diff --git a/Gemfile.lock b/Gemfile.lock
index e596245..8773e50 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,31 +8,31 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    actionpack (5.1.6)
-      actionview (= 5.1.6)
-      activesupport (= 5.1.6)
+    actionpack (5.2.1)
+      actionview (= 5.2.1)
+      activesupport (= 5.2.1)
       rack (~> 2.0)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.2)
-    actionview (5.1.6)
-      activesupport (= 5.1.6)
+    actionview (5.2.1)
+      activesupport (= 5.2.1)
       builder (~> 3.1)
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.0, >= 1.0.3)
-    activemodel (5.1.6)
-      activesupport (= 5.1.6)
-    activerecord (5.1.6)
-      activemodel (= 5.1.6)
-      activesupport (= 5.1.6)
-      arel (~> 8.0)
-    activerecord-jdbc-adapter (51.1-java)
-      activerecord (~> 5.1.0)
-    activerecord-jdbcsqlite3-adapter (51.1-java)
-      activerecord-jdbc-adapter (= 51.1)
+    activemodel (5.2.1)
+      activesupport (= 5.2.1)
+    activerecord (5.2.1)
+      activemodel (= 5.2.1)
+      activesupport (= 5.2.1)
+      arel (>= 9.0)
+    activerecord-jdbc-adapter (52.1-java)
+      activerecord (~> 5.2.0)
+    activerecord-jdbcsqlite3-adapter (52.1-java)
+      activerecord-jdbc-adapter (= 52.1)
       jdbc-sqlite3 (~> 3.8, < 3.30)
-    activesupport (5.1.6)
+    activesupport (5.2.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
@@ -41,7 +41,7 @@ GEM
       bundler
       rake
       thor (>= 0.14.0)
-    arel (8.0.0)
+    arel (9.0.0)
     aruba (0.14.6)
       childprocess (>= 0.6.3, < 0.10.0)
       contracts (~> 0.9)
@@ -60,8 +60,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
-    concurrent-ruby (1.0.5-java)
+    concurrent-ruby (1.1.0)
     contracts (0.16.0)
     crass (1.0.4)
     cucumber (1.3.19)
@@ -81,7 +80,7 @@ GEM
       multi_json (~> 1.3)
     gherkin (2.12.2-java)
       multi_json (~> 1.3)
-    i18n (1.0.1)
+    i18n (1.1.1)
       concurrent-ruby (~> 1.0)
     jdbc-sqlite3 (3.20.1)
     jquery-rails (4.3.3)
@@ -89,7 +88,7 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     jruby-openssl (0.10.1-java)
-    loofah (2.2.2)
+    loofah (2.2.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     method_source (0.9.0)
@@ -97,11 +96,11 @@ GEM
     minitest (5.11.3)
     multi_json (1.13.1)
     multi_test (0.1.2)
-    nokogiri (1.8.4)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
-    nokogiri (1.8.4-java)
+    nokogiri (1.8.5-java)
     parallel (1.12.1)
-    parser (2.5.1.2)
+    parser (2.5.3.0)
       ast (~> 2.4.0)
     power_assert (1.1.3)
     powerpack (0.1.2)
@@ -113,31 +112,31 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.0.4)
       loofah (~> 2.2, >= 2.2.2)
-    railties (5.1.6)
-      actionpack (= 5.1.6)
-      activesupport (= 5.1.6)
+    railties (5.2.1)
+      actionpack (= 5.2.1)
+      activesupport (= 5.2.1)
       method_source
       rake (>= 0.8.7)
-      thor (>= 0.18.1, < 2.0)
+      thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (12.3.1)
-    rspec-core (3.7.1)
-      rspec-support (~> 3.7.0)
-    rspec-expectations (3.7.0)
+    rspec-core (3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-expectations (3.8.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-mocks (3.7.0)
+      rspec-support (~> 3.8.0)
+    rspec-mocks (3.8.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-rails (3.7.2)
+      rspec-support (~> 3.8.0)
+    rspec-rails (3.8.1)
       actionpack (>= 3.0)
       activesupport (>= 3.0)
       railties (>= 3.0)
-      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.7.0)
-      rspec-support (~> 3.7.0)
-    rspec-support (3.7.1)
+      rspec-core (~> 3.8.0)
+      rspec-expectations (~> 3.8.0)
+      rspec-mocks (~> 3.8.0)
+      rspec-support (~> 3.8.0)
+    rspec-support (3.8.0)
     rubocop (0.54.0)
       parallel (~> 1.10)
       parser (>= 2.5)
@@ -157,7 +156,7 @@ GEM
     thread_safe (0.3.6-java)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.16)
+    uglifier (4.1.19)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.4.0)
 
@@ -184,4 +183,4 @@ DEPENDENCIES
   uglifier
 
 BUNDLED WITH
-   1.16.3
+   1.16.6
diff --git a/Rakefile b/Rakefile
index 80696ea..b7f8bb4 100644
--- a/Rakefile
+++ b/Rakefile
@@ -11,17 +11,5 @@ end
 
 RSpec::Core::RakeTask.new(:spec)
 
-require "appraisal"
-
 desc "Run the test suite"
-task :default do
-  if ENV["BUNDLE_GEMFILE"] =~ /gemfiles/
-    exec "rake spec && rake cucumber"
-  else
-    Rake::Task["appraise"].execute
-  end
-end
-
-task appraise: ["appraisal:install"] do
-  exec "rake appraisal"
-end
+task default: %w(spec cucumber)
diff --git a/gemfiles/rails4.2.gemfile b/gemfiles/rails4.2.gemfile
index d989114..a7c9378 100644
--- a/gemfiles/rails4.2.gemfile
+++ b/gemfiles/rails4.2.gemfile
@@ -9,13 +9,14 @@ gem "cucumber", "1.3.19"
 gem "jquery-rails"
 gem "rake"
 gem "rspec-rails"
-gem "uglifier"
 gem "test-unit"
-gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "jdbc-sqlite3", :platforms => :jruby
-gem "therubyrhino", :platforms => :jruby
-gem "jruby-openssl", :platforms => :jruby
-gem "sqlite3", :platforms => :ruby
+gem "uglifier"
+gem "activerecord-jdbcsqlite3-adapter", platforms: :jruby
+gem "jdbc-sqlite3", platforms: :jruby
+gem "jruby-openssl", platforms: :jruby
+gem "therubyrhino", platforms: :jruby
+gem "sqlite3", platforms: :ruby
+gem "rubocop", "0.54", require: false
 gem "rails", "~> 4.2.0"
 
-gemspec :name => "factory_bot_rails", :path => "../"
+gemspec name: "factory_bot_rails", path: "../"
diff --git a/gemfiles/rails5.0.gemfile b/gemfiles/rails5.0.gemfile
index 668a7aa..15da716 100644
--- a/gemfiles/rails5.0.gemfile
+++ b/gemfiles/rails5.0.gemfile
@@ -9,14 +9,15 @@ gem "cucumber", "1.3.19"
 gem "jquery-rails"
 gem "rake"
 gem "rspec-rails"
-gem "uglifier"
 gem "test-unit"
-gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "jdbc-sqlite3", :platforms => :jruby
-gem "therubyrhino", :platforms => :jruby
-gem "jruby-openssl", :platforms => :jruby
-gem "sqlite3", :platforms => :ruby
+gem "uglifier"
+gem "activerecord-jdbcsqlite3-adapter", platforms: :jruby
+gem "jdbc-sqlite3", platforms: :jruby
+gem "jruby-openssl", platforms: :jruby
+gem "therubyrhino", platforms: :jruby
+gem "sqlite3", platforms: :ruby
+gem "rubocop", "0.54", require: false
 gem "activerecord", "~> 5.0.0"
 gem "railties", "~> 5.0.0"
 
-gemspec :name => "factory_bot_rails", :path => "../"
+gemspec name: "factory_bot_rails", path: "../"
diff --git a/gemfiles/rails5.1.gemfile b/gemfiles/rails5.1.gemfile
index 7ade006..db0320f 100644
--- a/gemfiles/rails5.1.gemfile
+++ b/gemfiles/rails5.1.gemfile
@@ -9,14 +9,15 @@ gem "cucumber", "1.3.19"
 gem "jquery-rails"
 gem "rake"
 gem "rspec-rails"
-gem "uglifier"
 gem "test-unit"
-gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "jdbc-sqlite3", :platforms => :jruby
-gem "therubyrhino", :platforms => :jruby
-gem "jruby-openssl", :platforms => :jruby
-gem "sqlite3", :platforms => :ruby
+gem "uglifier"
+gem "activerecord-jdbcsqlite3-adapter", platforms: :jruby
+gem "jdbc-sqlite3", platforms: :jruby
+gem "jruby-openssl", platforms: :jruby
+gem "therubyrhino", platforms: :jruby
+gem "sqlite3", platforms: :ruby
+gem "rubocop", "0.54", require: false
 gem "activerecord", "~> 5.1.0"
 gem "railties", "~> 5.1.0"
 
-gemspec :name => "factory_bot_rails", :path => "../"
+gemspec name: "factory_bot_rails", path: "../"
diff --git a/gemfiles/rails5.2.gemfile b/gemfiles/rails5.2.gemfile
index e5785fc..df48be5 100644
--- a/gemfiles/rails5.2.gemfile
+++ b/gemfiles/rails5.2.gemfile
@@ -9,14 +9,15 @@ gem "cucumber", "1.3.19"
 gem "jquery-rails"
 gem "rake"
 gem "rspec-rails"
-gem "uglifier"
 gem "test-unit"
-gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
-gem "jdbc-sqlite3", :platforms => :jruby
-gem "therubyrhino", :platforms => :jruby
-gem "jruby-openssl", :platforms => :jruby
-gem "sqlite3", :platforms => :ruby
+gem "uglifier"
+gem "activerecord-jdbcsqlite3-adapter", platforms: :jruby
+gem "jdbc-sqlite3", platforms: :jruby
+gem "jruby-openssl", platforms: :jruby
+gem "therubyrhino", platforms: :jruby
+gem "sqlite3", platforms: :ruby
+gem "rubocop", "0.54", require: false
 gem "activerecord", "~> 5.2.0"
 gem "railties", "~> 5.2.0"
 
-gemspec :name => "factory_bot_rails", :path => "../"
+gemspec name: "factory_bot_rails", path: "../"