diff --git a/.travis.yml b/.travis.yml
index 8b3d39d..5421169 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,8 +4,8 @@ language: ruby
 
 rvm:
   - 2.2.5
-  - 2.3.1
   - 2.3.3
+  - 2.4.0
 
 cache: bundler
 script: bundle exec middleman build