diff --git a/.changelog-pending/2026-07-28T19-17-36-72f2c0b2792fb452e4b7e1a0555c2fe14b857631.md b/.changelog-pending/2026-07-28T19-17-36-72f2c0b2792fb452e4b7e1a0555c2fe14b857631.md
deleted file mode 100644
index 780bc86f..00000000
--- a/.changelog-pending/2026-07-28T19-17-36-72f2c0b2792fb452e4b7e1a0555c2fe14b857631.md
+++ /dev/null
@@ -1,18 +0,0 @@
-* [#425](https://github.com/workos/workos-php/pull/425) fix(generated): regenerate from spec
-
-  **Features**
-  * **[pipes](https://workos.com/docs/reference/pipes)**:
-    * Added `config` to `DataIntegrationsGetDataIntegrationAuthorizeUrlRequest`
-    * Added `client_credentials` to `DataIntegrationAuthMethods`
-    * Added `client_credentials` to `DataIntegrationsListResponseDataAuthMethods`
-    * Added `client_credentials` to `DataIntegrationsListResponseDataConnectedAccountAuthMethod`
-    * Added `config` to Pipes models
-  * **[connect](https://workos.com/docs/reference/workos-connect/standalone)**:
-    * Added `client_credentials` to `ConnectedAccountAuthMethod`
-
-  **Fixes**
-  * **[user_management](https://workos.com/docs/reference/authkit/user)**:
-    * Changed errors for endpoint `POST /user_management/invitations`
-    * Changed errors for endpoint `POST /user_management/invitations/{id}/resend`
-    * Changed errors for endpoint `POST /user_management/magic_auth`
-    * Changed errors for endpoint `POST /user_management/authenticate`
diff --git a/.changelog-pending/2026-07-28T20-32-59-c7b77690a4486560659df08d947039af4cd52055.md b/.changelog-pending/2026-07-28T20-32-59-c7b77690a4486560659df08d947039af4cd52055.md
deleted file mode 100644
index eb2b02f2..00000000
--- a/.changelog-pending/2026-07-28T20-32-59-c7b77690a4486560659df08d947039af4cd52055.md
+++ /dev/null
@@ -1,5 +0,0 @@
-* [#426](https://github.com/workos/workos-php/pull/426) fix(generated): regenerate from spec
-
-  **Fixes**
-  * **[sso](https://workos.com/docs/reference/sso)**:
-    * Removed `callback_endpoint` from `Connection`
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 92856693..9695e0ec 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "9.0.0"
+  ".": "9.1.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 234c326b..91a7481a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,37 @@
 # Changelog
 
+## [9.1.0](https://github.com/workos/workos-php/compare/v9.0.0...v9.1.0) (2026-07-29)
+
+### Features
+
+* **pkce:** Default clientId to the client's configured client ID ([#423](https://github.com/workos/workos-php/issues/423)) ([f65713b](https://github.com/workos/workos-php/commit/f65713b054f92d096ae3962c1a2e0bebbde64c7d))
+* support for guzzle 8 ([#427](https://github.com/workos/workos-php/issues/427)) ([81c2384](https://github.com/workos/workos-php/commit/81c2384c544e2329ab5fb098dbf43f285488cb1e))
+
+* [#425](https://github.com/workos/workos-php/pull/425) fix(generated): regenerate from spec
+
+  **Features**
+  * **[pipes](https://workos.com/docs/reference/pipes)**:
+    * Added `config` to `DataIntegrationsGetDataIntegrationAuthorizeUrlRequest`
+    * Added `client_credentials` to `DataIntegrationAuthMethods`
+    * Added `client_credentials` to `DataIntegrationsListResponseDataAuthMethods`
+    * Added `client_credentials` to `DataIntegrationsListResponseDataConnectedAccountAuthMethod`
+    * Added `config` to Pipes models
+  * **[connect](https://workos.com/docs/reference/workos-connect/standalone)**:
+    * Added `client_credentials` to `ConnectedAccountAuthMethod`
+
+  **Fixes**
+  * **[user_management](https://workos.com/docs/reference/authkit/user)**:
+    * Changed errors for endpoint `POST /user_management/invitations`
+    * Changed errors for endpoint `POST /user_management/invitations/{id}/resend`
+    * Changed errors for endpoint `POST /user_management/magic_auth`
+    * Changed errors for endpoint `POST /user_management/authenticate`
+
+* [#426](https://github.com/workos/workos-php/pull/426) fix(generated): regenerate from spec
+
+  **Fixes**
+  * **[sso](https://workos.com/docs/reference/sso)**:
+    * Removed `callback_endpoint` from `Connection`
+
 ## [9.0.0](https://github.com/workos/workos-php/compare/v8.1.0...v9.0.0) (2026-07-22)
 
 ### Miscellaneous Chores
diff --git a/lib/Version.php b/lib/Version.php
index 2a854b52..0a604c4f 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -9,5 +9,5 @@ final class Version
 {
     public const SDK_IDENTIFIER = 'WorkOS PHP';
 
-    public const SDK_VERSION = '9.0.0'; // x-release-please-version
+    public const SDK_VERSION = '9.1.0'; // x-release-please-version
 }