diff --git a/Assets/ThirdPlugins/Easy Save 3/Scripts/ES3Prefab.cs b/Assets/ThirdPlugins/Easy Save 3/Scripts/ES3Prefab.cs
index c71d9b40..bdd28194 100644
--- a/Assets/ThirdPlugins/Easy Save 3/Scripts/ES3Prefab.cs	
+++ b/Assets/ThirdPlugins/Easy Save 3/Scripts/ES3Prefab.cs	
@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 using ES3Internal;
+using UnityEditor.Experimental.SceneManagement;
 #if UNITY_EDITOR
 using UnityEditor;
 #endif
@@ -90,7 +91,7 @@ namespace ES3Internal
         public void GeneratePrefabReferences()
         {
 #if UNITY_2018_3_OR_NEWER
-            if (this.gameObject.scene.name != null || UnityEditor.SceneManagement.PrefabStageUtility.GetCurrentPrefabStage() != null)
+            if (this.gameObject.scene.name != null || PrefabStageUtility.GetCurrentPrefabStage() != null)
 #else
             if (this.gameObject.scene.name != null)
 #endif
diff --git a/Packages/manifest.json b/Packages/manifest.json
index 46f0fcb5..c5ba926f 100644
--- a/Packages/manifest.json
+++ b/Packages/manifest.json
@@ -1,18 +1,18 @@
 {
   "dependencies": {
-    "com.unity.2d.animation": "7.0.6",
-    "com.unity.2d.pixel-perfect": "5.0.1",
-    "com.unity.2d.psdimporter": "6.0.4",
+    "com.unity.2d.animation": "3.2.18",
+    "com.unity.2d.pixel-perfect": "2.1.0",
+    "com.unity.2d.psdimporter": "2.1.11",
     "com.unity.2d.sprite": "1.0.0",
-    "com.unity.2d.spriteshape": "7.0.5",
+    "com.unity.2d.spriteshape": "3.0.18",
     "com.unity.2d.tilemap": "1.0.0",
-    "com.unity.collab-proxy": "1.17.2",
-    "com.unity.ide.rider": "3.0.15",
+    "com.unity.collab-proxy": "1.14.18",
+    "com.unity.ide.rider": "1.2.1",
     "com.unity.ide.visualstudio": "2.0.16",
     "com.unity.ide.vscode": "1.2.5",
-    "com.unity.test-framework": "1.1.31",
-    "com.unity.textmeshpro": "3.0.6",
-    "com.unity.timeline": "1.6.4",
+    "com.unity.test-framework": "1.1.33",
+    "com.unity.textmeshpro": "2.1.6",
+    "com.unity.timeline": "1.2.18",
     "com.unity.ugui": "1.0.0",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",
diff --git a/Packages/packages-lock.json b/Packages/packages-lock.json
index b5d3ebc9..2e62ec0a 100644
--- a/Packages/packages-lock.json
+++ b/Packages/packages-lock.json
@@ -1,11 +1,12 @@
 {
   "dependencies": {
     "com.unity.2d.animation": {
-      "version": "7.0.6",
+      "version": "3.2.18",
       "depth": 0,
       "source": "registry",
       "dependencies": {
-        "com.unity.2d.common": "6.0.3",
+        "com.unity.2d.common": "2.1.2",
+        "com.unity.mathematics": "1.1.0",
         "com.unity.2d.sprite": "1.0.0",
         "com.unity.modules.animation": "1.0.0",
         "com.unity.modules.uielements": "1.0.0"
@@ -13,38 +14,36 @@
       "url": "https://packages.unity.cn"
     },
     "com.unity.2d.common": {
-      "version": "6.0.3",
+      "version": "2.1.2",
       "depth": 1,
       "source": "registry",
       "dependencies": {
         "com.unity.2d.sprite": "1.0.0",
-        "com.unity.mathematics": "1.1.0",
-        "com.unity.modules.uielements": "1.0.0",
-        "com.unity.burst": "1.5.1"
+        "com.unity.modules.uielements": "1.0.0"
       },
       "url": "https://packages.unity.cn"
     },
     "com.unity.2d.path": {
-      "version": "5.0.2",
+      "version": "2.1.1",
       "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.cn"
     },
     "com.unity.2d.pixel-perfect": {
-      "version": "5.0.1",
+      "version": "2.1.0",
       "depth": 0,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.cn"
     },
     "com.unity.2d.psdimporter": {
-      "version": "6.0.4",
+      "version": "2.1.11",
       "depth": 0,
       "source": "registry",
       "dependencies": {
-        "com.unity.2d.animation": "7.0.6",
-        "com.unity.2d.common": "6.0.3",
+        "com.unity.2d.common": "2.1.2",
+        "com.unity.2d.animation": "3.2.17",
         "com.unity.2d.sprite": "1.0.0"
       },
       "url": "https://packages.unity.cn"
@@ -56,14 +55,13 @@
       "dependencies": {}
     },
     "com.unity.2d.spriteshape": {
-      "version": "7.0.5",
+      "version": "3.0.18",
       "depth": 0,
       "source": "registry",
       "dependencies": {
         "com.unity.mathematics": "1.1.0",
-        "com.unity.2d.common": "6.0.3",
-        "com.unity.2d.path": "5.0.2",
-        "com.unity.modules.physics2d": "1.0.0"
+        "com.unity.2d.common": "2.1.0",
+        "com.unity.2d.path": "2.1.1"
       },
       "url": "https://packages.unity.cn"
     },
@@ -73,22 +71,11 @@
       "source": "builtin",
       "dependencies": {}
     },
-    "com.unity.burst": {
-      "version": "1.6.6",
-      "depth": 2,
-      "source": "registry",
-      "dependencies": {
-        "com.unity.mathematics": "1.2.1"
-      },
-      "url": "https://packages.unity.cn"
-    },
     "com.unity.collab-proxy": {
-      "version": "1.17.2",
+      "version": "1.14.18",
       "depth": 0,
       "source": "registry",
-      "dependencies": {
-        "com.unity.services.core": "1.0.1"
-      },
+      "dependencies": {},
       "url": "https://packages.unity.cn"
     },
     "com.unity.ext.nunit": {
@@ -99,11 +86,11 @@
       "url": "https://packages.unity.cn"
     },
     "com.unity.ide.rider": {
-      "version": "3.0.15",
+      "version": "1.2.1",
       "depth": 0,
       "source": "registry",
       "dependencies": {
-        "com.unity.ext.nunit": "1.0.6"
+        "com.unity.test-framework": "1.1.1"
       },
       "url": "https://packages.unity.cn"
     },
@@ -124,32 +111,14 @@
       "url": "https://packages.unity.cn"
     },
     "com.unity.mathematics": {
-      "version": "1.2.6",
+      "version": "1.1.0",
       "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.cn"
     },
-    "com.unity.nuget.newtonsoft-json": {
-      "version": "3.0.2",
-      "depth": 2,
-      "source": "registry",
-      "dependencies": {},
-      "url": "https://packages.unity.cn"
-    },
-    "com.unity.services.core": {
-      "version": "1.4.0",
-      "depth": 1,
-      "source": "registry",
-      "dependencies": {
-        "com.unity.modules.unitywebrequest": "1.0.0",
-        "com.unity.nuget.newtonsoft-json": "3.0.2",
-        "com.unity.modules.androidjni": "1.0.0"
-      },
-      "url": "https://packages.unity.cn"
-    },
     "com.unity.test-framework": {
-      "version": "1.1.31",
+      "version": "1.1.33",
       "depth": 0,
       "source": "registry",
       "dependencies": {
@@ -160,7 +129,7 @@
       "url": "https://packages.unity.cn"
     },
     "com.unity.textmeshpro": {
-      "version": "3.0.6",
+      "version": "2.1.6",
       "depth": 0,
       "source": "registry",
       "dependencies": {
@@ -169,7 +138,7 @@
       "url": "https://packages.unity.cn"
     },
     "com.unity.timeline": {
-      "version": "1.6.4",
+      "version": "1.2.18",
       "depth": 0,
       "source": "registry",
       "dependencies": {
@@ -322,18 +291,6 @@
       "depth": 0,
       "source": "builtin",
       "dependencies": {
-        "com.unity.modules.ui": "1.0.0",
-        "com.unity.modules.imgui": "1.0.0",
-        "com.unity.modules.jsonserialize": "1.0.0",
-        "com.unity.modules.uielementsnative": "1.0.0"
-      }
-    },
-    "com.unity.modules.uielementsnative": {
-      "version": "1.0.0",
-      "depth": 1,
-      "source": "builtin",
-      "dependencies": {
-        "com.unity.modules.ui": "1.0.0",
         "com.unity.modules.imgui": "1.0.0",
         "com.unity.modules.jsonserialize": "1.0.0"
       }
diff --git a/ProjectSettings/ProjectVersion.txt b/ProjectSettings/ProjectVersion.txt
index d5797253..b9623c16 100644
--- a/ProjectSettings/ProjectVersion.txt
+++ b/ProjectSettings/ProjectVersion.txt
@@ -1,2 +1,2 @@
-m_EditorVersion: 2021.3.6f1c1
-m_EditorVersionWithRevision: 2021.3.6f1c1 (07401303b748)
+m_EditorVersion: 2019.4.40f1c1
+m_EditorVersionWithRevision: 2019.4.40f1c1 (bcafa7f80565)