diff --git a/.travis.yml b/.travis.yml
index bed6e27..6b9795b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,7 @@
 language: ruby
 rvm:
   - 2.3.0
+  - 2.2.4
+  - 2.1.8
+  - 2.0.0
 before_install: gem install bundler -v 1.11.2