diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 41fcfce38f..598754368e 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   build-and-upload-to-s3:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@master