diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index e13d623ddb2..434675608f0 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -6,7 +6,7 @@ on:
 
 env:
   # renovate: datasource=crate depName=mdbook versioning=semver
-  MDBOOK_VERSION: 0.4.37
+  MDBOOK_VERSION: 0.4.40
 
 jobs:
   build: