diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f9c901a..1b7f478 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -47,7 +47,7 @@ pages:
   script:
     - apt-get update
     - apt-get install -y curl rsync
-    - curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.31/mdbook-v0.4.31-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=target/release
+    - curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.34/mdbook-v0.4.34-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=target/release
     - garden -vv doc
     - mv target/doc doc/book/doc
     - mv doc/book public