diff --git a/.github/workflows/notebook-test-cron.yml b/.github/workflows/notebook-test-cron.yml
index 79bafc75a0c..4f23297b5ca 100644
--- a/.github/workflows/notebook-test-cron.yml
+++ b/.github/workflows/notebook-test-cron.yml
@@ -35,7 +35,10 @@ jobs:
       - name: Detect changed notebooks
         id: changed-notebooks
         if: "!cancelled()"
-        run: echo "CHANGED_NOTEBOOKS=$(git diff --name-only)" >> "$GITHUB_OUTPUT"
+        run: |
+          echo "CHANGED_NOTEBOOKS<<EOF" >> $GITHUB_OUTPUT
+          echo "$(git diff --name-only)" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
 
       - name: Upload executed notebooks
         if: "!cancelled()"