diff --git a/.github/.release-please-manifest.json b/.github/.release-please-manifest.json
index 3bf2410..b5e9157 100644
--- a/.github/.release-please-manifest.json
+++ b/.github/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "5.1.4"
+  ".": "5.2.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 362ffcd..9d179f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [5.2.0](https://github.com/solapi/solapi-php/compare/v5.1.4...v5.2.0) (2026-11-12)
+
+
+### Features
+
+* **messages:** 고속접수(fast) 엔드포인트 전환 및 GroupCount.sendTotal 매핑 수정 ([06c33ee](https://github.com/solapi/solapi-php/commit/06c33ee99c052db245f6a107271eb708b0a599b3))
+* **messages:** 발송·그룹 조회를 고속접수(fast) 엔드포인트로 전환 ([f16b3b4](https://github.com/solapi/solapi-php/commit/f16b3b4d6e855057c9c4c29238a5d94638b61c5c))
+
+
+### Bug Fixes
+
+* **models:** GroupCount.sendTotal을 서버 응답 키 sentTotal에서 매핑 ([00f2c18](https://github.com/solapi/solapi-php/commit/00f2c18575735711b2190b0499fdb1172a9ad8c5))
+
 ## [5.1.4](https://github.com/solapi/solapi-php/compare/v5.1.3...v5.1.4) (2026-09-29)
 
 
diff --git a/composer.json b/composer.json
index 8bb9b65..fd08320 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
   "name": "solapi/sdk",
   "description": "SOLAPI SDK for PHP",
-  "version": "5.1.4",
+  "version": "5.2.0",
   "type": "library",
   "license": "MIT",
   "autoload": {
diff --git a/src/Models/Request/DefaultAgent.php b/src/Models/Request/DefaultAgent.php
index f6e58fe..a557dde 100644
--- a/src/Models/Request/DefaultAgent.php
+++ b/src/Models/Request/DefaultAgent.php
@@ -16,7 +16,7 @@ class DefaultAgent
 
     public function __construct()
     {
-        $this->sdkVersion = 'php/5.1.4'; // x-release-please-version
+        $this->sdkVersion = 'php/5.2.0'; // x-release-please-version
         $this->osPlatform = PHP_OS . " | " . phpversion();
     }
 }