diff --git a/.travis.yml b/.travis.yml
index a0713c4..2a02d79 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,15 @@
 language: ruby
 rvm:
+  - 2.4.0
+  - 2.3
   - 2.2
   - 2.1
   - 1.9.3
   - jruby-18mode
   - jruby-19mode
-  - rbx-18mode
-  - rbx-19mode
   - 1.8.7
 
+before_install:
+  - gem update bundler
+
 script: bundle exec rake test