.travis.yml in validates_timeliness-5.0.0.alpha3 vs .travis.yml in validates_timeliness-5.0.0.alpha4

@@ -6,10 +6,10 @@
   - gemfiles/rails_5_0.gemfile
   - gemfiles/rails_5_1.gemfile
   - gemfiles/rails_5_2.gemfile
 
 rvm:
-  - "2.5.1"
+  - "2.5.3"
 
 script: 'bundle exec rspec'
 
 notifications:
   email: