diff --git a/.codegen.json b/.codegen.json
index c47dbe570..b8fed1572 100644
--- a/.codegen.json
+++ b/.codegen.json
@@ -1 +1 @@
-{ "engineHash": "c571efa", "specHash": "f899bf6", "version": "5.8.0" }
+{ "engineHash": "c571efa", "specHash": "f899bf6", "version": "5.9.0" }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index df2f1c104..3872719c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+## [5.9.0](https://github.com/box/box-java-sdk/compare/v5.8.0...v5.9.0) (2026-04-30)
+
+
+### Bug Fixes:
+
+* **boxsdkgen:** Fix java `oneOf` serialization (box/box-codegen[#942](https://github.com/box/box-java-sdk/issues/942)) ([#1805](https://github.com/box/box-java-sdk/issues/1805)) ([cf0d67f](https://github.com/box/box-java-sdk/commit/cf0d67fa25af2ef4b9458362e9e896ce50674e62))
+
+
+### New Features and Enhancements:
+
+* **boxsdkgen:** Automate Public API (box/box-openapi[#594](https://github.com/box/box-java-sdk/issues/594)) ([#1816](https://github.com/box/box-java-sdk/issues/1816)) ([4369d9c](https://github.com/box/box-java-sdk/commit/4369d9c45ca6ff5d3045e7e193335560eb886b6f))
+
 ## [5.8.0](https://github.com/box/box-java-sdk/compare/v5.7.0...v5.8.0) (2026-04-22)
 
 
diff --git a/build.gradle b/build.gradle
index 57abacfcb..779fa1662 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@ sourceCompatibility = 1.8
 
 group = "com.box"
 archivesBaseName = "box-java-sdk"
-version = "5.8.0"
+version = "5.9.0"
 
 java {
     withJavadocJar()
diff --git a/src/main/java/com/box/sdk/BoxAPIConnection.java b/src/main/java/com/box/sdk/BoxAPIConnection.java
index 949b46b36..e6e95ae82 100644
--- a/src/main/java/com/box/sdk/BoxAPIConnection.java
+++ b/src/main/java/com/box/sdk/BoxAPIConnection.java
@@ -91,7 +91,7 @@ public class BoxAPIConnection {
   private static final String BOX_NOTIFICATIONS_HEADER = "Box-Notifications";
 
   private static final String JAVA_VERSION = System.getProperty("java.version");
-  private static final String SDK_VERSION = "5.8.0";
+  private static final String SDK_VERSION = "5.9.0";
 
   /**
    * The amount of buffer time, in milliseconds, to use when determining if an access token should
diff --git a/src/main/java/com/box/sdkgen/networking/version/Version.java b/src/main/java/com/box/sdkgen/networking/version/Version.java
index 8b3c171eb..e7a7479b4 100644
--- a/src/main/java/com/box/sdkgen/networking/version/Version.java
+++ b/src/main/java/com/box/sdkgen/networking/version/Version.java
@@ -3,6 +3,6 @@
 public class Version {
 
   public static String getVersion() {
-    return "5.8.0";
+    return "5.9.0";
   }
 }