diff --git a/.travis.yml b/.travis.yml
index 9efaa05..81c652a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,10 @@ sudo: false
 language: ruby
 
 rvm:
-  - 2.3.3
-  - 2.2.6
+  - 2.5.0
+  - 2.4.3
+  - 2.3.6
+  - 2.2.9
   - 2.1.10
 
 cache: bundler