diff --git a/.travis.yml b/.travis.yml
index da31289..237ad07 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ rvm:
   - "2.5.1"
 
 before_install:
+  - "gem install bundler"
   - "phantomjs --version"
   - "export PATH=${PWD}/travis_phantomjs/phantomjs-2.1.1-linux-x86_64/bin:${PATH}"
   - "phantomjs --version"