diff --git a/scripts/project_update.py b/scripts/project_update.py
index 0aa2602..7579352 100644
--- a/scripts/project_update.py
+++ b/scripts/project_update.py
@@ -229,6 +229,10 @@ storePassword=123456
                 FileUtils.delete(dst, True)
             FileUtils.decompress(res_path, temp_dst)
 
+            build_path = os.path.join(temp_dst, "build")
+            if os.path.exists(build_path):
+                FileUtils.delete(build_path, True)
+
             if os.listdir(temp_dst).index("unityLibrary") >= 0:
                 FileUtils.copy(os.path.join(temp_dst, "unityLibrary"), dst)
             else:
@@ -239,7 +243,8 @@ storePassword=123456
             text = text.replace("compileSdkVersion", """
     namespace "com.unity3d.player"
     compileSdkVersion""")
-            text = text.replace("unityStreamingAssets.tokenize(', ')", '[".unity3d", ".bundle", ".version", ".bytes", ".hash"]')
+            text = text.replace("unityStreamingAssets.tokenize(', ')",
+                                '[".unity3d", ".bundle", ".version", ".bytes", ".hash"]')
             text = text.replace("apply plugin: 'com.android.library'", """
 plugins {
     id 'com.android.library'