diff --git a/.travis.yml b/.travis.yml
index 24b4a76..20644b1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ rvm:
 jdk:
   - oraclejdk8
 before_script:
+  - gem install bundler
   - bundle exec rake vendor
   - bundle exec rake install_jars
   - ./scripts/travis-before_script.sh