diff --git a/pom.xml b/pom.xml
index ff2d73c..54e5266 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,8 +1,9 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>pw.yumc</groupId>
     <artifactId>MiaoScript</artifactId>
-    <version>0.9.1</version>
+    <version>0.9.3</version>
     <developers>
         <developer>
             <id>502647092</id>
@@ -53,6 +54,7 @@
     <properties>
         <env.GIT_COMMIT>DEV</env.GIT_COMMIT>
         <update.changes>
+            §620-09-21 §afeat: 完善 upgrade 逻辑;
             §620-08-27 §afeat: 新增ProtocolLib依赖;
             §620-07-28 §afeat: 新增框架升级功能;
             §620-06-23 §afeat: 支持自定义参数;
diff --git a/src/main/java/pw/yumc/MiaoScript/Base.java b/src/main/java/pw/yumc/MiaoScript/Base.java
index cff4006..b17019d 100644
--- a/src/main/java/pw/yumc/MiaoScript/Base.java
+++ b/src/main/java/pw/yumc/MiaoScript/Base.java
@@ -2,9 +2,9 @@ package pw.yumc.MiaoScript;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.stream.Collectors;
 
 /**
  * Created with IntelliJ IDEA
@@ -32,27 +32,51 @@ public class Base {
     }
 
     public String read(String path) throws IOException {
-        return new String(Files.readAllBytes(new File(path).toPath()), "UTF-8");
+        return new String(Files.readAllBytes(new File(path).toPath()), StandardCharsets.UTF_8);
     }
 
     public void save(String path, String content) throws IOException {
         File file = new File(path);
         file.getParentFile().mkdirs();
-        Files.write(file.toPath(), content.getBytes("UTF-8"));
+        Files.write(file.toPath(), content.getBytes(StandardCharsets.UTF_8));
     }
 
-    public void delete(String path) throws IOException {
-        delete(new File(path).toPath());
+    public boolean move(String source, String target) {
+        File file = new File(source);
+        return file.renameTo(new File(target));
+    }
+
+    public boolean delete(String path) throws IOException {
+        return delete(new File(path));
     }
 
     public void delete(Path path) throws IOException {
-        File file = path.toFile();
-        if (!file.exists()) { return; }
-        if (file.isDirectory()) {
-            for (Path f : Files.list(file.toPath()).collect(Collectors.toList())) {
-                delete(f);
+        delete(path.toFile());
+    }
+
+    public boolean delete(File file) throws IOException {
+        if (!file.exists()) {
+            return false;
+        }
+        if (file.isFile()) {
+            return file.delete();
+        }
+        File[] files = file.listFiles();
+        if (files != null) {
+            for (File f : files) {
+                if (f.isFile()) {
+                    if (!f.delete()) {
+                        f.deleteOnExit();
+                    }
+                } else {
+                    this.delete(f.getAbsolutePath());
+                }
             }
         }
-        Files.delete(path);
+        boolean result = file.delete();
+        if (!result) {
+            file.deleteOnExit();
+        }
+        return result;
     }
 }
diff --git a/src/main/resources/bios.js b/src/main/resources/bios.js
index 76bce52..c63db67 100644
--- a/src/main/resources/bios.js
+++ b/src/main/resources/bios.js
@@ -5,6 +5,18 @@ var global = this;
  */
 (function () {
     var loader;
+    global.engineDisable = function () {
+        global.engineDisableImpl && global.engineDisableImpl()
+        if (java.nio.file.Files.exists(java.nio.file.Paths.get(root, "old_node_modules"))) {
+            logger.info('Found old_node_modules folder delete...');
+            base.delete(java.nio.file.Paths.get(root, "old_node_modules"))
+        }
+        if (java.nio.file.Files.exists(java.nio.file.Paths.get(root, "upgrade"))) {
+            logger.info('Found upgrade file delete node_modules...');
+            base.delete(java.nio.file.Paths.get(root, "node_modules"))
+            base.delete(java.nio.file.Paths.get(root, "upgrade"))
+        }
+    };
     global.boot = function (root, logger) {
         global.scope = java.lang.System.getenv("MS_NODE_CORE_SCOPE") || "@ccms";
         global.log = logger;
@@ -24,16 +36,22 @@ var global = this;
         }
         if (java.nio.file.Files.exists(java.nio.file.Paths.get(root, "upgrade"))) {
             logger.info('Found upgrade file starting upgrade...');
-            base.delete(java.nio.file.Paths.get(root, "node_modules"))
+            base.move(java.nio.file.Paths.get(root, "node_modules"), java.nio.file.Paths.get(root, "old_node_modules"))
             base.delete(java.nio.file.Paths.get(root, "upgrade"))
         }
+        new java.lang.Thread(function () {
+            try {
+                base.delete(java.nio.file.Paths.get(root, "old_node_modules"))
+            } catch (ex) {
+            }
+        }, "MiaoScript node_modules clean thread").start()
         // Check Class Loader, Sometimes Server will can't found plugin.yml file
         loader = checkClassLoader();
         // Async Loading MiaoScript Engine
         new java.lang.Thread(function () {
             java.lang.Thread.currentThread().contextClassLoader = loader;
             load(java.lang.System.getenv("MS_NODE_CORE_PLOYFILL") || 'classpath:core/ployfill.js')(root, logger);
-            global.engineDisable = require(java.lang.System.getenv("MS_NODE_CORE_MODULE") || global.scope + '/core').default || function () {
+            global.engineDisableImpl = require(java.lang.System.getenv("MS_NODE_CORE_MODULE") || global.scope + '/core').default || function () {
                 logger.info('Error: abnormal Initialization MiaoScript Engine. Skip disable step...')
             };
         }, "MiaoScript thread").start()