diff --git a/Gemfile b/Gemfile
index 7e5012c..b618d4d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,6 @@ gem 'rails'
 gem 'rack'
 gem 'rack-proxy'
 gem 'addressable'
-gem 'cookiejar', '~> 0.3.2'
 
 # Add dependencies to develop your gem here.
 # Include everything needed to run rake, tests, features, etc.
diff --git a/Gemfile.lock b/Gemfile.lock
index ed4e7e3..2b1890a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,6 @@ GEM
     addressable (2.3.8)
     arel (6.0.0)
     builder (3.2.2)
-    cookiejar (0.3.2)
     descendants_tracker (0.0.4)
       thread_safe (~> 0.3, >= 0.3.1)
     docile (1.1.5)
@@ -149,7 +148,6 @@ PLATFORMS
 DEPENDENCIES
   addressable
   bundler (~> 1.0)
-  cookiejar (~> 0.3.2)
   jeweler (~> 2.0.1)
   rack
   rack-proxy
@@ -157,3 +155,6 @@ DEPENDENCIES
   rdoc (~> 3.12)
   shoulda
   simplecov
+
+BUNDLED WITH
+   1.10.6
diff --git a/lib/reverse_proxy/client.rb b/lib/reverse_proxy/client.rb
index 1be21aa..0916da9 100644
--- a/lib/reverse_proxy/client.rb
+++ b/lib/reverse_proxy/client.rb
@@ -1,6 +1,5 @@
 require 'rack'
 require 'rack-proxy'
-require 'cookiejar'
 
 module ReverseProxy
   class Client
@@ -92,11 +91,8 @@ module ReverseProxy
         set_cookies_hash = {}
 
         set_cookie_headers.each do |set_cookie_header|
-          set_cookie_hash = CookieJar::CookieValidation.parse_set_cookie(set_cookie_header)
-          set_cookie_hash[:value] = CGI.unescape(set_cookie_hash[:value])
-
-          name = set_cookie_hash.delete(:name)
-
+          set_cookie_hash = parse_cookie(set_cookie_header)
+          name = set_cookie_hash[:name]
           set_cookies_hash[name] = set_cookie_hash
         end
 
@@ -140,5 +136,40 @@ module ReverseProxy
     def reconstruct_header_name(name)
       name.sub(/^HTTP_/, "").gsub("_", "-")
     end
+
+    COOKIE_PARAM_PATTERN = /\A([^(),\/<>@;:\\\"\[\]?={}\s]+)(?:=([^;]*))?\Z/
+    COOKIE_SPLIT_PATTERN = /;\s*/
+
+    def parse_cookie(cookie_str)
+      params = cookie_str.split(COOKIE_SPLIT_PATTERN)
+      info = params.shift.match(COOKIE_PARAM_PATTERN)
+      return {} unless info
+
+      cookie = {
+        name: info[1],
+        value: CGI.unescape(info[2]),
+      }
+
+      params.each do |param|
+        result = param.match(COOKIE_PARAM_PATTERN)
+        next unless result
+
+        key = result[1].downcase.to_sym
+        value = result[2]
+        case key
+        when :expires
+          begin
+            cookie[:expires] = Time.parse(value)
+          rescue ArgumentError
+          end
+        when *[:httponly, :secure]
+          cookie[key] = true
+        else
+          cookie[key] = value
+        end
+      end
+
+      cookie
+    end
   end
 end