diff --git a/CHANGELOG.md b/CHANGELOG.md
index b98324cd..e8767b02 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # CHANGELOG
 
+## Next Release
+
+- Routes `UpsAccount`, `UpsMailInnovationsAccount`, and `UpsSurepostAccount` create/update requests to the new `/ups_oauth_registrations` endpoint
+  - Starting `2024-08-05`, UPS accounts will require a new payload to register or update. See [UPS OAuth 2.0 Update](https://support.easypost.com/hc/en-us/articles/26635027512717-UPS-OAuth-2-0-Update?utm_medium=email&_hsenc=p2ANqtz-96MmFtWICOzy9sKRbbcZSiMovZSrY3MSX1_bgY9N3f9yLVfWQdLhjAGq-SmNcOnDIS6GYhZ0OApjDBrGkKyLLMx1z6_TFOVp6-wllhEFQINrkuRuc&_hsmi=313130292&utm_content=313130292&utm_source=hs_email) for more details
+
 ## v7.2.0 (2024-04-10)
 
 - Fix payment method funding and deletion failures due to undetermined payment method type
diff --git a/Makefile b/Makefile
index addc6307..bb5d823e 100644
--- a/Makefile
+++ b/Makefile
@@ -23,8 +23,13 @@ docs:
 	curl -LJs https://github.com/phpDocumentor/phpDocumentor/releases/download/v3.3.1/phpDocumentor.phar -o phpDocumentor.phar
 	php phpDocumentor.phar -d lib -t docs
 
+## init-examples-submodule - Initialize the examples submodule
+init-examples-submodule:
+	git submodule init
+	git submodule update
+
 ## install - Install dependencies
-install: | update-examples-submodule
+install: | init-examples-submodule
 	composer install --no-ansi --no-interaction --no-scripts --no-progress --prefer-dist
 
 ## lint - Lint the project
diff --git a/lib/EasyPost/Constant/Constants.php b/lib/EasyPost/Constant/Constants.php
index b10ca163..e6cafe85 100644
--- a/lib/EasyPost/Constant/Constants.php
+++ b/lib/EasyPost/Constant/Constants.php
@@ -17,10 +17,15 @@ abstract class Constants
     // Validation
     const CARRIER_ACCOUNT_TYPES_WITH_CUSTOM_WORKFLOWS = [
         'FedexAccount',
-        'UpsAccount',
         'FedexSmartpostAccount'
     ];
 
+    const UPS_OAUTH_ACCOUNT_TYPES = [
+        'UpsAccount',
+        'UpsMailInnovationsAccount',
+        'UpsSurepostAccount'
+    ];
+
     // Exception messages (many of these are intended to be used with `sprintf()`)
     const ARRAY_REQUIRED_ERROR = 'You must pass an array as the first argument to EasyPost API method calls.';
     const COMMUNICATION_ERROR = 'Unexpected error communicating with %s. If this problem persists please let us know at ' . self::SUPPORT_EMAIL . '. %s'; // phpcs:ignore
diff --git a/lib/EasyPost/Service/CarrierAccountService.php b/lib/EasyPost/Service/CarrierAccountService.php
index cdbc5840..bb4afa99 100644
--- a/lib/EasyPost/Service/CarrierAccountService.php
+++ b/lib/EasyPost/Service/CarrierAccountService.php
@@ -43,7 +43,16 @@ public function all(mixed $params = null): mixed
      */
     public function update(string $id, mixed $params): mixed
     {
-        return self::updateResource(self::serviceModelClassName(self::class), $id, $params);
+        $carrierAccount = self::retrieve($id);
+        $carrierAccountType = $carrierAccount['type'];
+        if (in_array($carrierAccountType, Constants::UPS_OAUTH_ACCOUNT_TYPES, true)) {
+            $className = 'UpsOauthRegistration';
+            $params = [self::selectTopLayerKey($carrierAccountType) => $params];
+        } else {
+            $className = 'CarrierAccount';
+            $params = [self::selectTopLayerKey($carrierAccountType) => $params];
+        }
+        return self::updateResource($className, $id, $params);
     }
 
     /**
@@ -67,17 +76,13 @@ public function delete(string $id, mixed $params = null): void
      */
     public function create(mixed $params = null): mixed
     {
-        if (!isset($params['carrier_account']) || !is_array($params['carrier_account'])) {
-            $clone = $params;
-            unset($params);
-            $params['carrier_account'] = $clone;
-        }
-
-        if (!isset($params['carrier_account']['type'])) {
+        if (!isset($params['type'])) {
             throw new MissingParameterException(sprintf(Constants::MISSING_PARAMETER_ERROR, 'type'));
         }
 
-        $url = self::selectCarrierAccountCreationEndpoint($params['carrier_account']['type']);
+        $carrierAccountType = $params['type'];
+        $params = [self::selectTopLayerKey($carrierAccountType) => $params];
+        $url = self::selectCarrierAccountCreationEndpoint($carrierAccountType);
         $response = Requestor::request($this->client, 'post', $url, $params);
 
         return InternalUtil::convertToEasyPostObject($this->client, $response);
@@ -106,8 +111,23 @@ private function selectCarrierAccountCreationEndpoint(string $carrierAccountType
     {
         if (in_array($carrierAccountType, Constants::CARRIER_ACCOUNT_TYPES_WITH_CUSTOM_WORKFLOWS, true)) {
             return '/carrier_accounts/register';
+        } else if (in_array($carrierAccountType, Constants::UPS_OAUTH_ACCOUNT_TYPES, true)) {
+            return '/ups_oauth_registrations';
         }
 
         return '/carrier_accounts';
     }
+
+    /**
+     * Select the top-key layer for creating/updating a carrier account based on the type of carrier account.
+     *
+     * @param string $carrierAccountType The type of carrier account to create.
+     * @return string The top-layer key for creating/updating a carrier account.
+     */
+    private function selectTopLayerKey(string $carrierAccountType): string
+    {
+        return in_array($carrierAccountType, Constants::UPS_OAUTH_ACCOUNT_TYPES, true)
+            ? 'ups_oauth_registrations'
+            : 'carrier_account';
+    }
 }
diff --git a/test/EasyPost/CarrierAccountTest.php b/test/EasyPost/CarrierAccountTest.php
index a1d60495..9b460631 100644
--- a/test/EasyPost/CarrierAccountTest.php
+++ b/test/EasyPost/CarrierAccountTest.php
@@ -47,6 +47,28 @@ public function testCreate(): void
         self::$client->carrierAccount->delete($carrierAccount->id);
     }
 
+    /**
+     * Test creating an UPS account.
+     */
+    public function testCreateUps(): void
+    {
+        TestUtil::setupCassette('carrier_accounts/create_ups.yml');
+
+        self::$client = new EasyPostClient(getenv('EASYPOST_PROD_API_KEY'));
+
+        $upsAccount = self::$client->carrierAccount->create([
+            'type' => 'UpsAccount',
+            'account_number' => '123456789'
+        ]);
+
+        $this->assertEquals('UpsAccount', $upsAccount->type);
+        $this->assertInstanceOf(CarrierAccount::class, $upsAccount);
+        $this->assertStringMatchesFormat('ca_%s', $upsAccount->id);
+
+        // Delete the carrier account once it's done being tested.
+        self::$client->carrierAccount->delete($upsAccount->id);
+    }
+
     /**
      * Test creating a carrier account.
      */
@@ -138,6 +160,30 @@ public function testAll(): void
         $this->assertContainsOnlyInstancesOf(CarrierAccount::class, $carrierAccounts);
     }
 
+    /**
+     * Test updating an UPS account.
+     */
+    public function testUpdateUps(): void
+    {
+        TestUtil::setupCassette('carrier_accounts/update_ups.yml');
+
+        self::$client = new EasyPostClient(getenv('EASYPOST_PROD_API_KEY'));
+
+        $upsAccount = self::$client->carrierAccount->create([
+            'type' => 'UpsAccount',
+            'account_number' => '123456789'
+        ]);
+
+        $updatedUpsAccount = self::$client->carrierAccount->update($upsAccount->id, ['account_number' => '987654321']);
+
+        $this->assertInstanceOf(CarrierAccount::class, $updatedUpsAccount);
+        $this->assertStringMatchesFormat('ca_%s', $updatedUpsAccount->id);
+        $this->assertEquals('UpsAccount', $updatedUpsAccount->type);
+
+        // Delete the carrier account once it's done being tested.
+        self::$client->carrierAccount->delete($updatedUpsAccount->id);
+    }
+
     /**
      * Test updating a carrier account.
      */
diff --git a/test/cassettes/carrier_accounts/create_ups.yml b/test/cassettes/carrier_accounts/create_ups.yml
new file mode 100644
index 00000000..9e888aa5
--- /dev/null
+++ b/test/cassettes/carrier_accounts/create_ups.yml
@@ -0,0 +1,157 @@
+
+-
+    request:
+        method: POST
+        url: 'https://api.easypost.com/v2/ups_oauth_registrations'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"ups_oauth_registrations":{"type":"UpsAccount","account_number":"123456789"}}'
+    response:
+        status:
+            code: 201
+            message: Created
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 6754031e668dafcae78bb4ad002eae7b
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1392'
+            x-runtime: '0.096106'
+            x-node: bigweb35nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"id":"ca_7ca26177f5ae42429027f6f40c80fad0","object":"CarrierAccount","type":"UpsAccount","clone":false,"created_at":"2024-07-09T21:46:50Z","updated_at":"2024-07-09T21:46:50Z","description":null,"reference":null,"billing_type":"carrier","readable":"UPS","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/ups_oauth_registrations'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 201
+            header_size: 694
+            request_size: 399
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.569285
+            namelookup_time: 0.025107
+            connect_time: 0.169711
+            pretransfer_time: 0.325097
+            size_upload: 78.0
+            size_download: 1392.0
+            speed_download: 2445.0
+            speed_upload: 137.0
+            download_content_length: 1392.0
+            upload_content_length: 78.0
+            starttransfer_time: 0.569251
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 59855
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 325029
+            connect_time_us: 169711
+            namelookup_time_us: 25107
+            pretransfer_time_us: 325097
+            redirect_time_us: 0
+            starttransfer_time_us: 569251
+            total_time_us: 569285
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: DELETE
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_7ca26177f5ae42429027f6f40c80fad0'
+        headers:
+            Host: api.easypost.com
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 67540321668dafcae78bb4ae002eaee5
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '2'
+            x-runtime: '0.062256'
+            x-node: bigweb35nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '[]'
+        curl_info:
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_7ca26177f5ae42429027f6f40c80fad0'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 686
+            request_size: 332
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.494344
+            namelookup_time: 0.001172
+            connect_time: 0.135907
+            pretransfer_time: 0.288911
+            size_upload: 0.0
+            size_download: 2.0
+            speed_download: 4.0
+            speed_upload: 0.0
+            download_content_length: 2.0
+            upload_content_length: 0.0
+            starttransfer_time: 0.494308
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 59856
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 288815
+            connect_time_us: 135907
+            namelookup_time_us: 1172
+            pretransfer_time_us: 288911
+            redirect_time_us: 0
+            starttransfer_time_us: 494308
+            total_time_us: 494344
+            effective_method: DELETE
+            capath: ''
+            cainfo: ''
+    index: 0
diff --git a/test/cassettes/carrier_accounts/update.yml b/test/cassettes/carrier_accounts/update.yml
index c94d8ccd..13fa9510 100644
--- a/test/cassettes/carrier_accounts/update.yml
+++ b/test/cassettes/carrier_accounts/update.yml
@@ -14,8 +14,7 @@
         body: '{"carrier_account":{"type":"DhlEcsAccount","credentials":{"client_id":"123456","client_secret":"123abc","distribution_center":"USLAX1","pickup_id":"123456"},"test_credentials":{"client_id":"123456","client_secret":"123abc","distribution_center":"USLAX1","pickup_id":"123456"}}}'
     response:
         status:
-            http_version: '1.1'
-            code: '201'
+            code: 201
             message: Created
         headers:
             x-frame-options: SAMEORIGIN
@@ -24,19 +23,19 @@
             x-download-options: noopen
             x-permitted-cross-domain-policies: none
             referrer-policy: strict-origin-when-cross-origin
-            x-ep-request-uuid: 6c53f872655e6541e7885e02001f4518
+            x-ep-request-uuid: 1f7ff67a668db350e798c45d0032c503
             cache-control: 'private, no-cache, no-store'
             pragma: no-cache
             expires: '0'
             content-type: 'application/json; charset=utf-8'
             content-length: '1469'
-            x-runtime: '0.112027'
-            x-node: bigweb31nuq
-            x-version-label: easypost-202311212221-a0f06fbc2c-master
+            x-runtime: '0.086550'
+            x-node: bigweb40nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
             x-backend: easypost
-            x-proxied: ['intlb1nuq b3de2c47ef', 'extlb1nuq 003ad9bca0']
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb2nuq fa152d4755']
             strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
-        body: '{"id":"ca_b9bdc1b4620d47188f410cc2f386b31c","object":"CarrierAccount","type":"DhlEcsAccount","clone":false,"created_at":"2023-11-22T20:32:02Z","updated_at":"2023-11-22T20:32:02Z","description":"DHL eCommerce Solutions Account","reference":null,"billing_type":"carrier","readable":"DHL eCommerce Solutions","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        body: '{"id":"ca_2ffe0d6ea57d44069f96e8343e01d134","object":"CarrierAccount","type":"DhlEcsAccount","clone":false,"created_at":"2024-07-09T22:01:52Z","updated_at":"2024-07-09T22:01:52Z","description":"DHL eCommerce Solutions Account","reference":null,"billing_type":"carrier","readable":"DHL eCommerce Solutions","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
         curl_info:
             url: 'https://api.easypost.com/v2/carrier_accounts'
             content_type: 'application/json; charset=utf-8'
@@ -46,40 +45,120 @@
             filetime: -1
             ssl_verify_result: 0
             redirect_count: 0
-            total_time: 0.310246
-            namelookup_time: 0.001315
-            connect_time: 0.067338
-            pretransfer_time: 0.134517
+            total_time: 0.530043
+            namelookup_time: 0.003049
+            connect_time: 0.146971
+            pretransfer_time: 0.299929
             size_upload: 277.0
             size_download: 1469.0
-            speed_download: 4734.0
-            speed_upload: 892.0
+            speed_download: 2771.0
+            speed_upload: 522.0
             download_content_length: 1469.0
             upload_content_length: 277.0
-            starttransfer_time: 0.310192
+            starttransfer_time: 0.530017
             redirect_time: 0.0
             redirect_url: ''
-            primary_ip: 169.62.110.131
+            primary_ip: 169.62.110.130
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 60262
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 299749
+            connect_time_us: 146971
+            namelookup_time_us: 3049
+            pretransfer_time_us: 299929
+            redirect_time_us: 0
+            starttransfer_time_us: 530017
+            total_time_us: 530043
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: GET
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
+        headers:
+            Host: api.easypost.com
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 1f7ff677668db350e798c45e0032c59c
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1469'
+            x-runtime: '0.035548'
+            x-node: bigweb42nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb2nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"id":"ca_2ffe0d6ea57d44069f96e8343e01d134","object":"CarrierAccount","type":"DhlEcsAccount","clone":false,"created_at":"2024-07-09T22:01:52Z","updated_at":"2024-07-09T22:01:52Z","description":"DHL eCommerce Solutions Account","reference":null,"billing_type":"carrier","readable":"DHL eCommerce Solutions","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 689
+            request_size: 329
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.462106
+            namelookup_time: 0.000968
+            connect_time: 0.136148
+            pretransfer_time: 0.280391
+            size_upload: 0.0
+            size_download: 1469.0
+            speed_download: 3178.0
+            speed_upload: 0.0
+            download_content_length: 1469.0
+            upload_content_length: 0.0
+            starttransfer_time: 0.462072
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.130
             certinfo: {  }
             primary_port: 443
-            local_ip: 10.130.6.39
-            local_port: 53580
+            local_ip: 10.130.6.20
+            local_port: 60263
             http_version: 2
             protocol: 2
             ssl_verifyresult: 0
             scheme: HTTPS
-            appconnect_time_us: 134445
-            connect_time_us: 67338
-            namelookup_time_us: 1315
-            pretransfer_time_us: 134517
+            appconnect_time_us: 280299
+            connect_time_us: 136148
+            namelookup_time_us: 968
+            pretransfer_time_us: 280391
             redirect_time_us: 0
-            starttransfer_time_us: 310192
-            total_time_us: 310246
+            starttransfer_time_us: 462072
+            total_time_us: 462106
+            effective_method: GET
+            capath: ''
+            cainfo: ''
     index: 0
 -
     request:
         method: PATCH
-        url: 'https://api.easypost.com/v2/carrier_accounts/ca_b9bdc1b4620d47188f410cc2f386b31c'
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
         headers:
             Host: api.easypost.com
             Expect: ''
@@ -88,11 +167,10 @@
             Authorization: ''
             Content-Type: application/json
             User-Agent: ''
-        body: '{"description":"My custom description"}'
+        body: '{"carrier_account":{"description":"My custom description"}}'
     response:
         status:
-            http_version: '1.1'
-            code: '200'
+            code: 200
             message: OK
         headers:
             x-frame-options: SAMEORIGIN
@@ -101,62 +179,66 @@
             x-download-options: noopen
             x-permitted-cross-domain-policies: none
             referrer-policy: strict-origin-when-cross-origin
-            x-ep-request-uuid: 6c53f876655e6542e7885e03001f4552
+            x-ep-request-uuid: 67540322668db351e798c45f00319cc8
             cache-control: 'private, no-cache, no-store'
             pragma: no-cache
             expires: '0'
             content-type: 'application/json; charset=utf-8'
             content-length: '1459'
-            x-runtime: '0.143297'
-            x-node: bigweb34nuq
-            x-version-label: easypost-202311212221-a0f06fbc2c-master
+            x-runtime: '0.213593'
+            x-node: bigweb32nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
             x-backend: easypost
-            x-proxied: ['intlb1nuq b3de2c47ef', 'extlb1nuq 003ad9bca0']
+            x-canary: direct
+            x-proxied: ['intlb4nuq fa152d4755', 'extlb1nuq fa152d4755']
             strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
-        body: '{"id":"ca_b9bdc1b4620d47188f410cc2f386b31c","object":"CarrierAccount","type":"DhlEcsAccount","clone":false,"created_at":"2023-11-22T20:32:02Z","updated_at":"2023-11-22T20:32:02Z","description":"My custom description","reference":null,"billing_type":"carrier","readable":"DHL eCommerce Solutions","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        body: '{"id":"ca_2ffe0d6ea57d44069f96e8343e01d134","object":"CarrierAccount","type":"DhlEcsAccount","clone":false,"created_at":"2024-07-09T22:01:52Z","updated_at":"2024-07-09T22:01:53Z","description":"My custom description","reference":null,"billing_type":"carrier","readable":"DHL eCommerce Solutions","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
         curl_info:
-            url: 'https://api.easypost.com/v2/carrier_accounts/ca_b9bdc1b4620d47188f410cc2f386b31c'
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
             content_type: 'application/json; charset=utf-8'
             http_code: 200
-            header_size: 689
-            request_size: 390
+            header_size: 707
+            request_size: 410
             filetime: -1
             ssl_verify_result: 0
             redirect_count: 0
-            total_time: 0.33584
-            namelookup_time: 0.001073
-            connect_time: 0.062722
-            pretransfer_time: 0.128365
-            size_upload: 39.0
+            total_time: 0.641964
+            namelookup_time: 0.00116
+            connect_time: 0.142065
+            pretransfer_time: 0.279365
+            size_upload: 59.0
             size_download: 1459.0
-            speed_download: 4344.0
-            speed_upload: 116.0
+            speed_download: 2272.0
+            speed_upload: 91.0
             download_content_length: 1459.0
-            upload_content_length: 39.0
-            starttransfer_time: 0.335805
+            upload_content_length: 59.0
+            starttransfer_time: 0.641941
             redirect_time: 0.0
             redirect_url: ''
             primary_ip: 169.62.110.131
             certinfo: {  }
             primary_port: 443
-            local_ip: 10.130.6.39
-            local_port: 53581
+            local_ip: 10.130.6.20
+            local_port: 60264
             http_version: 2
             protocol: 2
             ssl_verifyresult: 0
             scheme: HTTPS
-            appconnect_time_us: 128305
-            connect_time_us: 62722
-            namelookup_time_us: 1073
-            pretransfer_time_us: 128365
+            appconnect_time_us: 279316
+            connect_time_us: 142065
+            namelookup_time_us: 1160
+            pretransfer_time_us: 279365
             redirect_time_us: 0
-            starttransfer_time_us: 335805
-            total_time_us: 335840
+            starttransfer_time_us: 641941
+            total_time_us: 641964
+            effective_method: PATCH
+            capath: ''
+            cainfo: ''
     index: 0
 -
     request:
         method: DELETE
-        url: 'https://api.easypost.com/v2/carrier_accounts/ca_b9bdc1b4620d47188f410cc2f386b31c'
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
         headers:
             Host: api.easypost.com
             Accept-Encoding: ''
@@ -166,8 +248,7 @@
             User-Agent: ''
     response:
         status:
-            http_version: '1.1'
-            code: '200'
+            code: 200
             message: OK
         headers:
             x-frame-options: SAMEORIGIN
@@ -176,21 +257,21 @@
             x-download-options: noopen
             x-permitted-cross-domain-policies: none
             referrer-policy: strict-origin-when-cross-origin
-            x-ep-request-uuid: 6c53f872655e6542e7885e04001f45a7
+            x-ep-request-uuid: 6754031f668db352e798c46300319daf
             cache-control: 'private, no-cache, no-store'
             pragma: no-cache
             expires: '0'
             content-type: 'application/json; charset=utf-8'
             content-length: '2'
-            x-runtime: '0.108569'
-            x-node: bigweb38nuq
-            x-version-label: easypost-202311212221-a0f06fbc2c-master
+            x-runtime: '0.062378'
+            x-node: bigweb53nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
             x-backend: easypost
-            x-proxied: ['intlb2nuq b3de2c47ef', 'extlb1nuq 003ad9bca0']
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
             strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
         body: '[]'
         curl_info:
-            url: 'https://api.easypost.com/v2/carrier_accounts/ca_b9bdc1b4620d47188f410cc2f386b31c'
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_2ffe0d6ea57d44069f96e8343e01d134'
             content_type: 'application/json; charset=utf-8'
             http_code: 200
             header_size: 686
@@ -198,33 +279,36 @@
             filetime: -1
             ssl_verify_result: 0
             redirect_count: 0
-            total_time: 0.304357
-            namelookup_time: 0.001048
-            connect_time: 0.065379
-            pretransfer_time: 0.131954
+            total_time: 0.49259
+            namelookup_time: 0.000986
+            connect_time: 0.142402
+            pretransfer_time: 0.2853
             size_upload: 0.0
             size_download: 2.0
-            speed_download: 6.0
+            speed_download: 4.0
             speed_upload: 0.0
             download_content_length: 2.0
             upload_content_length: 0.0
-            starttransfer_time: 0.304325
+            starttransfer_time: 0.492559
             redirect_time: 0.0
             redirect_url: ''
             primary_ip: 169.62.110.131
             certinfo: {  }
             primary_port: 443
-            local_ip: 10.130.6.39
-            local_port: 53582
+            local_ip: 10.130.6.20
+            local_port: 60268
             http_version: 2
             protocol: 2
             ssl_verifyresult: 0
             scheme: HTTPS
-            appconnect_time_us: 131881
-            connect_time_us: 65379
-            namelookup_time_us: 1048
-            pretransfer_time_us: 131954
+            appconnect_time_us: 285209
+            connect_time_us: 142402
+            namelookup_time_us: 986
+            pretransfer_time_us: 285300
             redirect_time_us: 0
-            starttransfer_time_us: 304325
-            total_time_us: 304357
+            starttransfer_time_us: 492559
+            total_time_us: 492590
+            effective_method: DELETE
+            capath: ''
+            cainfo: ''
     index: 0
diff --git a/test/cassettes/carrier_accounts/update_ups.yml b/test/cassettes/carrier_accounts/update_ups.yml
new file mode 100644
index 00000000..af3ee00c
--- /dev/null
+++ b/test/cassettes/carrier_accounts/update_ups.yml
@@ -0,0 +1,314 @@
+
+-
+    request:
+        method: POST
+        url: 'https://api.easypost.com/v2/ups_oauth_registrations'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"ups_oauth_registrations":{"type":"UpsAccount","account_number":"123456789"}}'
+    response:
+        status:
+            code: 201
+            message: Created
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 67540321668db352e798c46400319e54
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1404'
+            x-runtime: '0.099291'
+            x-node: bigweb38nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"id":"ca_abab1d73e47943938a56326d10d0776b","object":"CarrierAccount","type":"UpsAccount","clone":false,"created_at":"2024-07-09T22:01:54Z","updated_at":"2024-07-09T22:01:54Z","description":null,"reference":null,"billing_type":"carrier","readable":"UPS","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/ups_oauth_registrations'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 201
+            header_size: 694
+            request_size: 399
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.538196
+            namelookup_time: 0.001377
+            connect_time: 0.138061
+            pretransfer_time: 0.291193
+            size_upload: 78.0
+            size_download: 1404.0
+            speed_download: 2608.0
+            speed_upload: 144.0
+            download_content_length: 1404.0
+            upload_content_length: 78.0
+            starttransfer_time: 0.538149
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 60269
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 291133
+            connect_time_us: 138061
+            namelookup_time_us: 1377
+            pretransfer_time_us: 291193
+            redirect_time_us: 0
+            starttransfer_time_us: 538149
+            total_time_us: 538196
+            effective_method: POST
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: GET
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_abab1d73e47943938a56326d10d0776b'
+        headers:
+            Host: api.easypost.com
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 67540320668db353e798c47c00319f28
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1404'
+            x-runtime: '0.037830'
+            x-node: bigweb42nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"id":"ca_abab1d73e47943938a56326d10d0776b","object":"CarrierAccount","type":"UpsAccount","clone":false,"created_at":"2024-07-09T22:01:54Z","updated_at":"2024-07-09T22:01:54Z","description":null,"reference":null,"billing_type":"carrier","readable":"UPS","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_abab1d73e47943938a56326d10d0776b'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 689
+            request_size: 329
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.480215
+            namelookup_time: 0.001224
+            connect_time: 0.144826
+            pretransfer_time: 0.297933
+            size_upload: 0.0
+            size_download: 1404.0
+            speed_download: 2923.0
+            speed_upload: 0.0
+            download_content_length: 1404.0
+            upload_content_length: 0.0
+            starttransfer_time: 0.480186
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 60270
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 297877
+            connect_time_us: 144826
+            namelookup_time_us: 1224
+            pretransfer_time_us: 297933
+            redirect_time_us: 0
+            starttransfer_time_us: 480186
+            total_time_us: 480215
+            effective_method: GET
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: PATCH
+        url: 'https://api.easypost.com/v2/ups_oauth_registrations/ca_abab1d73e47943938a56326d10d0776b'
+        headers:
+            Host: api.easypost.com
+            Expect: ''
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+        body: '{"ups_oauth_registrations":{"account_number":"987654321"}}'
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 6754031e668db353e798c47e00319fb8
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '1400'
+            x-runtime: '0.072803'
+            x-node: bigweb40nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '{"id":"ca_abab1d73e47943938a56326d10d0776b","object":"CarrierAccount","type":"UpsAccount","clone":false,"created_at":"2024-07-09T22:01:54Z","updated_at":"2024-07-09T22:01:55Z","description":null,"reference":null,"billing_type":"carrier","readable":"UPS","logo":null,"fields":[],"credentials":[],"test_credentials":[]}'
+        curl_info:
+            url: 'https://api.easypost.com/v2/ups_oauth_registrations/ca_abab1d73e47943938a56326d10d0776b'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 689
+            request_size: 416
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.496408
+            namelookup_time: 0.00119
+            connect_time: 0.144791
+            pretransfer_time: 0.282148
+            size_upload: 58.0
+            size_download: 1400.0
+            speed_download: 2820.0
+            speed_upload: 116.0
+            download_content_length: 1400.0
+            upload_content_length: 58.0
+            starttransfer_time: 0.496363
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 60272
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 282090
+            connect_time_us: 144791
+            namelookup_time_us: 1190
+            pretransfer_time_us: 282148
+            redirect_time_us: 0
+            starttransfer_time_us: 496363
+            total_time_us: 496408
+            effective_method: PATCH
+            capath: ''
+            cainfo: ''
+    index: 0
+-
+    request:
+        method: DELETE
+        url: 'https://api.easypost.com/v2/carrier_accounts/ca_abab1d73e47943938a56326d10d0776b'
+        headers:
+            Host: api.easypost.com
+            Accept-Encoding: ''
+            Accept: application/json
+            Authorization: ''
+            Content-Type: application/json
+            User-Agent: ''
+    response:
+        status:
+            code: 200
+            message: OK
+        headers:
+            x-frame-options: SAMEORIGIN
+            x-xss-protection: '1; mode=block'
+            x-content-type-options: nosniff
+            x-download-options: noopen
+            x-permitted-cross-domain-policies: none
+            referrer-policy: strict-origin-when-cross-origin
+            x-ep-request-uuid: 6754031c668db354e798c47f0031a055
+            cache-control: 'private, no-cache, no-store'
+            pragma: no-cache
+            expires: '0'
+            content-type: 'application/json; charset=utf-8'
+            content-length: '2'
+            x-runtime: '0.064436'
+            x-node: bigweb43nuq
+            x-version-label: easypost-202407092027-324ee50b5a-master
+            x-backend: easypost
+            x-canary: direct
+            x-proxied: ['intlb3nuq fa152d4755', 'extlb1nuq fa152d4755']
+            strict-transport-security: 'max-age=31536000; includeSubDomains; preload'
+        body: '[]'
+        curl_info:
+            url: 'https://api.easypost.com/v2/carrier_accounts/ca_abab1d73e47943938a56326d10d0776b'
+            content_type: 'application/json; charset=utf-8'
+            http_code: 200
+            header_size: 704
+            request_size: 332
+            filetime: -1
+            ssl_verify_result: 0
+            redirect_count: 0
+            total_time: 0.487325
+            namelookup_time: 0.001181
+            connect_time: 0.130724
+            pretransfer_time: 0.276682
+            size_upload: 0.0
+            size_download: 2.0
+            speed_download: 4.0
+            speed_upload: 0.0
+            download_content_length: 2.0
+            upload_content_length: 0.0
+            starttransfer_time: 0.487301
+            redirect_time: 0.0
+            redirect_url: ''
+            primary_ip: 169.62.110.131
+            certinfo: {  }
+            primary_port: 443
+            local_ip: 10.130.6.20
+            local_port: 60273
+            http_version: 2
+            protocol: 2
+            ssl_verifyresult: 0
+            scheme: HTTPS
+            appconnect_time_us: 276624
+            connect_time_us: 130724
+            namelookup_time_us: 1181
+            pretransfer_time_us: 276682
+            redirect_time_us: 0
+            starttransfer_time_us: 487301
+            total_time_us: 487325
+            effective_method: DELETE
+            capath: ''
+            cainfo: ''
+    index: 0