diff --git a/.travis.yml b/.travis.yml
index bbac70e..6090f79 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ matrix:
     - rvm: 2.2.8
     - rvm: 2.3.5
     - rvm: 2.4.2
+    - rvm: 2.5.1
     - rvm: jruby-9.1.8.0
       env:
         - JRUBY_OPTS="--debug"