diff --git a/Gemfile b/Gemfile
index ef78622c..4299c72e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,7 +13,6 @@ gem 'rake', '~> 10.1'
 gem 'rdoc', '~> 3.11'
 gem 'redgreen', '~> 1.2'
 gem 'shoulda', '~> 3.5'
-gem 'rr', '~> 1.1'
 gem 'cucumber', '1.3.18'
 gem 'maruku', '~> 0.7.0'
 gem 'rdiscount', '~> 2.0'
@@ -28,6 +27,7 @@ gem 'minitest'
 gem 'minitest-reporters'
 gem 'minitest-profile'
 gem 'test-unit' if RUBY_PLATFORM =~ /cygwin/ || RUBY_VERSION.start_with?("2.2")
+gem 'rspec-mocks'
 
 if ENV['BENCHMARK']
   gem 'rbtrace'
diff --git a/features/support/env.rb b/features/support/env.rb
index 8f33ff63..43d74ab9 100644
--- a/features/support/env.rb
+++ b/features/support/env.rb
@@ -1,6 +1,5 @@
 require 'fileutils'
 require 'posix-spawn'
-require 'rr'
 require 'minitest/assertions'
 require 'time'
 
diff --git a/test/helper.rb b/test/helper.rb
index e4a50db0..9c5a1eb0 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -11,6 +11,7 @@ require 'ostruct'
 require 'minitest/autorun'
 require 'minitest/reporters'
 require 'minitest/profile'
+require 'rspec/mocks'
 
 require 'jekyll'
 
@@ -19,7 +20,6 @@ require 'kramdown'
 require 'redcarpet'
 
 require 'shoulda'
-require 'rr'
 
 include Jekyll
 
@@ -30,6 +30,20 @@ STDERR.reopen(test(?e, '/dev/null') ? '/dev/null' : 'NUL:')
 Minitest::Reporters.use! [Minitest::Reporters::DefaultReporter.new(:color => true)]
 
 class JekyllUnitTest < Minitest::Test
+  include ::RSpec::Mocks::ExampleMethods
+
+  def before_setup
+    ::RSpec::Mocks.setup
+    super
+  end
+
+  def after_teardown
+    super
+    ::RSpec::Mocks.verify
+  ensure
+    ::RSpec::Mocks.teardown
+  end
+
   def fixture_site(overrides = {})
     Jekyll::Site.new(site_configuration(overrides))
   end
diff --git a/test/test_command.rb b/test/test_command.rb
index fb9e247b..f7c3e237 100644
--- a/test/test_command.rb
+++ b/test/test_command.rb
@@ -4,7 +4,7 @@ class TestCommand < JekyllUnitTest
   context "when calling .add_build_options" do
     should "add common options" do
       cmd = Object.new
-      mock(cmd).option.with_any_args.at_least(1)
+      expect(cmd).to receive(:option).at_least(:once)
       Command.add_build_options(cmd)
     end
   end
@@ -12,7 +12,7 @@ class TestCommand < JekyllUnitTest
     context "when fatal error occurs" do
       should "exit with non-zero error code" do
         site = Object.new
-        stub(site).process { raise Jekyll::Errors::FatalException }
+        def site.process; raise Jekyll::Errors::FatalException; end
         error = assert_raises(SystemExit) { Command.process_site(site) }
         refute_equal 0, error.status
       end
diff --git a/test/test_configuration.rb b/test/test_configuration.rb
index 8de8ac29..ce54223c 100644
--- a/test/test_configuration.rb
+++ b/test/test_configuration.rb
@@ -42,12 +42,12 @@ class TestConfiguration < JekyllUnitTest
       assert_equal [source_dir("_config.yml")], @config.config_files(@no_override)
     end
     should "return .yaml if it exists but .yml does not" do
-      mock(File).exist?(source_dir("_config.yml")) { false }
-      mock(File).exist?(source_dir("_config.yaml")) { true }
+      allow(File).to receive(:exist?).with(source_dir("_config.yml")).and_return(false)
+      allow(File).to receive(:exist?).with(source_dir("_config.yaml")).and_return(true)
       assert_equal [source_dir("_config.yaml")], @config.config_files(@no_override)
     end
     should "return .yml if both .yml and .yaml exist" do
-      mock(File).exist?(source_dir("_config.yml")) { true }
+      allow(File).to receive(:exist?).with(source_dir("_config.yml")).and_return(true)
       assert_equal [source_dir("_config.yml")], @config.config_files(@no_override)
     end
     should "return the config if given one config file" do
@@ -115,27 +115,27 @@ class TestConfiguration < JekyllUnitTest
     end
 
     should "fire warning with no _config.yml" do
-      mock(SafeYAML).load_file(@path) { raise SystemCallError, "No such file or directory - #{@path}" }
-      mock($stderr).puts("Configuration file: none".yellow)
+      allow(SafeYAML).to receive(:load_file).with(@path) { raise SystemCallError, "No such file or directory - #{@path}" }
+      allow($stderr).to receive(:puts).with("Configuration file: none".yellow)
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({})
     end
 
     should "load configuration as hash" do
-      mock(SafeYAML).load_file(@path) { Hash.new }
-      mock($stdout).puts("Configuration file: #{@path}")
+      allow(SafeYAML).to receive(:load_file).with(@path).and_return(Hash.new)
+      allow($stdout).to receive(:puts).with("Configuration file: #{@path}")
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({})
     end
 
     should "fire warning with bad config" do
-      mock(SafeYAML).load_file(@path) { Array.new }
-      mock($stderr).puts(("WARNING: ".rjust(20) + "Error reading configuration. Using defaults (and options).").yellow)
-      mock($stderr).puts("Configuration file: (INVALID) #{@path}".yellow)
+      allow(SafeYAML).to receive(:load_file).with(@path).and_return(Array.new)
+      allow($stderr).to receive(:puts).and_return(("WARNING: ".rjust(20) + "Error reading configuration. Using defaults (and options).").yellow)
+      allow($stderr).to receive(:puts).and_return("Configuration file: (INVALID) #{@path}".yellow)
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({})
     end
 
     should "fire warning when user-specified config file isn't there" do
-      mock(SafeYAML).load_file(@user_config) { raise SystemCallError, "No such file or directory - #{@user_config}" }
-      mock($stderr).puts(("Fatal: ".rjust(20) + "The configuration file '#{@user_config}' could not be found.").red)
+      allow(SafeYAML).to receive(:load_file).with(@user_config) { raise SystemCallError, "No such file or directory - #{@user_config}" }
+      allow($stderr).to receive(:puts).with(("Fatal: ".rjust(20) + "The configuration file '#{@user_config}' could not be found.").red)
       assert_raises LoadError do
         Jekyll.configuration({'config' => [@user_config]})
       end
@@ -157,20 +157,20 @@ class TestConfiguration < JekyllUnitTest
     end
 
     should "load default config if no config_file is set" do
-      mock(SafeYAML).load_file(@paths[:default]) { Hash.new }
-      mock($stdout).puts("Configuration file: #{@paths[:default]}")
+      allow(SafeYAML).to receive(:load_file).with(@paths[:default]).and_return({})
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:default]}")
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({})
     end
 
     should "load different config if specified" do
-      mock(SafeYAML).load_file(@paths[:other]) { {"baseurl" => "http://wahoo.dev"} }
-      mock($stdout).puts("Configuration file: #{@paths[:other]}")
+      allow(SafeYAML).to receive(:load_file).with(@paths[:other]).and_return({"baseurl" => "http://wahoo.dev"})
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:other]}")
       assert_equal Utils.deep_merge_hashes(Jekyll::Configuration::DEFAULTS, { "baseurl" => "http://wahoo.dev" }), Jekyll.configuration({ "config" => @paths[:other] })
     end
 
     should "load default config if path passed is empty" do
-      mock(SafeYAML).load_file(@paths[:default]) { Hash.new }
-      mock($stdout).puts("Configuration file: #{@paths[:default]}")
+      allow(SafeYAML).to receive(:load_file).with(@paths[:default]).and_return({})
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:default]}")
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({ "config" => @paths[:empty] })
     end
 
@@ -183,20 +183,20 @@ class TestConfiguration < JekyllUnitTest
     should "load multiple config files" do
       External.require_with_graceful_fail('toml')
 
-      mock(SafeYAML).load_file(@paths[:default]) { Hash.new }
-      mock(SafeYAML).load_file(@paths[:other]) { Hash.new }
-      mock(TOML).load_file(@paths[:toml]) { Hash.new }
-      mock($stdout).puts("Configuration file: #{@paths[:default]}")
-      mock($stdout).puts("Configuration file: #{@paths[:other]}")
-      mock($stdout).puts("Configuration file: #{@paths[:toml]}")
+      allow(SafeYAML).to receive(:load_file).with(@paths[:default]).and_return(Hash.new)
+      allow(SafeYAML).to receive(:load_file).with(@paths[:other]).and_return(Hash.new)
+      allow(TOML).to receive(:load_file).with(@paths[:toml]).and_return(Hash.new)
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:default]}")
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:other]}")
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:toml]}")
       assert_equal Jekyll::Configuration::DEFAULTS, Jekyll.configuration({ "config" => [@paths[:default], @paths[:other], @paths[:toml]] })
     end
 
     should "load multiple config files and last config should win" do
-      mock(SafeYAML).load_file(@paths[:default]) { {"baseurl" => "http://example.dev"} }
-      mock(SafeYAML).load_file(@paths[:other]) { {"baseurl" => "http://wahoo.dev"} }
-      mock($stdout).puts("Configuration file: #{@paths[:default]}")
-      mock($stdout).puts("Configuration file: #{@paths[:other]}")
+      allow(SafeYAML).to receive(:load_file).with(@paths[:default]).and_return({"baseurl" => "http://example.dev"})
+      allow(SafeYAML).to receive(:load_file).with(@paths[:other]).and_return({"baseurl" => "http://wahoo.dev"})
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:default]}")
+      allow($stdout).to receive(:puts).with("Configuration file: #{@paths[:other]}")
       assert_equal Utils.deep_merge_hashes(Jekyll::Configuration::DEFAULTS, { "baseurl" => "http://wahoo.dev" }), Jekyll.configuration({ "config" => [@paths[:default], @paths[:other]] })
     end
   end
diff --git a/test/test_entry_filter.rb b/test/test_entry_filter.rb
index e3a7e8c0..e5a5dc66 100644
--- a/test/test_entry_filter.rb
+++ b/test/test_entry_filter.rb
@@ -48,13 +48,13 @@ class TestEntryFilter < JekyllUnitTest
 
     should "filter symlink entries when safe mode enabled" do
       site = Site.new(site_configuration('safe' => true))
-      stub(File).symlink?('symlink.js') {true}
+      allow(File).to receive(:symlink?).with('symlink.js').and_return(true)
       files = %w[symlink.js]
       assert_equal [], site.filter_entries(files)
     end
 
     should "not filter symlink entries when safe mode disabled" do
-      stub(File).symlink?('symlink.js') {true}
+      allow(File).to receive(:symlink?).with('symlink.js').and_return(true)
       files = %w[symlink.js]
       assert_equal files, @site.filter_entries(files)
     end
diff --git a/test/test_generated_site.rb b/test/test_generated_site.rb
index 519b8f3a..b3fe811f 100644
--- a/test/test_generated_site.rb
+++ b/test/test_generated_site.rb
@@ -4,11 +4,9 @@ class TestGeneratedSite < JekyllUnitTest
   context "generated sites" do
     setup do
       clear_dest
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir})
-      end
+      config = Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir})
 
-      @site = Site.new(Jekyll.configuration)
+      @site = fixture_site config
       @site.process
       @index = File.read(dest_dir('index.html'))
     end
@@ -59,11 +57,8 @@ OUTPUT
   context "generating limited posts" do
     setup do
       clear_dest
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => 5})
-      end
-
-      @site = Site.new(Jekyll.configuration)
+      config = Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => 5})
+      @site = fixture_site config
       @site.process
       @index = File.read(dest_dir('index.html'))
     end
@@ -75,21 +70,17 @@ OUTPUT
     should "ensure limit posts is 0 or more" do
       assert_raises ArgumentError do
         clear_dest
-        stub(Jekyll).configuration do
-          Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => -1})
-        end
+        config = Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => -1})
 
-        @site = Site.new(Jekyll.configuration)
+        @site = fixture_site config
       end
     end
 
     should "acceptable limit post is 0" do
       clear_dest
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => 0})
-      end
+      config = Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir, 'limit_posts' => 0})
 
-      assert Site.new(Jekyll.configuration), "Couldn't create a site with the given limit_posts."
+      assert Site.new(config), "Couldn't create a site with the given limit_posts."
     end
   end
 end
diff --git a/test/test_layout_reader.rb b/test/test_layout_reader.rb
index fc2f1fc3..88f35220 100644
--- a/test/test_layout_reader.rb
+++ b/test/test_layout_reader.rb
@@ -3,10 +3,8 @@ require 'helper'
 class TestLayoutReader < JekyllUnitTest
   context "reading layouts" do
     setup do
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir})
-      end
-      @site = Site.new(Jekyll.configuration)
+      config = Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir})
+      @site = fixture_site config
     end
 
     should "read layouts" do
@@ -22,8 +20,8 @@ class TestLayoutReader < JekyllUnitTest
 
     context "when a _layouts directory exists in CWD" do
       setup do
-        stub(File).directory? { true }
-        stub(Dir).pwd { source_dir("blah") }
+        allow(File).to receive(:directory?).and_return(true)
+        allow(Dir).to receive(:pwd).and_return(source_dir("blah"))
       end
 
       should "know to use the layout directory relative to CWD" do
diff --git a/test/test_log_adapter.rb b/test/test_log_adapter.rb
index 99b243bc..dee5df3e 100644
--- a/test/test_log_adapter.rb
+++ b/test/test_log_adapter.rb
@@ -22,7 +22,7 @@ class TestLogAdapter < JekyllUnitTest
     should "call #debug on writer return true" do
       writer = LoggerDouble.new
       logger = Jekyll::LogAdapter.new(writer)
-      stub(writer).debug('topic '.rjust(20) + 'log message') { true }
+      allow(writer).to receive(:debug).with('topic '.rjust(20) + 'log message').and_return(true)
       assert logger.debug('topic', 'log message')
     end
   end
@@ -31,7 +31,7 @@ class TestLogAdapter < JekyllUnitTest
     should "call #info on writer return true" do
       writer = LoggerDouble.new
       logger = Jekyll::LogAdapter.new(writer)
-      stub(writer).info('topic '.rjust(20) + 'log message') { true }
+      allow(writer).to receive(:info).with('topic '.rjust(20) + 'log message').and_return(true)
       assert logger.info('topic', 'log message')
     end
   end
@@ -40,7 +40,7 @@ class TestLogAdapter < JekyllUnitTest
     should "call #warn on writer return true" do
       writer = LoggerDouble.new
       logger = Jekyll::LogAdapter.new(writer)
-      stub(writer).warn('topic '.rjust(20) + 'log message') { true }
+      allow(writer).to receive(:warn).with('topic '.rjust(20) + 'log message').and_return(true)
       assert logger.warn('topic', 'log message')
     end
   end
@@ -49,7 +49,7 @@ class TestLogAdapter < JekyllUnitTest
     should "call #error on writer return true" do
       writer = LoggerDouble.new
       logger = Jekyll::LogAdapter.new(writer)
-      stub(writer).error('topic '.rjust(20) + 'log message') { true }
+      allow(writer).to receive(:error).with('topic '.rjust(20) + 'log message').and_return(true)
       assert logger.error('topic', 'log message')
     end
   end
@@ -57,7 +57,7 @@ class TestLogAdapter < JekyllUnitTest
   context "#abort_with" do
     should "call #error and abort" do
       logger = Jekyll::LogAdapter.new(LoggerDouble.new)
-      stub(logger).error('topic', 'log message') { true }
+      allow(logger).to receive(:error).with('topic', 'log message').and_return(true)
       assert_raises(SystemExit) { logger.abort_with('topic', 'log message') }
     end
   end
diff --git a/test/test_new_command.rb b/test/test_new_command.rb
index 2e0fd45c..7321b462 100644
--- a/test/test_new_command.rb
+++ b/test/test_new_command.rb
@@ -55,7 +55,7 @@ class TestNewCommand < JekyllUnitTest
       end
 
       stubbed_date = '2013-01-01'
-      stub.instance_of(Time).strftime { stubbed_date }
+      allow_any_instance_of(Time).to receive(:strftime) { stubbed_date }
 
       erb_template_files.each do |f|
         f.chomp! '.erb'
diff --git a/test/test_path_sanitization.rb b/test/test_path_sanitization.rb
index 2a3182e3..b04a2bad 100644
--- a/test/test_path_sanitization.rb
+++ b/test/test_path_sanitization.rb
@@ -5,7 +5,7 @@ class TestPathSanitization < JekyllUnitTest
     setup do
       @source = "C:/Users/xmr/Desktop/mpc-hc.org"
       @dest   = "./_site/"
-      stub(Dir).pwd { "C:/Users/xmr/Desktop/mpc-hc.org" }
+      allow(Dir).to receive(:pwd).and_return("C:/Users/xmr/Desktop/mpc-hc.org")
     end
     should "strip drive name from path" do
       assert_equal "C:/Users/xmr/Desktop/mpc-hc.org/_site", Jekyll.sanitized_path(@source, @dest)
diff --git a/test/test_related_posts.rb b/test/test_related_posts.rb
index 645f2bfb..42c58279 100644
--- a/test/test_related_posts.rb
+++ b/test/test_related_posts.rb
@@ -3,11 +3,7 @@ require 'helper'
 class TestRelatedPosts < JekyllUnitTest
   context "building related posts without lsi" do
     setup do
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir,
-                                               'destination' => dest_dir})
-      end
-      @site = Site.new(Jekyll.configuration)
+      @site = fixture_site
     end
 
     should "use the most recent posts for related posts" do
@@ -24,23 +20,17 @@ class TestRelatedPosts < JekyllUnitTest
 
   context "building related posts with lsi" do
     setup do
-      stub(Jekyll).configuration do
-        Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir,
-                                               'destination' => dest_dir,
-                                               'lsi' => true})
-      end
-      any_instance_of(Jekyll::RelatedPosts) { |i| stub(i).display }
-      @site = Site.new(Jekyll.configuration)
+      allow_any_instance_of(Jekyll::RelatedPosts).to receive(:display)
+      @site = fixture_site({"lsi" => true})
     end
 
     should "use lsi for the related posts" do
       @site.reset
       @site.read
       require 'classifier-reborn'
-      any_instance_of(::ClassifierReborn::LSI) do |c|
-        stub(c).find_related { @site.posts[-1..-9] }
-        stub(c).build_index
-      end
+      allow_any_instance_of(::ClassifierReborn::LSI).to receive(:find_related).and_return(@site.posts[-1..-9])
+      allow_any_instance_of(::ClassifierReborn::LSI).to receive(:build_index)
+
       assert_equal @site.posts[-1..-9], Jekyll::RelatedPosts.new(@site.posts.last).build
     end
   end
diff --git a/test/test_site.rb b/test/test_site.rb
index 76ce9ce1..4bc7ddb2 100644
--- a/test/test_site.rb
+++ b/test/test_site.rb
@@ -162,7 +162,8 @@ class TestSite < JekyllUnitTest
     end
 
     should "sort pages alphabetically" do
-      stub.proxy(Dir).entries { |entries| entries.reverse }
+      method = Dir.method(:entries)
+      allow(Dir).to receive(:entries) { |*args, &block| method.call(*args, &block).reverse }
       @site.process
       # files in symlinked directories may appear twice
       sorted_pages = %w(
diff --git a/test/test_tags.rb b/test/test_tags.rb
index 4db4ab85..0460f3f6 100644
--- a/test/test_tags.rb
+++ b/test/test_tags.rb
@@ -5,12 +5,7 @@ require 'helper'
 class TestTags < JekyllUnitTest
 
   def create_post(content, override = {}, converter_class = Jekyll::Converters::Markdown)
-    stub(Jekyll).configuration do
-      site_configuration({
-        "highlighter" => "rouge"
-      }.merge(override))
-    end
-    site = Site.new(Jekyll.configuration)
+    site = fixture_site({"highlighter" => "rouge"}.merge(override))
 
     if override['read_posts']
       site.read_posts('')
@@ -645,11 +640,7 @@ CONTENT
 
     context "include tag with variable and liquid filters" do
       setup do
-        stub(Jekyll).configuration do
-          site_configuration({'pygments' => true})
-        end
-
-        site = Site.new(Jekyll.configuration)
+        site = fixture_site({'pygments' => true})
         post = Post.new(site, source_dir, '', "2013-12-17-include-variable-filters.markdown")
         layouts = { "default" => Layout.new(site, source_dir('_layouts'), "simple.html")}
         post.render(layouts, {"site" => {"posts" => []}})
@@ -681,11 +672,7 @@ CONTENT
 
   context "relative include tag with variable and liquid filters" do
     setup do
-      stub(Jekyll).configuration do
-        site_configuration({'pygments' => true})
-      end
-
-      site = Site.new(Jekyll.configuration)
+      site = fixture_site('pygments' => true)
       post = Post.new(site, source_dir, '', "2014-09-02-relative-includes.markdown")
       layouts = { "default" => Layout.new(site, source_dir('_layouts'), "simple.html")}
       post.render(layouts, {"site" => {"posts" => []}})