diff --git a/.github/workflows/develop.yml b/.github/workflows/develop.yml
index c263498..4e94bf2 100644
--- a/.github/workflows/develop.yml
+++ b/.github/workflows/develop.yml
@@ -12,7 +12,9 @@ jobs:
         runs-on: ubuntu-latest
         steps:
           - name: Checkout develop branch
-            uses: actions/checkout@master
+            uses: actions/checkout@v2
+            with: 
+              ref: develop
           - name: Build the TeX files
             uses: ./.github/actions/latex
             env: