{ github.sha }}
+            ${{ steps.image.outputs.name }}:latest
+            ${{ steps.image.outputs.name }}:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max