diff --git a/CHANGELOG.md b/CHANGELOG.md
index eca4663..1ed5761 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 Check our main [developer changelog](https://developer.paddle.com/?utm_source=dx&utm_medium=paddle-php-sdk) for information about changes to the Paddle Billing platform, the Paddle API, and other developer tools.
 
-## [Unreleased]
+## [1.9.0] - 2025-01-30
 
 ### Added
 
diff --git a/src/Client.php b/src/Client.php
index 5aff702..75b3a51 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -60,7 +60,7 @@
 
 class Client
 {
-    private const SDK_VERSION = '1.8.0';
+    private const SDK_VERSION = '1.9.0';
 
     public readonly LoggerInterface $logger;
     public readonly Options $options;