diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index c98797a..7690267 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"5.0.0"}
+{".":"5.1.0"}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab9740e..65399a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [5.1.0](https://github.com/Flagsmith/flagsmith-php-client/compare/v5.0.0...v5.1.0) (2026-01-23)
+
+
+### Features
+
+* Support for PHP 8.5 ([#128](https://github.com/Flagsmith/flagsmith-php-client/issues/128)) ([241e9c5](https://github.com/Flagsmith/flagsmith-php-client/commit/241e9c5d58586cfbd4c71d5b1b9c34228b818e59))
+
 ## [5.0.0](https://github.com/Flagsmith/flagsmith-php-client/compare/v4.5.1...v5.0.0) (2025-12-04)
 
 
diff --git a/composer.json b/composer.json
index 79de6a0..d2a50a6 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "flagsmith/flagsmith-php-client",
     "type": "library",
-    "version": "5.0.0",
+    "version": "5.1.0",
     "license": "BSD-3-Clause",
     "authors": [
         {