diff --git a/.travis.yml b/.travis.yml
index 304abbf8..2da87a12 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,7 @@ before_install:
 - MAX_LINE_LENGTH=100 bash ci/check_line_lengths.sh src/**/*.md
 install:
 - source ~/.cargo/env || true
-- cargo install mdbook --version 0.4.1
+- cargo install mdbook --version 0.4.3
 - cargo install mdbook-linkcheck --version 0.7.0
 script:
 - git checkout -b ci