diff --git a/.travis.yml b/.travis.yml
index 6efcf2d..02c1c6b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,5 +4,6 @@ services:
   - mongodb
 
 rvm:
-  - 2.2.5
-  - 2.3.1
+  - 2.2.6
+  - 2.3.3
+  - 2.4.1