diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index fc66c0c..b1c44a8 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -13,7 +13,7 @@ on:
     - closed
 jobs:
   deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Git checkout
         uses: actions/checkout@v2