diff --git a/.travis.yml b/.travis.yml
index f975069c..50eab8c4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,6 +29,7 @@ rvm:
   - 2.2.8
   - 2.3.5
   - 2.4.2
+  - 2.5.3
   - ruby-head
 
 branches: