diff --git a/.travis.yml b/.travis.yml
index 0010b4b9..fe4a5300 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 rvm:
-  - 2.2.3
+  - 2.1
+  - 2.2
+  - 2.3
+  - 2.4
 before_install: gem install bundler
 language: ruby
 script: script/cibuild