diff --git a/CHANGELOG.md b/CHANGELOG.md
index c33b8615..fa55a900 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/HubSpot/hubspot-api-php/compare/2.2.0...HEAD)
+## [Unreleased](https://github.com/HubSpot/hubspot-api-php/compare/2.3.0...HEAD)
+
+## [2.3.0](https://github.com/HubSpot/hubspot-api-php/releases/tag/2.3.0) - 2020-11-18
+
+### Updated
+ - Update Guzzle version (^6.2 | ^7.0)
 
 ## [2.2.0](https://github.com/HubSpot/hubspot-api-php/releases/tag/2.2.0) - 2020-11-09
 
diff --git a/composer.json b/composer.json
index a49972d7..46c6887d 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "hubspot/api-client",
-    "version": "2.2.0",
+    "version": "2.3.0",
     "description": "Hubspot API client",
     "keywords": [
         "hubspot",
@@ -22,7 +22,7 @@
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
-        "guzzlehttp/guzzle": "^6.2"
+        "guzzlehttp/guzzle": "^6.2 | ^7.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "~2.12",
diff --git a/composer.lock b/composer.lock
index 6bcad620..ac097ad0 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,41 +4,47 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "432be1dd065a0186607ca33b990888a0",
+    "content-hash": "2ff7fa75b27121999416fbaafd5e0898",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/0aa74dfb41ae110835923ef10a9d803a22d50e79",
+                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79",
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             "require": {
                 "ext-json": "*",
-                "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
+                "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.5-dev"
+                    "dev-master": "7.1-dev"
                 }
             },
             "autoload": {
@@ -58,6 +64,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,10 +79,30 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-10-10T11:47:56+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -196,21 +227,22 @@
             "time": "2020-09-30T07:37:11+00:00"
         },
         {
-            "name": "psr/http-message",
+            "name": "psr/http-client",
             "version": "1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-message.git",
-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+                "url": "https://github.com/php-fig/http-client.git",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621"
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             "dist": {
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-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "url": "https://api.github.com/repos/php-fig/http-client/zipball/2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "php": "^7.0 || ^8.0",
+                "psr/http-message": "^1.0"
             },
             "type": "library",
             "extra": {
@@ -220,7 +252,7 @@
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Http\\Message\\": "src/"
+                    "Psr\\Http\\Client\\": "src/"
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@@ -233,256 +265,91 @@
                     "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Common interface for HTTP messages",
-            "homepage": "https://github.com/php-fig/http-message",
+            "description": "Common interface for HTTP clients",
+            "homepage": "https://github.com/php-fig/http-client",
             "keywords": [
                 "http",
-                "http-message",
+                "http-client",
                 "psr",
-                "psr-7",
-                "request",
-                "response"
+                "psr-18"
             ],
-            "time": "2016-08-06T14:39:51+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
-            "name": "ralouphie/getallheaders",
-            "version": "3.0.3",
-            "source": {
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-                "url": "https://github.com/ralouphie/getallheaders.git",
-                "reference": "120b605dfeb996808c31b6477290a714d356e822"
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-                "phpunit/phpunit": "^5 || ^6.5"
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-            "autoload": {
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-            "authors": [
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-                    "email": "ralph.khattar@gmail.com"
-                }
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-            "description": "A polyfill for getallheaders.",
-            "time": "2019-03-08T08:55:37+00:00"
-        },
-        {
-            "name": "symfony/polyfill-intl-idn",
-            "version": "v1.20.0",
+            "name": "psr/http-message",
+            "version": "1.0.1",
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-                "url": "https://github.com/symfony/polyfill-intl-idn.git",
-                "reference": "3b75acd829741c768bc8b1f84eb33265e7cc5117"
+                "url": "https://github.com/php-fig/http-message.git",
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-                "reference": "3b75acd829741c768bc8b1f84eb33265e7cc5117",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
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-                "symfony/polyfill-php72": "^1.10"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
+                "php": ">=5.3.0"
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+                    "dev-master": "1.0.x-dev"
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-                },
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-                    "homepage": "https://symfony.com/contributors"
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-            ],
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-            "homepage": "https://symfony.com",
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-                "intl",
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-                    "url": "https://github.com/symfony/polyfill"
+                    "Psr\\Http\\Message\\": "src/"
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-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Symfony polyfill for intl's Normalizer class and related functions",
-            "homepage": "https://symfony.com",
+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
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-                {
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-                    "type": "tidelift"
-                }
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
+                "response"
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+            "time": "2016-08-06T14:39:51+00:00"
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-            "version": "v1.20.0",
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+            "version": "3.0.3",
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-                "reference": "cede45fcdfabdd6043b3592e83678e42ec69e930"
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+                "reference": "120b605dfeb996808c31b6477290a714d356e822",
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-                "php": ">=7.1"
+                "php": ">=5.6"
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-            "extra": {
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-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
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+            "require-dev": {
+                "php-coveralls/php-coveralls": "^2.1",
+                "phpunit/phpunit": "^5 || ^6.5"
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+            "type": "library",
             "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Php72\\": ""
-                },
                 "files": [
-                    "bootstrap.php"
+                    "src/getallheaders.php"
                 ]
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@@ -491,59 +358,34 @@
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-                    "email": "p@tchwork.com"
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-                    "name": "Symfony Community",
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-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
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+                    "email": "ralph.khattar@gmail.com"
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-            "time": "2020-10-23T14:02:19+00:00"
+            "description": "A polyfill for getallheaders.",
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-                "reference": "4089fddb67bcf6bf860d91b979e95be303835002"
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@@ -599,20 +441,20 @@
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@@ -732,36 +574,31 @@
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-            "version": "1.3.1",
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@@ -798,7 +635,7 @@
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@@ -975,16 +812,16 @@
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@@ -1025,7 +862,7 @@
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@@ -1766,39 +1603,39 @@
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@@ -1855,7 +1692,7 @@
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@@ -3260,6 +3097,87 @@
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@@ -3402,6 +3320,79 @@
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