diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 192867b..8842bf2 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -16,7 +16,7 @@ jobs:
     - name: Install Rust (rustup)
       run: rustup update stable --no-self-update && rustup default stable
     - name: Install mdBook
-      run: cargo install mdbook
+      run: cargo install --version 0.4.34 mdbook 
     - name: Build book
       run: mdbook build .
     - name: Deploy to GitHub