diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac3613ac..57e6406b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly PHP SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [5.1.0] - 2023-01-31
+### Added:
+- Introduced support for an `application_info` config property which sets application metadata that may be used in LaunchDarkly analytics or other product features. This does not affect feature flag evaluations.
+
 ## [4.3.0] - 2023-01-31
 ### Added:
 - Introduced support for an `application_info` config property which sets application metadata that may be used in LaunchDarkly analytics or other product features. This does not affect feature flag evaluations.
diff --git a/src/LaunchDarkly/LDClient.php b/src/LaunchDarkly/LDClient.php
index 288a2b40..1834e3ea 100644
--- a/src/LaunchDarkly/LDClient.php
+++ b/src/LaunchDarkly/LDClient.php
@@ -34,7 +34,7 @@ class LDClient
      * The current SDK version.
      * @var string
      */
-    const VERSION = '5.0.0';
+    const VERSION = '5.1.0';
 
     protected string $_sdkKey;
     protected string $_baseUri;