diff --git a/pom.xml b/pom.xml
index de7aaa4..98973f4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>cn.lunadeer</groupId>
     <artifactId>Dominion</artifactId>
-    <version>1.30.12-beta</version>
+    <version>1.30.13-beta</version>
     <packaging>jar</packaging>
 
     <name>Dominion</name>
diff --git a/src/main/java/cn/lunadeer/dominion/dtos/DominionDTO.java b/src/main/java/cn/lunadeer/dominion/dtos/DominionDTO.java
index 882ee47..8e3057a 100644
--- a/src/main/java/cn/lunadeer/dominion/dtos/DominionDTO.java
+++ b/src/main/java/cn/lunadeer/dominion/dtos/DominionDTO.java
@@ -106,19 +106,19 @@ public class DominionDTO {
     }
 
     public static DominionDTO insert(DominionDTO dominion) {
-        String sql = "INSERT INTO dominion (" +
-                "owner, name, world, x1, y1, z1, x2, y2, z2, ";
+        StringBuilder sql = new StringBuilder("INSERT INTO dominion (" +
+                "owner, name, world, x1, y1, z1, x2, y2, z2, ");
         for (Flag f : Flag.getAllDominionFlags()) {
-            sql += f.getFlagName() + ", ";
+            sql.append(f.getFlagName()).append(", ");
         }
-        sql += "tp_location, join_message, leave_message";
-        sql += ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ";
+        sql.append("tp_location, join_message, leave_message");
+        sql.append(") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ");
         for (Flag f : Flag.getAllDominionFlags()) {
-            sql += f.getDefaultValue() + ", ";
+            sql.append(f.getDefaultValue()).append(", ");
         }
-        sql += "'default', ?, ?)";
-        sql += ") RETURNING *;";
-        List<DominionDTO> dominions = query(sql,
+        sql.append("'default', ?, ?");
+        sql.append(") RETURNING *;");
+        List<DominionDTO> dominions = query(sql.toString(),
                 dominion.getOwner(),
                 dominion.getName(),
                 dominion.getWorld(),
diff --git a/src/main/java/cn/lunadeer/dominion/dtos/PlayerPrivilegeDTO.java b/src/main/java/cn/lunadeer/dominion/dtos/PlayerPrivilegeDTO.java
index 6d694c5..faf2ecb 100644
--- a/src/main/java/cn/lunadeer/dominion/dtos/PlayerPrivilegeDTO.java
+++ b/src/main/java/cn/lunadeer/dominion/dtos/PlayerPrivilegeDTO.java
@@ -9,22 +9,25 @@ import java.util.*;
 public class PlayerPrivilegeDTO {
 
     public static PlayerPrivilegeDTO insert(PlayerPrivilegeDTO player) {
-        String sql = "INSERT INTO player_privilege (player_uuid, admin, dom_id, ";
+        StringBuilder sql = new StringBuilder("INSERT INTO player_privilege (player_uuid, admin, dom_id, ");
 
         for (Flag f : Flag.getAllPrivilegeFlags()) {
-            sql += f.getFlagName() + ", ";
+            sql.append(f.getFlagName()).append(", ");
         }
-        sql = sql.substring(0, sql.length() - 2);
+        sql = new StringBuilder(sql.substring(0, sql.length() - 2));
 
-        sql += ") VALUES ('" + player.getPlayerUUID() + "', " + player.getAdmin() + ", " + player.getDomID() + ", ";
+        sql.append(") VALUES ('")
+                .append(player.getPlayerUUID()).append("', ")
+                .append(player.getAdmin()).append(", ")
+                .append(player.getDomID()).append(", ");
 
         for (Flag f : Flag.getAllPrivilegeFlags()) {
-            sql += player.getFlagValue(f) + ", ";
+            sql.append(player.getFlagValue(f)).append(", ");
         }
-        sql = sql.substring(0, sql.length() - 2);
+        sql = new StringBuilder(sql.substring(0, sql.length() - 2));
 
-        sql += ") RETURNING *;";
-        List<PlayerPrivilegeDTO> players = query(sql);
+        sql.append(") RETURNING *;");
+        List<PlayerPrivilegeDTO> players = query(sql.toString());
         if (players.size() == 0) return null;
         return players.get(0);
     }