diff --git a/.rubocop.yml b/.rubocop.yml
index 3ad1692..ebf393b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,6 +1,6 @@
 AllCops:
   DisabledByDefault: true
-  TargetRubyVersion: 2.3
+  TargetRubyVersion: 2.4
 
 #################### Lint ################################
 
diff --git a/.travis.yml b/.travis.yml
index 6062a48..28cc08c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,10 @@ cache: bundler
 
 matrix:
   include:
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails42.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails5.gemfile
     - rvm: 2.3.3
       gemfile: gemfiles/rails42.gemfile
     - rvm: 2.3.3