diff --git a/composer.json b/composer.json
index a2a76015..d31ab741 100755
--- a/composer.json
+++ b/composer.json
@@ -5,8 +5,8 @@
   "homepage": "https://github.com/zendesk/zendesk_api_client_php",
   "require": {
     "php": ">=8.2.0",
-    "guzzlehttp/guzzle": "^6.0 || ^7.0",
-    "guzzlehttp/psr7": "^1.7 || ^2.0",
+    "guzzlehttp/guzzle": "^7.8.2 || ^8.0",
+    "guzzlehttp/psr7": "^2.6.3 || ^3.0",
     "mmucklo/inflect": "0.3.*"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index ccb6e7b8..df39b41c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,29 +4,30 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "98b537b2c22e2f67b8facecd331c30e4",
+    "content-hash": "3350359cad4d86d88b2ec132d46c59f1",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "7.9.2",
+            "version": "7.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "d281ed313b989f213357e3be1a179f02196ac99b"
+                "reference": "aef242412e13128b5049864867bb49fc37dd39de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/d281ed313b989f213357e3be1a179f02196ac99b",
-                "reference": "d281ed313b989f213357e3be1a179f02196ac99b",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/aef242412e13128b5049864867bb49fc37dd39de",
+                "reference": "aef242412e13128b5049864867bb49fc37dd39de",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
-                "guzzlehttp/promises": "^1.5.3 || ^2.0.3",
-                "guzzlehttp/psr7": "^2.7.0",
+                "guzzlehttp/promises": "^2.5.1",
+                "guzzlehttp/psr7": "^2.12.4",
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-client": "^1.0",
-                "symfony/deprecation-contracts": "^2.2 || ^3.0"
+                "symfony/deprecation-contracts": "^2.5 || ^3.0",
+                "symfony/polyfill-php80": "^1.25"
             },
             "provide": {
                 "psr/http-client-implementation": "1.0"
@@ -34,9 +35,10 @@
             "require-dev": {
                 "bamarni/composer-bin-plugin": "^1.8.2",
                 "ext-curl": "*",
-                "guzzle/client-integration-tests": "3.0.2",
+                "guzzle/client-integration-tests": "3.0.3",
+                "guzzlehttp/test-server": "^0.6",
                 "php-http/message-factory": "^1.1",
-                "phpunit/phpunit": "^8.5.39 || ^9.6.20",
+                "phpunit/phpunit": "^8.5.52 || ^9.6.34",
                 "psr/log": "^1.1 || ^2.0 || ^3.0"
             },
             "suggest": {
@@ -114,7 +116,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/7.9.2"
+                "source": "https://github.com/guzzle/guzzle/tree/7.14.0"
             },
             "funding": [
                 {
@@ -130,28 +132,29 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-24T11:22:20+00:00"
+            "time": "2026-07-08T22:54:09+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "2.0.4",
+            "version": "2.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "f9c436286ab2892c7db7be8c8da4ef61ccf7b455"
+                "reference": "9ad1e4fc607446a055b95870c7f668e93b5cff29"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/f9c436286ab2892c7db7be8c8da4ef61ccf7b455",
-                "reference": "f9c436286ab2892c7db7be8c8da4ef61ccf7b455",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/9ad1e4fc607446a055b95870c7f668e93b5cff29",
+                "reference": "9ad1e4fc607446a055b95870c7f668e93b5cff29",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2.5 || ^8.0"
+                "php": "^7.2.5 || ^8.0",
+                "symfony/deprecation-contracts": "^2.5 || ^3.0"
             },
             "require-dev": {
                 "bamarni/composer-bin-plugin": "^1.8.2",
-                "phpunit/phpunit": "^8.5.39 || ^9.6.20"
+                "phpunit/phpunit": "^8.5.52 || ^9.6.34"
             },
             "type": "library",
             "extra": {
@@ -197,7 +200,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/promises/issues",
-                "source": "https://github.com/guzzle/promises/tree/2.0.4"
+                "source": "https://github.com/guzzle/promises/tree/2.5.1"
             },
             "funding": [
                 {
@@ -213,27 +216,29 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-10-17T10:06:22+00:00"
+            "time": "2026-07-08T15:48:39+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "2.7.0",
+            "version": "2.12.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "a70f5c95fb43bc83f07c9c948baa0dc1829bf201"
+                "reference": "51e27f9e2b332ab3e72f4520d5ff4f3c68c3577c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/a70f5c95fb43bc83f07c9c948baa0dc1829bf201",
-                "reference": "a70f5c95fb43bc83f07c9c948baa0dc1829bf201",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/51e27f9e2b332ab3e72f4520d5ff4f3c68c3577c",
+                "reference": "51e27f9e2b332ab3e72f4520d5ff4f3c68c3577c",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-factory": "^1.0",
                 "psr/http-message": "^1.1 || ^2.0",
-                "ralouphie/getallheaders": "^3.0"
+                "ralouphie/getallheaders": "^3.0",
+                "symfony/deprecation-contracts": "^2.5 || ^3.0",
+                "symfony/polyfill-php80": "^1.25"
             },
             "provide": {
                 "psr/http-factory-implementation": "1.0",
@@ -241,8 +246,9 @@
             },
             "require-dev": {
                 "bamarni/composer-bin-plugin": "^1.8.2",
-                "http-interop/http-factory-tests": "0.9.0",
-                "phpunit/phpunit": "^8.5.39 || ^9.6.20"
+                "http-interop/http-factory-tests": "1.1.0",
+                "jshttp/mime-db": "1.54.0.1",
+                "phpunit/phpunit": "^8.5.52 || ^9.6.34"
             },
             "suggest": {
                 "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
@@ -313,7 +319,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/psr7/issues",
-                "source": "https://github.com/guzzle/psr7/tree/2.7.0"
+                "source": "https://github.com/guzzle/psr7/tree/2.12.4"
             },
             "funding": [
                 {
@@ -329,7 +335,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-07-18T11:15:46+00:00"
+            "time": "2026-07-08T15:56:20+00:00"
         },
         {
             "name": "mmucklo/inflect",
@@ -591,16 +597,16 @@
         },
         {
             "name": "symfony/deprecation-contracts",
-            "version": "v3.5.1",
+            "version": "v3.7.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/deprecation-contracts.git",
-                "reference": "74c71c939a79f7d5bf3c1ce9f5ea37ba0114c6f6"
+                "reference": "f3202fa1b5097b0af062dc978b32ecf63404e31d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/74c71c939a79f7d5bf3c1ce9f5ea37ba0114c6f6",
-                "reference": "74c71c939a79f7d5bf3c1ce9f5ea37ba0114c6f6",
+                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/f3202fa1b5097b0af062dc978b32ecf63404e31d",
+                "reference": "f3202fa1b5097b0af062dc978b32ecf63404e31d",
                 "shasum": ""
             },
             "require": {
@@ -608,12 +614,12 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "3.5-dev"
-                },
                 "thanks": {
-                    "name": "symfony/contracts",
-                    "url": "https://github.com/symfony/contracts"
+                    "url": "https://github.com/symfony/contracts",
+                    "name": "symfony/contracts"
+                },
+                "branch-alias": {
+                    "dev-main": "3.7-dev"
                 }
             },
             "autoload": {
@@ -638,7 +644,7 @@
             "description": "A generic function and convention to trigger deprecation notices",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.5.1"
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.7.1"
             },
             "funding": [
                 {
@@ -649,12 +655,100 @@
                     "url": "https://github.com/fabpot",
                     "type": "github"
                 },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
                 {
                     "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-09-25T14:20:29+00:00"
+            "time": "2026-06-05T06:23:12+00:00"
+        },
+        {
+            "name": "symfony/polyfill-php80",
+            "version": "v1.37.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-php80.git",
+                "reference": "dfb55726c3a76ea3b6459fcfda1ec2d80a682411"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/dfb55726c3a76ea3b6459fcfda1ec2d80a682411",
+                "reference": "dfb55726c3a76ea3b6459fcfda1ec2d80a682411",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php80\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ion Bazan",
+                    "email": "ion.bazan@gmail.com"
+                },
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.37.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2026-04-10T16:19:22+00:00"
         }
     ],
     "packages-dev": [
@@ -3933,5 +4027,5 @@
         "php": ">=8.2.0"
     },
     "platform-dev": {},
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/src/Zendesk/API/Exceptions/ApiResponseException.php b/src/Zendesk/API/Exceptions/ApiResponseException.php
index 2eb0d3c8..4d45139d 100644
--- a/src/Zendesk/API/Exceptions/ApiResponseException.php
+++ b/src/Zendesk/API/Exceptions/ApiResponseException.php
@@ -4,6 +4,7 @@
 
 use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ResponseException;
 use GuzzleHttp\Exception\ServerException;
 
 /**
@@ -22,6 +23,9 @@ public function __construct(RequestException $e)
     {
         $message = $e->getMessage();
 
+        $hasResponse = $e instanceof ResponseException
+            || (is_callable([$e, 'hasResponse']) && $e->hasResponse());
+
         if ($e instanceof ClientException) {
             $response           = $e->getResponse();
             $responseBody       = $response->getBody()->getContents();
@@ -29,7 +33,7 @@ public function __construct(RequestException $e)
             $message .= ' [details] ' . $this->errorDetails;
         } elseif ($e instanceof ServerException) {
             $message .= ' [details] Zendesk may be experiencing internal issues or undergoing scheduled maintenance.';
-        } elseif (! $e->hasResponse()) {
+        } elseif (! $hasResponse) {
             $request = $e->getRequest();
             // Unsuccessful response, log what we can
             $message .= ' [url] ' . $request->getUri();
diff --git a/src/Zendesk/API/Http.php b/src/Zendesk/API/Http.php
index 14fba49f..986b3d63 100644
--- a/src/Zendesk/API/Http.php
+++ b/src/Zendesk/API/Http.php
@@ -3,9 +3,11 @@
 namespace Zendesk\API;
 
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ResponseException;
 use GuzzleHttp\Psr7\LazyOpenStream;
 use GuzzleHttp\Psr7\Request;
 use GuzzleHttp\Psr7\Utils;
+use Psr\Http\Client\NetworkExceptionInterface;
 use Psr\Http\Message\StreamInterface;
 use Zendesk\API\Exceptions\ApiResponseException;
 use Zendesk\API\Exceptions\AuthException;
@@ -95,8 +97,13 @@ public static function send(
             }
             $response = $client->guzzle->send($request, $requestOptions);
         } catch (RequestException $e) {
-            $requestException = RequestException::create($e->getRequest(), $e->getResponse(), $e);
+            $errorResponse = $e instanceof ResponseException
+                ? $e->getResponse()
+                : (is_callable([$e, 'getResponse']) ? $e->getResponse() : null);
+            $requestException = RequestException::create($e->getRequest(), $errorResponse, $e);
             throw new ApiResponseException($requestException);
+        } catch (NetworkExceptionInterface $e) {
+            throw new ApiResponseException(RequestException::create($e->getRequest(), null, $e));
         } finally {
             $client->setDebug(
                 $request->getHeaders(),
diff --git a/src/Zendesk/API/Traits/Resource/MultipartUpload.php b/src/Zendesk/API/Traits/Resource/MultipartUpload.php
index 3dda0380..5f946915 100644
--- a/src/Zendesk/API/Traits/Resource/MultipartUpload.php
+++ b/src/Zendesk/API/Traits/Resource/MultipartUpload.php
@@ -68,18 +68,21 @@ public function upload(array $params, $routeKey = __FUNCTION__)
             $stream = new LazyOpenStream($params['file'], 'r');
         }
 
+        $part = [
+            'name'     => $this->getUploadName(),
+            'contents' => $stream
+        ];
+
+        if (is_string($filename)) {
+            $part['filename'] = $filename;
+        }
+
         $response = Http::send(
             $this->client,
             $route,
             [
                 'method'    => $this->getUploadRequestMethod(),
-                'multipart' => [
-                    [
-                        'name'     => $this->getUploadName(),
-                        'contents' => $stream,
-                        'filename' => $filename
-                    ]
-                ]
+                'multipart' => [$part]
             ]
         );
 
diff --git a/src/Zendesk/Fixtures/MockResource.php b/src/Zendesk/Fixtures/MockResource.php
index 51dbcc87..303eac6a 100644
--- a/src/Zendesk/Fixtures/MockResource.php
+++ b/src/Zendesk/Fixtures/MockResource.php
@@ -3,6 +3,7 @@
 namespace Zendesk\Fixtures;
 
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ResponseException;
 use GuzzleHttp\Psr7\Request;
 use GuzzleHttp\Psr7\Response;
 use Zendesk\API\Exceptions\ApiResponseException;
@@ -30,7 +31,11 @@ public function findAll($params)
         if ($this->errorMessage) {
             $request = new Request('GET', 'http://example.zendesk.com');
             $this->response = new Response(400, [], '{ "a": "json"}');
-            $requestException = new RequestException($this->errorMessage, $request, $this->response);
+            if (class_exists(ResponseException::class)) {
+                $requestException = new ResponseException($this->errorMessage, $request, $this->response);
+            } else {
+                $requestException = new RequestException($this->errorMessage, $request, $this->response);
+            }
             throw new ApiResponseException($requestException);
         } elseif ($this->isObp) {
             $this->response = (object) [
diff --git a/tests/Zendesk/API/UnitTests/Core/ResourceTest.php b/tests/Zendesk/API/UnitTests/Core/ResourceTest.php
index c5a1ffb2..266416cb 100644
--- a/tests/Zendesk/API/UnitTests/Core/ResourceTest.php
+++ b/tests/Zendesk/API/UnitTests/Core/ResourceTest.php
@@ -3,9 +3,11 @@
 namespace Zendesk\API\UnitTests\Core;
 
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Psr7\AppendStream;
 use GuzzleHttp\Psr7\Request;
 use GuzzleHttp\Psr7\Response;
 use GuzzleHttp\Psr7\LazyOpenStream;
+use GuzzleHttp\Psr7\Utils;
 use Zendesk\API\UnitTests\BasicTest;
 
 /**
@@ -378,4 +380,28 @@ public function testUploadStreamMultiPart()
             ]
         );
     }
+
+    /**
+     * Test multipart upload with streams that have no file uri
+     */
+    public function testUploadStreamWithoutUriMultiPart()
+    {
+        $this->mockAPIResponses([
+            new Response(200, [], '')
+        ]);
+
+        $params = [
+            'file' => new AppendStream([Utils::streamFor('test file contents')])
+        ];
+
+        $this->dummyResource->upload($params);
+
+        $this->assertLastRequestIs(
+            [
+                'method' => 'POST',
+                'endpoint' => 'dummy_resource/uploads.json',
+                'multipart' => true,
+            ]
+        );
+    }
 }
diff --git a/tests/Zendesk/API/UnitTests/HttpTest.php b/tests/Zendesk/API/UnitTests/HttpTest.php
index 0b5ba4b6..e13b9eb8 100644
--- a/tests/Zendesk/API/UnitTests/HttpTest.php
+++ b/tests/Zendesk/API/UnitTests/HttpTest.php
@@ -5,10 +5,13 @@
 use Exception;
 use Faker\Factory;
 use GuzzleHttp\Client as GuzzleClient;
+use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ResponseException;
 use GuzzleHttp\Psr7\Request;
 use GuzzleHttp\Psr7\Response;
 use GuzzleHttp\Psr7\Stream;
+use Zendesk\API\Exceptions\ApiResponseException;
 use Zendesk\API\Http;
 use Zendesk\API\HttpClient;
 
@@ -56,6 +59,20 @@ public function testOriginalRequestExceptionIsPreserved()
         }
     }
 
+    public function testConnectExceptionIsWrappedInApiResponseException()
+    {
+        $request          = new Request('GET', 'http://example.com');
+        $connectException = new ConnectException('Connection refused', $request);
+        $this->mockApiResponses([$connectException]);
+
+        try {
+            Http::send($this->client, '/tickets.json');
+            $this->fail('Expected ApiResponseException was not thrown.');
+        } catch (ApiResponseException $e) {
+            $this->assertSame($connectException, $e->getPrevious()->getPrevious());
+        }
+    }
+
     /**
      * Create a mocked RequestExcpetion
      *
@@ -79,6 +96,10 @@ private function mockRequestException($message)
         $response->method('getBody')
             ->will($this->returnValue($body));
 
+        if (class_exists(ResponseException::class)) {
+            return new ResponseException($message, $request, $response);
+        }
+
         return new RequestException($message, $request, $response);
     }
 }
diff --git a/tests/Zendesk/API/UnitTests/Sell/ContactsTest.php b/tests/Zendesk/API/UnitTests/Sell/ContactsTest.php
index 4d140571..1a911d2d 100644
--- a/tests/Zendesk/API/UnitTests/Sell/ContactsTest.php
+++ b/tests/Zendesk/API/UnitTests/Sell/ContactsTest.php
@@ -41,9 +41,9 @@ public function testUpsert()
 
         $encodedQueryParams = [];
         foreach ($queryParams as $key => $value) {
-            // Encode the 'phone' query param's whitespace
+            // Encode the 'phone' query param's whitespace and plus signs
             if ($key === 'phone') {
-                $value = str_replace(' ', '%20', $value);
+                $value = str_replace([' ', '+'], ['%20', '%2B'], $value);
             }
             $encodedQueryParams[$key] = $value;
         }