diff --git a/.gitea/workflows/CI.yml b/.gitea/workflows/CI.yml
index 99d7219..67f158c 100644
--- a/.gitea/workflows/CI.yml
+++ b/.gitea/workflows/CI.yml
@@ -23,7 +23,8 @@ jobs:
     steps:
     - name: Get current date as package key
       id: cache_key
-      run: echo "key=$(date +'%W')" >> $GITHUB_OUTPUT
+      shell: bash
+      run: echo "key=$(date +'%W')" >> "$GITHUB_OUTPUT"
 
     - name: Checkout repository
       uses: actions/checkout@v6