diff --git a/.github/workflows/deploy-book.yml b/.github/workflows/deploy-book.yml
index 5eaeed5839..7b8cacc55d 100644
--- a/.github/workflows/deploy-book.yml
+++ b/.github/workflows/deploy-book.yml
@@ -15,7 +15,7 @@ jobs:
 
       - name: Test book
         run: |
-          curl -L https://github.com/rust-lang/mdBook/releases/download/v0.4.5/mdbook-v0.4.5-x86_64-unknown-linux-gnu.tar.gz | tar xz
+          curl -L https://github.com/rust-lang/mdBook/releases/download/v0.4.34/mdbook-v0.4.34-x86_64-unknown-linux-gnu.tar.gz | tar xz
           ./mdbook build book
           ./mdbook test book