diff --git a/.rubocop.yml b/.rubocop.yml
index 43c5fb3d..391a22ef 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -5,8 +5,6 @@ AllCops:
   - tmp/**/*
 HandleExceptions:
   Enabled: false
-NonNilCheck:
-  Enabled: false
 PercentLiteralDelimiters:
   PreferredDelimiters:
     '%W': '[]'
diff --git a/README.md b/README.md
index a6277eaf..5b7207f4 100644
--- a/README.md
+++ b/README.md
@@ -285,7 +285,7 @@ work done in [Mutations][17].
   [2]: https://badge.fury.io/rb/active_interaction "Gem Version"
   [3]: https://travis-ci.org/orgsync/active_interaction.svg?branch=master
   [4]: https://travis-ci.org/orgsync/active_interaction "Build Status"
-  [5]: https://coveralls.io/repos/orgsync/active_interaction/badge.png?branch=master
+  [5]: http://img.shields.io/coveralls/orgsync/active_interaction/master.svg
   [6]: https://coveralls.io/r/orgsync/active_interaction?branch=master "Coverage Status"
   [7]: https://codeclimate.com/github/orgsync/active_interaction.png
   [8]: https://codeclimate.com/github/orgsync/active_interaction "Code Climate"
diff --git a/active_interaction.gemspec b/active_interaction.gemspec
index 242d4922..93183860 100644
--- a/active_interaction.gemspec
+++ b/active_interaction.gemspec
@@ -35,7 +35,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'guard-rubocop', '~> 1.1'
   spec.add_development_dependency 'rake', '~> 10.3'
   spec.add_development_dependency 'rdoc', '~> 4.1'
-  spec.add_development_dependency 'rubocop', '0.21.0'
+  spec.add_development_dependency 'rubocop', '0.22.0'
   spec.add_development_dependency 'yard', '~> 0.8'
 
   if RUBY_ENGINE == 'rbx'
diff --git a/lib/active_interaction/errors.rb b/lib/active_interaction/errors.rb
index 75d4cd91..ebbd3a3c 100644
--- a/lib/active_interaction/errors.rb
+++ b/lib/active_interaction/errors.rb
@@ -171,9 +171,9 @@ def merge_messages!(other)
     def merge_symbolic!(other)
       other.symbolic.each do |attribute, symbols|
         symbols.each do |symbol|
-          unless symbolic[attribute].include?(symbol)
-            symbolic[attribute] += [symbol]
-          end
+          next if symbolic[attribute].include?(symbol)
+
+          symbolic[attribute] += [symbol]
         end
       end
     end
diff --git a/lib/active_interaction/filters/array_filter.rb b/lib/active_interaction/filters/array_filter.rb
index 624166c9..98ed4e1c 100644
--- a/lib/active_interaction/filters/array_filter.rb
+++ b/lib/active_interaction/filters/array_filter.rb
@@ -64,9 +64,11 @@ def validate(filter, names)
         fail InvalidFilterError, 'attribute names in array block'
       end
 
+      # rubocop:disable GuardClause
       if filter.default?
         fail InvalidDefaultError, 'default values in array block'
       end
+      # rubocop:enable GuardClause
     end
   end
 end