diff --git a/.github/workflows/patch.yml b/.github/workflows/patch.yml
index 2e89ea5e..1c187f67 100644
--- a/.github/workflows/patch.yml
+++ b/.github/workflows/patch.yml
@@ -23,8 +23,10 @@ jobs:
       id: checkout
       timeout-minutes: 15
       run: |
+        PDFium_BRANCH=$(git ls-remote --sort version:refname --refs https://pdfium.googlesource.com/pdfium.git 'chromium/*' | tail -n 1 | cut -d/ -f3-4)
+        echo "Checking out branch $PDFium_BRANCH"
         gclient config --unmanaged "https://pdfium.googlesource.com/pdfium.git" --custom-var "checkout_configuration=minimal"
-        gclient sync --no-history --shallow
+        gclient sync -r "origin/${PDFium_BRANCH}" --no-history --shallow
 
     - name: Create patch script
       run: |