diff --git a/Editor/Extensions/SerializedPropertyExtension.cs b/Editor/Extensions/SerializedPropertyExtension.cs
index 0ac9018..b11ab03 100644
--- a/Editor/Extensions/SerializedPropertyExtension.cs
+++ b/Editor/Extensions/SerializedPropertyExtension.cs
@@ -1,4 +1,6 @@
 using System;
+using System.Collections;
+using System.Collections.Generic;
 using System.Globalization;
 using System.Reflection;
 using System.Runtime.CompilerServices;
diff --git a/package.json b/package.json
index 4247fb8..76b6acb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "com.module.inspector",
-  "version": "1.9.3",
+  "version": "1.9.4",
   "displayName": "Module.Inspector",
   "description": "Custom inspector with various useful property drawers",
   "unity": "2019.2",