diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8914d770..347d4218 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,22 @@
 <!-- This file is generated, please add to it using `knope document-change` in the client-library-templates repo -->
 # Changelog
 
+## 9.1.0 (2026-09-11)
+
+### Features
+
+#### Use specific sub-endpoints URLs for create /instalment_schedules: with_schedule and with_dates
+
+The two variants for creating an instalment_schedule were surfaced as separate functions. However, they both went to the same URL and endpoint on the backend.
+
+This created some bugs in generating our openapi schema and therefore our API reference documentation.
+
+Therefore, we've added specific URLs for each endpoint aliased to the original one: `POST /instalment_schedules/with_dates` or `POST /instalment_schedules/with_schedule`.
+
+The existing POST /instalment_schedules endpoint is unchanged and will remain available for the foreseeable future.
+
+Client libraries will now use the specific endpoint matching the method - if you are stubbing the HTTP call you may need to update those stubs.
+
 ## 9.0.2 (2026-09-09)
 
 ### Fixes
diff --git a/package-lock.json b/package-lock.json
index 4c6a3d16..fa5c2dff 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "gocardless-nodejs",
-  "version": "9.0.2",
+  "version": "9.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "gocardless-nodejs",
-      "version": "9.0.2",
+      "version": "9.1.0",
       "license": "MIT",
       "dependencies": {
         "got": "^11.8.6",
diff --git a/package.json b/package.json
index e02ea97f..7b209128 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gocardless-nodejs",
-  "version": "9.0.2",
+  "version": "9.1.0",
   "description": "Node.js client for the GoCardless API - a powerful, simple solution for the collection of recurring bank-to-bank payments",
   "author": "GoCardless Ltd <client-libraries@gocardless.com>",
   "repository": {
diff --git a/src/codeSamples/instalment_schedulesCodeSamples.test.ts b/src/codeSamples/instalment_schedulesCodeSamples.test.ts
index ede8da77..942ed1b0 100644
--- a/src/codeSamples/instalment_schedulesCodeSamples.test.ts
+++ b/src/codeSamples/instalment_schedulesCodeSamples.test.ts
@@ -34,7 +34,7 @@ describe('InstalmentSchedules Code Samples', () => {
 
   test('create_with_dates code sample executes without error', async () => {
     // Convert :param placeholders to regex wildcards for flexible matching
-    const stubUrl = '/instalment_schedules';
+    const stubUrl = '/instalment_schedules/create_with_dates';
     const pathPattern = new RegExp('^' + stubUrl.replace(/:[\w]+/g, '[^/?]+') + '(?:\\?.*)?$');
 
     // Mock response - repeat multiple times to handle code samples with multiple API calls
@@ -85,7 +85,7 @@ describe('InstalmentSchedules Code Samples', () => {
 
   test('create_with_schedule code sample executes without error', async () => {
     // Convert :param placeholders to regex wildcards for flexible matching
-    const stubUrl = '/instalment_schedules';
+    const stubUrl = '/instalment_schedules/create_with_schedule';
     const pathPattern = new RegExp('^' + stubUrl.replace(/:[\w]+/g, '[^/?]+') + '(?:\\?.*)?$');
 
     // Mock response - repeat multiple times to handle code samples with multiple API calls
diff --git a/src/constants.ts b/src/constants.ts
index fccd49b9..70998c0f 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -3,7 +3,7 @@ enum Environments {
   Sandbox = 'SANDBOX',
 }
 
-const CLIENT_VERSION = '9.0.2';
+const CLIENT_VERSION = '9.1.0';
 const API_VERSION = '2015-07-06';
 
 export { Environments, CLIENT_VERSION, API_VERSION };
diff --git a/src/services/instalmentScheduleService.ts b/src/services/instalmentScheduleService.ts
index 1997c6ac..a435427c 100644
--- a/src/services/instalmentScheduleService.ts
+++ b/src/services/instalmentScheduleService.ts
@@ -250,7 +250,7 @@ export class InstalmentScheduleService {
   ): Promise<InstalmentScheduleResponse> {
     const urlParameters = [];
     const requestParams = {
-      path: '/instalment_schedules',
+      path: '/instalment_schedules/create_with_dates',
       method: 'post',
       urlParameters,
       requestParameters,
@@ -276,7 +276,7 @@ export class InstalmentScheduleService {
   ): Promise<InstalmentScheduleResponse> {
     const urlParameters = [];
     const requestParams = {
-      path: '/instalment_schedules',
+      path: '/instalment_schedules/create_with_schedule',
       method: 'post',
       urlParameters,
       requestParameters,