diff --git a/CHANGELOG.md b/CHANGELOG.md
index d354fed..254dc60 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## v3.5.3-TBD
+
+### optimized
+
+- optimize: 支付宝公钥使用公共函数获取(#835)
+
 ## v3.5.2
 
 ### fixed
diff --git a/src/Plugin/Alipay/PreparePlugin.php b/src/Plugin/Alipay/PreparePlugin.php
index 37ce57f..4d0f445 100644
--- a/src/Plugin/Alipay/PreparePlugin.php
+++ b/src/Plugin/Alipay/PreparePlugin.php
@@ -16,6 +16,7 @@ use Yansongda\Pay\Pay;
 use Yansongda\Pay\Rocket;
 
 use function Yansongda\Pay\get_alipay_config;
+use function Yansongda\Pay\get_public_cert;
 use function Yansongda\Pay\get_tenant;
 
 class PreparePlugin implements PluginInterface
@@ -108,8 +109,7 @@ class PreparePlugin implements PluginInterface
             throw new InvalidConfigException(Exception::ALIPAY_CONFIG_ERROR, 'Missing Alipay Config -- [app_public_cert_path]');
         }
 
-        $cert = file_get_contents($path);
-        $ssl = openssl_x509_parse($cert);
+        $ssl = openssl_x509_parse(get_public_cert($path));
 
         if (false === $ssl) {
             throw new InvalidConfigException(Exception::ALIPAY_CONFIG_ERROR, 'Parse `app_public_cert_path` Error');