diff --git a/ci/install.sh b/ci/install.sh
index fea846b6e0..ed13cc1650 100644
--- a/ci/install.sh
+++ b/ci/install.sh
@@ -13,7 +13,7 @@ main() {
 
     # install mdbook
     curl -LSfs https://japaric.github.io/trust/install.sh | \
-        sh -s -- --git rust-lang-nursery/mdbook --tag v0.2.1
+        sh -s -- --git rust-lang-nursery/mdbook --tag v0.3.1
 
     pip install linkchecker --user
 }