diff --git a/composer.json b/composer.json
index 8090c70d0..86edeba99 100644
--- a/composer.json
+++ b/composer.json
@@ -5,6 +5,12 @@
         "launchdarkly",
         "launchdarkly php"
     ],
+    "repositories": [
+      {
+        "type": "git",
+        "url": "git://github.com/launchdarkly/guzzle3.git"
+      }
+    ],    
     "homepage": "https://github.com/launchdarkly/php-client",
     "license": "Apache-2.0",
     "authors": [
@@ -14,9 +20,8 @@
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     ],
     "require": {
-        "php": ">=5.4",
-        "guzzlehttp/guzzle": "5.*",
-        "guzzlehttp/cache-subscriber": "0.1.*"
+        "php": ">=5.3",
+        "guzzle/guzzle": "dev-master#ecb935d2d0ecd8cddae4dcfb90515cac5e2cb023"
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     "require-dev": {
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diff --git a/composer.lock b/composer.lock
index eff0ac1bc..92a0ae21a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,166 +4,75 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
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-    "content-hash": "6d07711fd3a9d3fb5009b02b6a8cafee",
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-            "version": "v1.4.2",
+            "name": "guzzle/guzzle",
+            "version": "dev-master",
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-                "reference": "8c434000f420ade76a07c64cbe08ca47e5c101ca",
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+                "url": "git://github.com/launchdarkly/guzzle3.git",
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+                "ext-curl": "*",
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+                "symfony/event-dispatcher": "~2.1"
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+                "guzzle/cache": "self.version",
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+                "guzzle/inflection": "self.version",
+                "guzzle/iterator": "self.version",
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+                "guzzle/plugin": "self.version",
+                "guzzle/plugin-async": "self.version",
+                "guzzle/plugin-backoff": "self.version",
+                "guzzle/plugin-cache": "self.version",
+                "guzzle/plugin-cookie": "self.version",
+                "guzzle/plugin-curlauth": "self.version",
+                "guzzle/plugin-error-response": "self.version",
+                "guzzle/plugin-history": "self.version",
+                "guzzle/plugin-log": "self.version",
+                "guzzle/plugin-md5": "self.version",
+                "guzzle/plugin-mock": "self.version",
+                "guzzle/plugin-oauth": "self.version",
+                "guzzle/service": "self.version",
+                "guzzle/stream": "self.version"
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+                "symfony/class-loader": "~2.1",
+                "zendframework/zend-cache": "2.*,<2.3",
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-            "require-dev": {
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+            "suggest": {
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             },
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-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.0-dev"
+                "psr-0": {
+                    "Guzzle": "src/",
+                    "Guzzle\\Tests": "tests/"
                 }
             },
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
-                }
+            "scripts": {
+                "test": [
+                    "phpunit"
+                ]
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-            "notification-url": "https://packagist.org/downloads/",
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@@ -172,151 +81,65 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Guzzle Community",
+                    "homepage": "https://github.com/guzzle/guzzle/contributors"
                 }
             ],
-            "description": "Guzzle is a PHP HTTP client library and framework for building RESTful web service clients",
+            "description": "PHP HTTP client. This library is deprecated in favor of https://packagist.org/packages/guzzlehttp/guzzle",
             "homepage": "http://guzzlephp.org/",
             "keywords": [
+                "HTTP client",
                 "client",
                 "curl",
                 "framework",
                 "http",
-                "http client",
                 "rest",
                 "web service"
             ],
-            "time": "2015-05-20 03:47:55"
+            "time": "2015-12-08 22:41:05"
         },
         {
-            "name": "guzzlehttp/ringphp",
-            "version": "1.1.0",
+            "name": "symfony/event-dispatcher",
+            "version": "v2.8.0",
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-                "url": "https://github.com/guzzle/RingPHP.git",
-                "reference": "dbbb91d7f6c191e5e405e900e3102ac7f261bc0b"
+                "url": "https://github.com/symfony/event-dispatcher.git",
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+                "php": ">=5.3.9"
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             "require-dev": {
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+                "psr/log": "~1.0",
+                "symfony/config": "~2.0,>=2.0.5|~3.0.0",
+                "symfony/dependency-injection": "~2.6|~3.0.0",
+                "symfony/expression-language": "~2.6|~3.0.0",
+                "symfony/stopwatch": "~2.3|~3.0.0"
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+                "symfony/dependency-injection": "",
+                "symfony/http-kernel": ""
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+                    "Symfony\\Component\\EventDispatcher\\": ""
                 },
-                "files": [
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+                "exclude-from-classmap": [
+                    "/Tests/"
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@@ -325,12 +148,17 @@
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-                    "name": "Jan Sorgalla",
-                    "email": "jsorgalla@gmail.com"
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
-            "time": "2015-07-03 13:48:55"
+            "description": "Symfony EventDispatcher Component",
+            "homepage": "https://symfony.com",
+            "time": "2015-10-30 20:15:42"
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@@ -2118,28 +1946,28 @@
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@@ -2162,24 +1990,24 @@
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             ],
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-            "homepage": "http://www.github.com/sebastianbergmann/diff",
+            "homepage": "https://github.com/sebastianbergmann/diff",
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-            "time": "2015-02-22 15:13:53"
+            "time": "2015-12-08 07:14:41"
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-            "version": "1.3.2",
+            "version": "1.3.3",
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@@ -2216,7 +2044,7 @@
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-            "time": "2015-08-03 06:14:51"
+            "time": "2015-12-02 08:37:27"
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@@ -2286,16 +2114,16 @@
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@@ -2335,7 +2163,7 @@
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-            "time": "2015-06-21 08:04:50"
+            "time": "2015-11-11 19:50:13"
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@@ -2374,20 +2202,20 @@
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-            "version": "1.3.1",
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@@ -2416,36 +2244,39 @@
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-            "time": "2015-01-04 21:18:15"
+            "time": "2015-11-21 02:21:41"
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-                }
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+                "php": ">=5.3.9",
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-                "symfony/process": "~2.1"
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@@ -2495,13 +2327,16 @@
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-                }
+                },
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@@ -2519,46 +2354,38 @@
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-            "time": "2015-10-20 14:38:46"
+            "time": "2015-11-30 12:35:10"
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-            "name": "symfony/event-dispatcher",
-            "version": "v2.7.6",
+            "name": "symfony/filesystem",
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-            },
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+                    "dev-master": "2.8-dev"
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-                    "Symfony\\Component\\EventDispatcher\\": ""
-                }
+                    "Symfony\\Component\\Filesystem\\": ""
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@@ -2574,22 +2401,22 @@
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                 }
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-            "description": "Symfony EventDispatcher Component",
+            "description": "Symfony Filesystem Component",
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-            "time": "2015-10-11 09:39:48"
+            "time": "2015-11-23 10:19:46"
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-            "name": "symfony/filesystem",
-            "version": "v2.7.6",
+            "name": "symfony/finder",
+            "version": "v2.8.0",
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-                "url": "https://github.com/symfony/filesystem.git",
-                "reference": "56fd6df73be859323ff97418d97edc1d756df6df"
+                "url": "https://github.com/symfony/finder.git",
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@@ -2598,13 +2425,16 @@
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+                    "dev-master": "2.8-dev"
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             "autoload": {
                 "psr-4": {
-                    "Symfony\\Component\\Filesystem\\": ""
-                }
+                    "Symfony\\Component\\Finder\\": ""
+                },
+                "exclude-from-classmap": [
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@@ -2620,37 +2450,40 @@
                     "homepage": "https://symfony.com/contributors"
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-            "description": "Symfony Filesystem Component",
+            "description": "Symfony Finder Component",
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-            "time": "2015-10-18 20:23:18"
+            "time": "2015-10-30 20:15:42"
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-            "name": "symfony/finder",
-            "version": "v2.7.6",
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.0.0",
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-                "reference": "2ffb4e9598db3c48eb6d0ae73b04bbf09280c59d"
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
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-                    "Symfony\\Component\\Finder\\": ""
-                }
+                    "Symfony\\Polyfill\\Mbstring\\": ""
+                },
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+                ]
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@@ -2658,30 +2491,37 @@
             ],
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-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
                 },
                 {
                     "name": "Symfony Community",
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony Finder Component",
+            "description": "Symfony polyfill for the Mbstring extension",
             "homepage": "https://symfony.com",
-            "time": "2015-10-11 09:39:48"
+            "keywords": [
+                "compatibility",
+                "mbstring",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "time": "2015-11-04 20:28:58"
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-            "version": "v2.7.6",
+            "version": "v2.8.0",
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-                "reference": "4a959dd4e19c2c5d7512689413921e0a74386ec7"
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@@ -2690,13 +2530,16 @@
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+                    "dev-master": "2.8-dev"
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             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\Process\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
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@@ -2714,20 +2557,20 @@
             ],
             "description": "Symfony Process Component",
             "homepage": "https://symfony.com",
-            "time": "2015-10-23 14:47:27"
+            "time": "2015-11-30 12:35:10"
         },
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-            "version": "v2.7.6",
+            "version": "v2.8.0",
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                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "f8ab957c17e4b85a73c4df03bdf94ee597f2bd55"
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-                "reference": "f8ab957c17e4b85a73c4df03bdf94ee597f2bd55",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/5f1e2ebd1044da542d2b9510527836e8be92b1cb",
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@@ -2736,13 +2579,16 @@
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+                    "dev-master": "2.8-dev"
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             },
             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\Stopwatch\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
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             "notification-url": "https://packagist.org/downloads/",
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@@ -2760,33 +2606,34 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2015-10-12 12:42:24"
+            "time": "2015-10-30 20:15:42"
         },
         {
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-            "version": "v2.7.6",
+            "version": "v2.8.0",
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                 "url": "https://github.com/symfony/translation.git",
-                "reference": "6ccd9289ec1c71d01a49d83480de3b5293ce30c8"
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-                "reference": "6ccd9289ec1c71d01a49d83480de3b5293ce30c8",
+                "url": "https://api.github.com/repos/symfony/translation/zipball/6772657767649fc3b31df12705194fb4af11ef98",
+                "reference": "6772657767649fc3b31df12705194fb4af11ef98",
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-                "php": ">=5.3.9"
+                "php": ">=5.3.9",
+                "symfony/polyfill-mbstring": "~1.0"
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             "require-dev": {
                 "psr/log": "~1.0",
-                "symfony/config": "~2.7",
-                "symfony/intl": "~2.4",
-                "symfony/yaml": "~2.2"
+                "symfony/config": "~2.8",
+                "symfony/intl": "~2.4|~3.0.0",
+                "symfony/yaml": "~2.2|~3.0.0"
             },
             "suggest": {
                 "psr/log": "To use logging capability in translator",
@@ -2796,13 +2643,16 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.7-dev"
+                    "dev-master": "2.8-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\Translation\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -2820,37 +2670,36 @@
             ],
             "description": "Symfony Translation Component",
             "homepage": "https://symfony.com",
-            "time": "2015-10-27 15:38:06"
+            "time": "2015-11-18 13:45:00"
         },
         {
             "name": "symfony/validator",
-            "version": "v2.7.6",
+            "version": "v2.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/validator.git",
-                "reference": "df9021e689aa3d08367881e7f8917219fabe5e64"
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-                "reference": "df9021e689aa3d08367881e7f8917219fabe5e64",
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             "require": {
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-                "symfony/translation": "~2.4"
+                "symfony/translation": "~2.4|~3.0.0"
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                 "doctrine/cache": "~1.0",
-                "doctrine/common": "~2.3",
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-                "symfony/config": "~2.2",
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-                "symfony/intl": "~2.4",
-                "symfony/property-access": "~2.3",
-                "symfony/yaml": "~2.0,>=2.0.5"
+                "symfony/config": "~2.2|~3.0.0",
+                "symfony/expression-language": "~2.4|~3.0.0",
+                "symfony/http-foundation": "~2.1|~3.0.0",
+                "symfony/intl": "~2.4|~3.0.0",
+                "symfony/property-access": "~2.3|~3.0.0",
+                "symfony/yaml": "~2.0,>=2.0.5|~3.0.0"
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@@ -2866,13 +2715,16 @@
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+                    "dev-master": "2.8-dev"
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                     "Symfony\\Component\\Validator\\": ""
-                }
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+                ]
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             "notification-url": "https://packagist.org/downloads/",
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@@ -2890,20 +2742,20 @@
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             "description": "Symfony Validator Component",
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-            "time": "2015-10-18 20:23:18"
+            "time": "2015-11-20 14:39:26"
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         {
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-            "version": "v2.7.6",
+            "version": "v2.8.0",
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-                "reference": "eca9019c88fbe250164affd107bc8057771f3f4d"
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@@ -2912,13 +2764,16 @@
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+                    "dev-master": "2.8-dev"
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             },
             "autoload": {
                 "psr-4": {
                     "Symfony\\Component\\Yaml\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
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@@ -2936,20 +2791,20 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2015-10-11 09:39:48"
+            "time": "2015-11-30 12:35:10"
         },
         {
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-            "version": "v1.22.3",
+            "version": "v1.23.1",
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                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "ebfc36b7e77b0c1175afe30459cf943010245540"
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@@ -2962,7 +2817,7 @@
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@@ -2997,7 +2852,7 @@
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-            "time": "2015-10-13 07:07:02"
+            "time": "2015-11-05 12:49:06"
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@@ -3663,11 +3518,13 @@
     ],
     "aliases": [],
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-    "stability-flags": [],
+    "stability-flags": {
+        "guzzle/guzzle": 20
+    },
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     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.4"
+        "php": ">=5.3"
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 }
diff --git a/src/LaunchDarkly/GuzzleFeatureRequester.php b/src/LaunchDarkly/GuzzleFeatureRequester.php
index c6f41bce5..78e6c8954 100644
--- a/src/LaunchDarkly/GuzzleFeatureRequester.php
+++ b/src/LaunchDarkly/GuzzleFeatureRequester.php
@@ -1,34 +1,33 @@
 <?php
 namespace LaunchDarkly;
 
-use GuzzleHttp\Client;
-use \GuzzleHttp\Exception\BadResponseException;
-use \GuzzleHttp\Subscriber\Cache\CacheSubscriber;
+use Doctrine\Common\Cache\ArrayCache;
+use Guzzle\Http\Client;
+use Guzzle\Cache\DoctrineCacheAdapter;
+use Guzzle\Plugin\Cache\CachePlugin;
 
 class GuzzleFeatureRequester implements FeatureRequester {
     function __construct($baseUri, $apiKey, $options) {
-        $this->_client = new Client(array(
-                                        'base_url' => $baseUri,
-                                        'defaults' => array(
+        $this->_client = new Client($baseUri,
+                                        array(
+                                        'debug' => false,
+                                        'curl.options' => array('CURLOPT_TCP_NODELAY' => 1),
+                                        'request.options' => array(
                                             'headers' => array(
                                                 'Authorization' => "api_key {$apiKey}",
-                                                'Content-Type' => 'application/json',
-                                                'User-Agent' => 'PHPClient/' . LDClient::VERSION
+                                                'Content-Type' => 'application/json'
                                             ),
-                                            'debug' => false,
                                             'timeout' => $options['timeout'],
                                             'connect_timeout' => $options['connect_timeout']
                                         )
                                     ));
+        $this->_client->setUserAgent('PHPClient/' . LDClient::VERSION);
 
-        if (!isset($options['cache_storage'])) {
-            $csOptions = array('validate' => false);
-        }
-        else {
-            $csOptions = array('storage' => $options['cache_storage'], 'validate' => false);
+        if (isset($options['cache_storage'])) {
+            $cachePlugin = new CachePlugin(array('storage' => $options['cache_storage'], 'validate' => false));
+            $this->_client->addSubscriber($cachePlugin);
         }
 
-        CacheSubscriber::attach($this->_client, $csOptions);
     }
 
 
@@ -40,7 +39,8 @@ function __construct($baseUri, $apiKey, $options) {
      */
     public function get($key) {
         try {
-            $response = $this->_client->get("/api/eval/features/$key");
+            $request = $this->_client->get("/api/eval/features/$key");
+            $response = $request->send();
             return $response->json();
         } catch (BadResponseException $e) {
             $code = $e->getResponse()->getStatusCode();