diff --git a/.github/workflows/update_post_dates.yml b/.github/workflows/update_post_dates.yml
index c1398a89..52addc09 100644
--- a/.github/workflows/update_post_dates.yml
+++ b/.github/workflows/update_post_dates.yml
@@ -24,6 +24,7 @@ jobs:
 
       - name: Check for changes
         id: check_changes
+        shell: bash
         run: |
           git config --global user.name 'github-actions[bot]'
           git config --global user.email 'github-actions[bot]@users.noreply.github.com'