diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2cebde..2e8e046 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,11 @@ backwards-incompatible changes that will affect existing usage.
 
 <!-- CHANGELOG_PLACEHOLDER -->
 
+## 9.15.0 - 2023-05-22
+
+- Update Curl::diagnose() to detect bit flags with negative values ([#781](https://github.com/php-curl-class/php-curl-class/pull/781))
+- Display bit flags in use when calling Curl::diagnose() ([#779](https://github.com/php-curl-class/php-curl-class/pull/779))
+
 ## 9.14.5 - 2023-05-16
 
 - Handle missing content-type response header in Curl::diagnose() ([#778](https://github.com/php-curl-class/php-curl-class/pull/778))
diff --git a/src/Curl/Curl.php b/src/Curl/Curl.php
index db1babd..0c839e1 100644
--- a/src/Curl/Curl.php
+++ b/src/Curl/Curl.php
@@ -8,7 +8,7 @@ use Curl\Url;
 
 class Curl extends BaseCurl
 {
-    const VERSION = '9.14.5';
+    const VERSION = '9.15.0';
     const DEFAULT_TIMEOUT = 30;
 
     public $curl = null;