diff --git a/.travis.yml b/.travis.yml
index c827620..5054cc7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,9 +19,11 @@ addons:
     - gcc
     - binutils-dev
     - libiberty-dev
+    - npm
 before_script:
 - smtp-sink 2525 1000&
 - sudo chgrp -R postdrop /var/spool/postfix/maildrop
+- sudo npm install gitbook-cli -g
 script:
 - cargo test --verbose --all
 after_success: