diff --git a/.github/workflows/update-pages.yml b/.github/workflows/update-pages.yml
index becd4e59..d07733a8 100644
--- a/.github/workflows/update-pages.yml
+++ b/.github/workflows/update-pages.yml
@@ -37,7 +37,7 @@ jobs:
 
       - name: Get current date
         id: date
-        run: echo "date=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
+        run: echo "date=$(date +'%Y-%m-%d')" >> "${GITHUB_OUTPUT}"
 
       - name: Prepare gh-pages
         run: |