diff --git a/.github/actions/build-docs/action.yml b/.github/actions/build-docs/action.yml
index de2229a3..915b2df5 100644
--- a/.github/actions/build-docs/action.yml
+++ b/.github/actions/build-docs/action.yml
@@ -17,4 +17,4 @@ runs:
           --ignore-tags psalm-return \
           --visibility public \
           --defaultpackagename "LaunchDarkly" \
-          --title "LaunchDarkly PHP SDK 6.3.0" # x-release-please-version
+          --title "LaunchDarkly PHP SDK 6.4.0" # x-release-please-version
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5c753b44..8e67d254 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "6.3.0"
+  ".": "6.4.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f45f89e0..a8c5a277 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to the LaunchDarkly PHP SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [6.4.0](https://github.com/launchdarkly/php-server-sdk/compare/6.3.0...6.4.0) (2025-01-17)
+
+
+### Features
+
+* Add support for big segments ([#213](https://github.com/launchdarkly/php-server-sdk/issues/213)) ([bd6c50c](https://github.com/launchdarkly/php-server-sdk/commit/bd6c50c427e7bbb78171d00a6c1d337792822264))
+
 ## [6.3.0](https://github.com/launchdarkly/php-server-sdk/compare/6.2.0...6.3.0) (2024-10-22)
 
 
diff --git a/src/LaunchDarkly/LDClient.php b/src/LaunchDarkly/LDClient.php
index 0dcd419c..f859fa68 100644
--- a/src/LaunchDarkly/LDClient.php
+++ b/src/LaunchDarkly/LDClient.php
@@ -39,7 +39,7 @@ class LDClient
      * The current SDK version.
      * @var string
      */
-    const VERSION = '6.3.0'; // x-release-please-version
+    const VERSION = '6.4.0'; // x-release-please-version
 
     protected string $_sdkKey;
     protected string $_baseUri;