diff --git a/.travis.yml b/.travis.yml
index 814c109..a2a0e28 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,8 +7,9 @@ rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.10
-  - 2.2.5
-  - 2.3.1
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
   - ruby-head
   - jruby-18mode
   - jruby-19mode