diff --git a/.github/workflows/update-submodule-files.yml b/.github/workflows/update-submodule-files.yml
index ded14e1..2bebeb8 100644
--- a/.github/workflows/update-submodule-files.yml
+++ b/.github/workflows/update-submodule-files.yml
@@ -26,9 +26,12 @@ jobs:
           python-version: '3.x'
 
       - name: Import GPG key
+        env:
+          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
+          GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
         run: |
-          echo "${{ secrets.GPG_PRIVATE_KEY }}" | gpg --batch --import
-          echo "${{ secrets.GPG_PASSPHRASE }}" | gpg --batch --yes --passphrase-fd 0 --pinentry-mode loopback --edit-key F768450FB05B817D0B4BC26FB9B6A9B428C8676A trust quit
+          echo "$GPG_PRIVATE_KEY" | gpg --batch --import
+          echo "$GPG_PASSPHRASE" | gpg --batch --yes --passphrase-fd 0 --pinentry-mode loopback --edit-key F768450FB05B817D0B4BC26FB9B6A9B428C8676A trust quit
 
       - name: Run update script
         run: python update_repo.py