diff --git a/.travis.yml b/.travis.yml
index c9ef058b..bf2e9acb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ rvm:
   - 2.4.1
   - 2.4.2
   - 2.5.0
+  - ruby-head
 before_install:
   - "env"
   - "echo 'gem: --no-ri --no-rdoc' > ~/.gemrc"