diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38783b35..434f827d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 # Recurly PHP Client Library CHANGELOG
 
-## Version 2.6.0 (unreleased)
+## Version 2.6.0 (August 9th, 2016)
 
+* Upgraded to API V2.3: https://dev.recurly.com/v2.3/docs
 * Added support for `original_transaction` to `Recurly_Transaction` [#238](https://github.com/recurly/recurly-client-php/pull/238)
 * Added `Recurly_AccountBalance` [#239](https://github.com/recurly/recurly-client-php/pull/239)
 * Print warnings when using a deprecated version of the API. [#250](https://github.com/recurly/recurly-client-php/pull/250):
diff --git a/README.md b/README.md
index 09497e68..45f98128 100644
--- a/README.md
+++ b/README.md
@@ -43,12 +43,12 @@ date_default_timezone_set('America/Los_Angeles');
 
 If you're using [Composer](http://getcomposer.org/), you can simply add a
 dependency on `recurly/recurly-client` to your project's `composer.json` file.
-Here's an example of a dependency on 2.5:
+Here's an example of a dependency on 2.6:
 
 ```json
 {
     "require": {
-        "recurly/recurly-client": "2.5.*"
+        "recurly/recurly-client": "2.6.*"
     }
 }
 ```
diff --git a/lib/recurly/client.php b/lib/recurly/client.php
index 35aaa2c6..892e766f 100644
--- a/lib/recurly/client.php
+++ b/lib/recurly/client.php
@@ -44,7 +44,7 @@ class Recurly_Client
    */
   private $_acceptLanguage = 'en-US';
 
-  const API_CLIENT_VERSION = '2.5.3';
+  const API_CLIENT_VERSION = '2.6.0';
   const DEFAULT_ENCODING = 'UTF-8';
 
   const GET = 'GET';