diff --git a/.travis.yml b/.travis.yml
index b6c864e..4335e9a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,15 +4,20 @@ script: "bundle exec rake ci:metrics"
 rvm:
   - 1.9.3
   - 2.0.0
-  - 2.2.3
+  - 2.1.10
+  - 2.2.8
+  - 2.3.5
+  - 2.4.2
   - ruby-head
   - rbx-2
+  - rbx
 matrix:
   include: []
   allow_failures:
     - rvm: 1.9.3
     - rvm: 2.0.0
     - rvm: rbx-2
+    - rvm: rbx
     - rvm: ruby-head
     - rvm: jruby
       env: JRUBY_OPTS="$JRUBY_OPTS --debug --1.9"  # for simplecov