diff --git a/.travis.yml b/.travis.yml
index 99727bf..edbe773 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ script: "./script/cibuild"
 #environment
 language: ruby
 rvm:
-  - 2.1.0
+  - 2.3.3
 
 branches:
   only: