diff --git a/Appraisals b/Appraisals
index 95c6896..2a2ff5c 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,12 +1,5 @@
-appraise "2.7" do
-  gem "capybara", "~> 2.7.0"
-  gem "rspec", "~> 2.14.0"
-  gem 'addressable', '< 2.5.0', :platforms=>[:ruby_19, :jruby_19] # 2.5 requires public_suffix which requires ruby 2.0
-  gem 'nokogiri', '< 1.7.0', :platforms=>[:ruby_19, :jruby_19] # 1.7.0 requires ruby 2.1+
-end
-
-appraise "2.13" do
-  gem "capybara", "~> 2.13.0"
+appraise "2.15" do
+  gem "capybara", "~> 2.15.0"
   gem 'addressable', '< 2.5.0', :platforms=>[:ruby_19, :jruby_19] # 2.5 requires public_suffix which requires ruby 2.0
   gem 'nokogiri', '< 1.7.0', :platforms=>[:ruby_19, :jruby_19] # 1.7.0 requires ruby 2.1+
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index be0261b..7335b09 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,9 +10,10 @@ GEM
   specs:
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    appraisal (0.4.1)
+    appraisal (2.2.0)
       bundler
       rake
+      thor (>= 0.14.0)
     capybara (2.15.4)
       addressable
       mini_mime (>= 0.1.3)
@@ -66,6 +67,7 @@ GEM
       tilt (~> 2.0)
     spoon (0.0.6)
       ffi
+    thor (0.20.0)
     tilt (2.0.8)
     xpath (2.1.0)
       nokogiri (~> 1.3)
@@ -76,7 +78,7 @@ PLATFORMS
   x86-mingw32
 
 DEPENDENCIES
-  appraisal (~> 0.4.0)
+  appraisal
   capybara-webkit!
   json (< 2.0)
   launchy
diff --git a/capybara-webkit.gemspec b/capybara-webkit.gemspec
index 56c91b8..121b344 100644
--- a/capybara-webkit.gemspec
+++ b/capybara-webkit.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency("sinatra")
   s.add_development_dependency("mini_magick")
   s.add_development_dependency("rake", "< 12.0.0")
-  s.add_development_dependency("appraisal", "~> 0.4.0")
+  s.add_development_dependency("appraisal")
   s.add_development_dependency("launchy")
 end
 
diff --git a/gemfiles/2.15.gemfile b/gemfiles/2.15.gemfile
index 41fe5c9..50207ae 100644
--- a/gemfiles/2.15.gemfile
+++ b/gemfiles/2.15.gemfile
@@ -2,10 +2,10 @@
 
 source "https://rubygems.org"
 
-gem "mime-types", "< 3.0", :platforms=>[:ruby_19, :jruby_19]
-gem "json", "< 2.0", :platforms=>[:ruby_19, :jruby_19]
+gem "mime-types", "< 3.0", platforms: [:ruby_19, :jruby_19]
+gem "json", "< 2.0", platforms: [:ruby_19, :jruby_19]
 gem "capybara", "~> 2.15.0"
-gem "addressable", "< 2.5.0", :platforms=>[:ruby_19, :jruby_19]
-gem "nokogiri", "< 1.7.0", :platforms=>[:ruby_19, :jruby_19]
+gem "addressable", "< 2.5.0", platforms: [:ruby_19, :jruby_19]
+gem "nokogiri", "< 1.7.0", platforms: [:ruby_19, :jruby_19]
 
-gemspec :path=>"../"
\ No newline at end of file
+gemspec path: "../"
diff --git a/gemfiles/master.gemfile b/gemfiles/master.gemfile
index 4c50ac0..12bdbbc 100644
--- a/gemfiles/master.gemfile
+++ b/gemfiles/master.gemfile
@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
-gem "mime-types", "< 3.0", :platforms=>[:ruby_19, :jruby_19]
-gem "json", "< 2.0", :platforms=>[:ruby_19, :jruby_19]
-gem "capybara", :github=>"jnicklas/capybara"
+gem "mime-types", "< 3.0", platforms: [:ruby_19, :jruby_19]
+gem "json", "< 2.0", platforms: [:ruby_19, :jruby_19]
+gem "capybara", github: "jnicklas/capybara"
 
-gemspec :path=>"../"
\ No newline at end of file
+gemspec path: "../"