diff --git a/.travis.yml b/.travis.yml
index fe68868..0930067 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,6 +7,7 @@ before_install: gem install bundler -v '~> 1.15' --conservative --minimal-deps
 
 rvm:
   - 2.1.10
-  - 2.2.7
-  - 2.3.4
-  - 2.4.1
+  - 2.2.10
+  - 2.3.7
+  - 2.4.4
+  - 2.5.1