diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 25648bb..5e0702d 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -7,14 +7,14 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
-          mdbook-version: '0.4.5'
+          mdbook-version: 'latest'
 
       - name: Install mdbook-katex
         uses: actions-rs/cargo@v1