diff --git a/.github/workflows/update_json_date.yml b/.github/workflows/update_json_date.yml
index 4de24be9..e2e0b550 100644
--- a/.github/workflows/update_json_date.yml
+++ b/.github/workflows/update_json_date.yml
@@ -10,7 +10,13 @@ jobs:
     - name: Checkout PR Branch
       uses: actions/checkout@v4
       with:
-        ref: ${{ github.head_ref }}
+        ref: ${{ github.event.pull_request.base.ref }}
+
+    - name: Fetch PR changes
+      run: |
+          git remote add fork https://github.com/${{ github.event.pull_request.head.repo.full_name }}.git
+          git fetch fork ${{ github.event.pull_request.head.ref }}:pullreq
+          git checkout pullreq
 
     - name: Update JSON
       id: changed-files