diff --git a/.gitea/workflows/docker-publish.yml b/.gitea/workflows/docker-publish.yml
index 2e44fec..913ec84 100644
--- a/.gitea/workflows/docker-publish.yml
+++ b/.gitea/workflows/docker-publish.yml
@@ -54,6 +54,11 @@ jobs:
           echo "branch=$BRANCH" >> "$GITHUB_OUTPUT"
           echo "sha=${GITHUB_SHA::12}" >> "$GITHUB_OUTPUT"
 
+          # Convert repository owner to lowercase
+          OWNER="${GITHUB_REPOSITORY_OWNER}"
+          OWNER="$(echo "$OWNER" | tr '[:upper:]' '[:lower:]')"
+          echo "owner=$OWNER" >> "$GITHUB_OUTPUT"
+
       - uses: docker/setup-buildx-action@v3
 
       - uses: docker/login-action@v3
@@ -68,6 +73,6 @@ jobs:
           context: .
           push: true
           tags: |
-            git.andreas-dahm.eu/${{ github.repository_owner }}/tobeplayed-frontend:${{ steps.prep.outputs.branch }}
-            git.andreas-dahm.eu/${{ github.repository_owner }}/tobeplayed-frontend:${{ steps.prep.outputs.branch }}-${{ steps.prep.outputs.sha }}
-            git.andreas-dahm.eu/${{ github.repository_owner }}/tobeplayed-frontend:latest
\ No newline at end of file
+            git.andreas-dahm.eu/${{ steps.prep.outputs.owner }}/tobeplayed-frontend:${{ steps.prep.outputs.branch }}
+            git.andreas-dahm.eu/${{ steps.prep.outputs.owner }}/tobeplayed-frontend:${{ steps.prep.outputs.branch }}-${{ steps.prep.outputs.sha }}
+            git.andreas-dahm.eu/${{ steps.prep.outputs.owner }}/tobeplayed-frontend:latest
\ No newline at end of file