diff --git a/.github/workflows/build-pdf.yml b/.github/workflows/build-pdf.yml
index 3c5aae7..2413d2d 100644
--- a/.github/workflows/build-pdf.yml
+++ b/.github/workflows/build-pdf.yml
@@ -4,7 +4,7 @@ on: push
 jobs:
   build-template:
     name: Build template
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Install TeX Live
         run: sudo apt install texlive-full