diff --git a/lib/capybara/poltergeist/browser.rb b/lib/capybara/poltergeist/browser.rb
index 6744fe9..b6f0d5a 100644
--- a/lib/capybara/poltergeist/browser.rb
+++ b/lib/capybara/poltergeist/browser.rb
@@ -10,7 +10,8 @@ module Capybara::Poltergeist
       'Poltergeist.FrameNotFound'   => FrameNotFound,
       'Poltergeist.InvalidSelector' => InvalidSelector,
       'Poltergeist.StatusFailError' => StatusFailError,
-      'Poltergeist.NoSuchWindowError' => NoSuchWindowError
+      'Poltergeist.NoSuchWindowError' => NoSuchWindowError,
+      'Poltergeist.UnsupportedFeature' => UnsupportedFeature
     }
 
     attr_reader :server, :client, :logger
@@ -344,6 +345,10 @@ module Capybara::Poltergeist
       command 'set_debug', !!val
     end
 
+    def clear_memory_cache
+      command 'clear_memory_cache'
+    end
+
     def command(name, *args)
       cmd = Command.new(name, *args)
       log cmd.message
diff --git a/lib/capybara/poltergeist/client/browser.coffee b/lib/capybara/poltergeist/client/browser.coffee
index b22859f..11b5ab9 100644
--- a/lib/capybara/poltergeist/client/browser.coffee
+++ b/lib/capybara/poltergeist/client/browser.coffee
@@ -508,3 +508,7 @@ class Poltergeist.Browser
 
   modal_message: ->
     @current_command.sendResponse(@processed_modal_messages.shift())
+
+  clear_memory_cache: ->
+    @currentPage.clearMemoryCache()
+    @current_command.sendResponse(true)
diff --git a/lib/capybara/poltergeist/client/compiled/browser.js b/lib/capybara/poltergeist/client/compiled/browser.js
index 761cfb2..c2ab872 100644
--- a/lib/capybara/poltergeist/client/compiled/browser.js
+++ b/lib/capybara/poltergeist/client/compiled/browser.js
@@ -693,6 +693,11 @@ Poltergeist.Browser = (function() {
     return this.current_command.sendResponse(this.processed_modal_messages.shift());
   };
 
+  Browser.prototype.clear_memory_cache = function() {
+    this.currentPage.clearMemoryCache();
+    return this.current_command.sendResponse(true);
+  };
+
   return Browser;
 
 })();
diff --git a/lib/capybara/poltergeist/client/compiled/main.js b/lib/capybara/poltergeist/client/compiled/main.js
index ca4cc06..6c1a091 100644
--- a/lib/capybara/poltergeist/client/compiled/main.js
+++ b/lib/capybara/poltergeist/client/compiled/main.js
@@ -214,6 +214,23 @@ Poltergeist.NoSuchWindowError = (function(superClass) {
 
 })(Poltergeist.Error);
 
+Poltergeist.UnsupportedFeature = (function(superClass) {
+  extend(UnsupportedFeature, superClass);
+
+  function UnsupportedFeature(message1) {
+    this.message = message1;
+  }
+
+  UnsupportedFeature.prototype.name = "Poltergeist.UnsupportedFeature";
+
+  UnsupportedFeature.prototype.args = function() {
+    return [this.message, phantom.version];
+  };
+
+  return UnsupportedFeature;
+
+})(Poltergeist.Error);
+
 phantom.injectJs(phantom.libraryPath + "/web_page.js");
 
 phantom.injectJs(phantom.libraryPath + "/node.js");
diff --git a/lib/capybara/poltergeist/client/compiled/web_page.js b/lib/capybara/poltergeist/client/compiled/web_page.js
index e39c246..b1c65e5 100644
--- a/lib/capybara/poltergeist/client/compiled/web_page.js
+++ b/lib/capybara/poltergeist/client/compiled/web_page.js
@@ -584,6 +584,16 @@ Poltergeist.WebPage = (function() {
     return parser.href;
   };
 
+  WebPage.prototype.clearMemoryCache = function() {
+    var clearMemoryCache;
+    clearMemoryCache = this["native"]().clearMemoryCache;
+    if (typeof clearMemoryCache === "function") {
+      return clearMemoryCache();
+    } else {
+      throw new Poltergeist.UnsupportedFeature("clearMemoryCache is supported since PhantomJS 2.0.0");
+    }
+  };
+
   return WebPage;
 
 })();
diff --git a/lib/capybara/poltergeist/client/main.coffee b/lib/capybara/poltergeist/client/main.coffee
index f5a49c4..6385f22 100644
--- a/lib/capybara/poltergeist/client/main.coffee
+++ b/lib/capybara/poltergeist/client/main.coffee
@@ -87,6 +87,11 @@ class Poltergeist.NoSuchWindowError extends Poltergeist.Error
   name: "Poltergeist.NoSuchWindowError"
   args: -> []
 
+class Poltergeist.UnsupportedFeature extends Poltergeist.Error
+  constructor: (@message) ->
+  name: "Poltergeist.UnsupportedFeature"
+  args: -> [@message, phantom.version]
+
 # We're using phantom.libraryPath so that any stack traces
 # report the full path.
 phantom.injectJs("#{phantom.libraryPath}/web_page.js")
diff --git a/lib/capybara/poltergeist/client/web_page.coffee b/lib/capybara/poltergeist/client/web_page.coffee
index d8e0d41..53b4055 100644
--- a/lib/capybara/poltergeist/client/web_page.coffee
+++ b/lib/capybara/poltergeist/client/web_page.coffee
@@ -409,3 +409,10 @@ class Poltergeist.WebPage
     parser = document.createElement('a')
     parser.href = url
     return parser.href
+  
+  clearMemoryCache: ->
+    clearMemoryCache = this.native().clearMemoryCache 
+    if typeof clearMemoryCache == "function"
+      clearMemoryCache()
+    else 
+      throw new Poltergeist.UnsupportedFeature("clearMemoryCache is supported since PhantomJS 2.0.0")
diff --git a/lib/capybara/poltergeist/driver.rb b/lib/capybara/poltergeist/driver.rb
index 83a65f0..4461669 100644
--- a/lib/capybara/poltergeist/driver.rb
+++ b/lib/capybara/poltergeist/driver.rb
@@ -279,6 +279,10 @@ module Capybara::Poltergeist
       browser.cookies_enabled = flag
     end
 
+    def clear_memory_cache
+      browser.clear_memory_cache
+    end
+
     # * PhantomJS with set settings doesn't send `Authorize` on POST request
     # * With manually set header PhantomJS makes next request with
     # `Authorization: Basic Og==` header when settings are empty and the
diff --git a/lib/capybara/poltergeist/errors.rb b/lib/capybara/poltergeist/errors.rb
index c98543a..6b6f7ae 100644
--- a/lib/capybara/poltergeist/errors.rb
+++ b/lib/capybara/poltergeist/errors.rb
@@ -115,6 +115,24 @@ module Capybara
       end
     end
 
+    class UnsupportedFeature < ClientError
+      def name
+        response['name']
+      end
+
+      def unsupported_message
+        response['args'][0]
+      end
+
+      def version
+        response['args'][1].values_at(*%w(major minor patch)).join '.'
+      end
+
+      def message
+        "Running version of PhantomJS #{version} does not support some feature: #{unsupported_message}"
+      end
+    end
+
     class MouseEventFailed < NodeError
       def name
         response['args'][0]
diff --git a/spec/integration/driver_spec.rb b/spec/integration/driver_spec.rb
index 4869684..7fbfb5d 100644
--- a/spec/integration/driver_spec.rb
+++ b/spec/integration/driver_spec.rb
@@ -16,6 +16,12 @@ module Capybara::Poltergeist
       "http://#{server.host}:#{server.port}#{path}"
     end
 
+    def phantom_version_is?(version_to_match)
+      (@phantom_version_matches ||= Hash.new { |hash, ver_spec|
+             hash[ver_spec] = Cliver.detect(@driver.options[:phantomjs] || Client::PHANTOMJS_NAME, ver_spec) }
+      )[version_to_match]
+    end
+
     it 'supports a custom phantomjs path' do
       begin
         file = POLTERGEIST_ROOT + '/spec/support/custom_phantomjs_called'
@@ -577,6 +583,48 @@ module Capybara::Poltergeist
       end
     end
 
+    context "memory cache clearing" do
+
+      before do
+        @driver.restart
+      end
+
+      it "can clear memory cache when supported (phantomjs >=2.0.0)" do
+        skip "clear_memory_cache is not supported by tested PhantomJS" unless phantom_version_is? ">= 2.0.0"
+
+        @driver.clear_memory_cache
+
+        @session.visit('/poltergeist/cacheable')
+        first_request = @driver.network_traffic.last
+        expect(@driver.network_traffic.length).to eq(1)
+        expect(first_request.response_parts.last.status).to eq(200)
+
+        @session.visit('/poltergeist/cacheable')
+        expect(@driver.network_traffic.length).to eq(1)
+
+        @driver.clear_memory_cache
+
+        @session.visit('/poltergeist/cacheable')
+        another_request = @driver.network_traffic.last
+        expect(@driver.network_traffic.length).to eq(2)
+        expect(another_request.response_parts.last.status).to eq(200)
+      end
+
+      it "raises error when it is unsupported (phantomjs <2.0.0)" do
+        skip "clear_memory_cache is supported by tested PhantomJS" if phantom_version_is? ">= 2.0.0"
+
+        @session.visit('/poltergeist/cacheable')
+        first_request = @driver.network_traffic.last
+        expect(@driver.network_traffic.length).to eq(1)
+        expect(first_request.response_parts.last.status).to eq(200)
+
+        expect{@driver.clear_memory_cache}.to raise_error(Capybara::Poltergeist::UnsupportedFeature)
+
+        @session.visit('/poltergeist/cacheable')
+        expect(@driver.network_traffic.length).to eq(2)
+      end
+    end
+
     context 'status code support' do
       it 'determines status from the simple response' do
         @session.visit('/poltergeist/status/500')
diff --git a/spec/support/test_app.rb b/spec/support/test_app.rb
index ed5fdc7..a71cdda 100644
--- a/spec/support/test_app.rb
+++ b/spec/support/test_app.rb
@@ -69,6 +69,12 @@ class TestApp
     'Authorized POST request'
   end
 
+  get '/poltergeist/cacheable' do
+    cache_control :public, max_age: 60
+    etag "deadbeef"
+    'Cacheable request'
+  end
+
   get '/poltergeist/:view' do |view|
     render_view view
   end