diff --git a/VERSION b/VERSION
index 40c688ba36..a36c75923d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.1.stable
+5.2.stable
diff --git a/config/config.php b/config/config.php
index 6dd1b548ff..171e3bb70e 100644
--- a/config/config.php
+++ b/config/config.php
@@ -17,7 +17,7 @@ if(!function_exists('getWebRoot')){function getWebRoot(){}}
 
 /* Basic settings. */
 $config = new config();
-$config->version      = '5.1';             // The version of zentaopms. Don't change it.
+$config->version      = '5.2';             // The version of zentaopms. Don't change it.
 $config->charset      = 'UTF-8';           // The charset of zentaopms.
 $config->cookieLife   = time() + 2592000;  // The cookie life time.
 $config->timezone     = 'Asia/Shanghai';   // The time zone setting, for more see http://www.php.net/manual/en/timezones.php
diff --git a/module/upgrade/lang/en.php b/module/upgrade/lang/en.php
index a8465b1e2e..0230773ed7 100644
--- a/module/upgrade/lang/en.php
+++ b/module/upgrade/lang/en.php
@@ -76,3 +76,4 @@ $lang->upgrade->fromVersions['4_3_beta']  = '4.3.beta';
 $lang->upgrade->fromVersions['5_0_beta1'] = '5.0.beta1';
 $lang->upgrade->fromVersions['5_0_beta2'] = '5.0.beta2';
 $lang->upgrade->fromVersions['5_0']       = '5.0';
+$lang->upgrade->fromVersions['5_1']       = '5.1';
diff --git a/module/upgrade/lang/zh-cn.php b/module/upgrade/lang/zh-cn.php
index 67b959e2e6..8b241f7c60 100644
--- a/module/upgrade/lang/zh-cn.php
+++ b/module/upgrade/lang/zh-cn.php
@@ -76,3 +76,4 @@ $lang->upgrade->fromVersions['4_3_beta']  = '4.3.beta';
 $lang->upgrade->fromVersions['5_0_beta1'] = '5.0.beta1';
 $lang->upgrade->fromVersions['5_0_beta2'] = '5.0.beta2';
 $lang->upgrade->fromVersions['5_0']       = '5.0';
+$lang->upgrade->fromVersions['5_1']       = '5.1';
diff --git a/module/upgrade/model.php b/module/upgrade/model.php
index 2f1f62deae..142499590d 100644
--- a/module/upgrade/model.php
+++ b/module/upgrade/model.php
@@ -96,6 +96,7 @@ class upgradeModel extends model
             case '5_0_beta1':
             case '5_0_beta2':
             case '5_0':
+            case '5_1':
 
             default: if(!$this->isError()) $this->setting->updateVersion($this->config->version);
         }
@@ -150,6 +151,8 @@ class upgradeModel extends model
         case '4_3_beta':  $confirmContent .= file_get_contents($this->getUpgradeFile('4.3'));
         case '5_0_beta1':
         case '5_0_beta2':
+        case '5_0':
+        case '5_1':
         }
         return str_replace('zt_', $this->config->db->prefix, $confirmContent);
     }