diff --git a/Assets/YooAsset/package.json b/Assets/YooAsset/package.json
index 5202fd5..78d19ba 100644
--- a/Assets/YooAsset/package.json
+++ b/Assets/YooAsset/package.json
@@ -1,7 +1,7 @@
 {
     "name": "com.tuyoogame.yooasset",
     "displayName": "YooAsset",
-    "version": "1.3.7",
+    "version": "1.4.0-preview",
     "unity": "2019.4",
     "description": "unity3d resources management system.",
     "author": {