diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3c5f964..9cbd5663 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 <!-- This file is generated, please add to it using `knope document-change` in the client-library-templates repo -->
 # Changelog
 
+## 9.0.1 (2026-09-14)
+
+### Fixes
+
+- Bump crank dependency to v7.2.0 for oneOf schema support
+
 ## 9.0.0 (2026-09-14)
 
 ### Breaking Changes
diff --git a/README.md b/README.md
index b42d4fb0..bfbe6e52 100644
--- a/README.md
+++ b/README.md
@@ -14,14 +14,14 @@ With Maven:
 <dependency>
     <groupId>com.gocardless</groupId>
     <artifactId>gocardless-pro</artifactId>
-    <version>9.0.0</version>
+    <version>9.0.1</version>
 </dependency>
 ```
 
 With Gradle:
 
 ```
-implementation 'com.gocardless:gocardless-pro:9.0.0'
+implementation 'com.gocardless:gocardless-pro:9.0.1'
 ```
 
 ## Initializing the client
diff --git a/build.gradle b/build.gradle
index 91fafe33..21661059 100644
--- a/build.gradle
+++ b/build.gradle
@@ -29,7 +29,7 @@ plugins {
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 group = 'com.gocardless'
-version = '9.0.0'
+version = '9.0.1'
 
 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 0765fcbb..72a0d6aa 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/9.0.0 java/%s %s/%s %s/%s",
+            String.format("gocardless-pro-java/9.0.1 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", "9.0.0");
+        builder.put("GoCardless-Client-Version", "9.0.1");
         HEADERS = builder.build();
     }
     private final OkHttpClient rawClient;
diff --git a/src/main/java/com/gocardless/resources/BillingRequestTemplate.java b/src/main/java/com/gocardless/resources/BillingRequestTemplate.java
index 57718c86..0ecbad40 100644
--- a/src/main/java/com/gocardless/resources/BillingRequestTemplate.java
+++ b/src/main/java/com/gocardless/resources/BillingRequestTemplate.java
@@ -31,7 +31,7 @@ private BillingRequestTemplate() {
     private String mandateRequestDescription;
     private Map<String, String> mandateRequestMetadata;
     private String mandateRequestScheme;
-    private String mandateRequestVerify;
+    private MandateRequestVerify mandateRequestVerify;
     private Map<String, String> metadata;
     private String name;
     private String paymentRequestAmount;
@@ -111,7 +111,7 @@ public String getMandateRequestScheme() {
     /**
      * Verification preference for the mandate.
      */
-    public String getMandateRequestVerify() {
+    public MandateRequestVerify getMandateRequestVerify() {
         return mandateRequestVerify;
     }
 
@@ -192,6 +192,15 @@ public String getUpdatedAt() {
         return updatedAt;
     }
 
+    public enum MandateRequestVerify {
+        @SerializedName("minimum")
+        MINIMUM, @SerializedName("recommended")
+        RECOMMENDED, @SerializedName("when_available")
+        WHEN_AVAILABLE, @SerializedName("always")
+        ALWAYS, @SerializedName("unknown")
+        UNKNOWN
+    }
+
     /**
      * Represents a mandate request constraint resource returned from the API.
      *