diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index d83cd4fc3f..ac57a79c81 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2