diff --git a/.github/workflows/create_release.yaml b/.github/workflows/create_release.yaml
index 432af92..5be1083 100644
--- a/.github/workflows/create_release.yaml
+++ b/.github/workflows/create_release.yaml
@@ -14,6 +14,9 @@ jobs:
       - name: Checkout source
         uses: actions/checkout@v3
 
+      - name: Check version
+        run: if [ $(grep ${{ github.event.inputs.version }} src/SdkVersion.php -c) != 1 ]; then exit 1; fi
+
       - uses: shivammathur/setup-php@v2
         with:
           php-version: 7.1
diff --git a/composer.json b/composer.json
index 5dd7fcf..b41ecd1 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     "require-dev": {
         "ext-openssl": "*",
         "php-parallel-lint/php-parallel-lint": "^1.3.2",
-        "phpunit/phpunit": "^5.7.27 || ^9.6.10",
+        "phpunit/phpunit": "^5.7 || ^7.5 || ^8.5 || ^9.5",
         "psx/cache": "^v1.0.2"
     },
     "autoload": {
diff --git a/src/Api/ApiAction.php b/src/Api/ApiAction.php
index 75e8402..85916c7 100644
--- a/src/Api/ApiAction.php
+++ b/src/Api/ApiAction.php
@@ -7,6 +7,7 @@
 use Tpay\OpenApi\Dictionary\HttpCodesDictionary;
 use Tpay\OpenApi\Manager\Manager;
 use Tpay\OpenApi\Model\Objects\Authorization\Token;
+use Tpay\OpenApi\SdkVersion;
 use Tpay\OpenApi\Utilities\Logger;
 use Tpay\OpenApi\Utilities\TpayException;
 
@@ -39,7 +40,9 @@ public function __construct(Token $Token, bool $productionMode)
         $this->Token = $Token;
         $this->Curl = new Curl();
         $this->Manager = new Manager();
-        $this->clientName = 'tpay-com/tpay-openapi-php:2.3.0|PHP:'.phpversion();
+        $this->clientName
+            = 'tpay-com/tpay-openapi-php:'.SdkVersion::VERSION
+            .'|PHP:'.phpversion();
         $this->apiUrl = true === $this->productionMode
             ? ApiAction::TPAY_API_URL_PRODUCTION
             : ApiAction::TPAY_API_URL_SANDBOX;
diff --git a/src/SdkVersion.php b/src/SdkVersion.php
new file mode 100644
index 0000000..fa38c92
--- /dev/null
+++ b/src/SdkVersion.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Tpay\OpenApi;
+
+final class SdkVersion
+{
+    const VERSION = '2.3.0';
+}