diff --git a/CHANGELOG.md b/CHANGELOG.md
index 24117d75..9ea74625 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
 
+## 8.8.0 (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.
+
 ## 8.7.5 (2026-09-09)
 
 ### Fixes
diff --git a/README.md b/README.md
index 410a4875..49220e3c 100644
--- a/README.md
+++ b/README.md
@@ -14,14 +14,14 @@ With Maven:
 <dependency>
     <groupId>com.gocardless</groupId>
     <artifactId>gocardless-pro</artifactId>
-    <version>8.7.5</version>
+    <version>8.8.0</version>
 </dependency>
 ```
 
 With Gradle:
 
 ```
-implementation 'com.gocardless:gocardless-pro:8.7.5'
+implementation 'com.gocardless:gocardless-pro:8.8.0'
 ```
 
 ## Initializing the client
diff --git a/build.gradle b/build.gradle
index b34f029a..d22f3dd6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,7 +29,7 @@ plugins {
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 group = 'com.gocardless'
-version = '8.7.5'
+version = '8.8.0'
 
 apply plugin: 'ch.raffael.pegdown-doclet'
 
diff --git a/src/main/java/com/gocardless/http/HttpClient.java b/src/main/java/com/gocardless/http/HttpClient.java
index bc9a4b96..a35413ff 100644
--- a/src/main/java/com/gocardless/http/HttpClient.java
+++ b/src/main/java/com/gocardless/http/HttpClient.java
@@ -35,7 +35,7 @@ public class HttpClient {
     private static final String DISALLOWED_USER_AGENT_CHARACTERS =
             "[^\\w!#$%&'\\*\\+\\-\\.\\^`\\|~]";
     private static final String USER_AGENT =
-            String.format("gocardless-pro-java/8.7.5 java/%s %s/%s %s/%s",
+            String.format("gocardless-pro-java/8.8.0 java/%s %s/%s %s/%s",
                     cleanUserAgentToken(System.getProperty("java.vm.specification.version")),
                     cleanUserAgentToken(System.getProperty("java.vm.name")),
                     cleanUserAgentToken(System.getProperty("java.version")),
@@ -49,7 +49,7 @@ public class HttpClient {
         builder.put("GoCardless-Version", "2015-07-06");
         builder.put("Accept", "application/json");
         builder.put("GoCardless-Client-Library", "gocardless-pro-java");
-        builder.put("GoCardless-Client-Version", "8.7.5");
+        builder.put("GoCardless-Client-Version", "8.8.0");
         HEADERS = builder.build();
     }
     private final OkHttpClient rawClient;