diff --git a/.travis.yml b/.travis.yml
index 1638a27..43e43b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,11 +15,15 @@ matrix:
       gemfile: spec/install-gem-in-bundler.gemfile
     - rvm: 2.1
     - rvm: 2.3.3
-    - rvm: 2.4.0-preview3
+    - rvm: 2.4.0-rc1
     - rvm: jruby-9.1.6.0
       jdk: oraclejdk8
       env:
         - JRUBY_OPTS=--debug
+    - rvm: jruby-head
+      jdk: oraclejdk8
+      env:
+        - JRUBY_OPTS=--debug
 
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