diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1eb7ff8..c50f667 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@ All notable changes to this package will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 
+## [4.0.1] - 2023-04-26
+### Fixed
+- [GameObjectBrush] Set HideFlags of instantiated GameObject to HideFlags.None when painting
+- [GridInformation] Fix serialization of GridInformationKey/Value
+
 ## [4.0.0] - 2023-03-07
 ### Added
 - [RuleTile] Add RotatedMirror rule which checks neighbors using both the mirror and rotation Rule in addition to the standard rotation Rule
diff --git a/Editor/Brushes/GameObjectBrush/GameObjectBrush.cs b/Editor/Brushes/GameObjectBrush/GameObjectBrush.cs
index 48335dc..e96b1ee 100644
--- a/Editor/Brushes/GameObjectBrush/GameObjectBrush.cs
+++ b/Editor/Brushes/GameObjectBrush/GameObjectBrush.cs
@@ -592,10 +592,10 @@ private static void SetSceneCell(GridLayout grid, Transform parent, Vector3Int p
                     renderer.enabled = true;
                 }
             }
-
+            instance.hideFlags = HideFlags.None;
             Undo.RegisterCreatedObjectUndo(instance, "Paint GameObject");
+
             var anchorRatio = GetAnchorRatio(grid, anchor);
-            
             instance.transform.position = grid.LocalToWorld(grid.CellToLocalInterpolated(position) + grid.CellToLocalInterpolated(anchorRatio));
             instance.transform.localRotation = orientation;
             instance.transform.localScale = scale;
diff --git a/Runtime/GridInformation/GridInformation.cs b/Runtime/GridInformation/GridInformation.cs
index 091ccf0..d6f6373 100644
--- a/Runtime/GridInformation/GridInformation.cs
+++ b/Runtime/GridInformation/GridInformation.cs
@@ -23,12 +23,14 @@ internal enum GridInformationType
     [AddComponentMenu("Tilemap/Grid Information")]
     public class GridInformation : MonoBehaviour, ISerializationCallbackReceiver
     {
+        [Serializable]
         internal struct GridInformationValue
         {
             public GridInformationType type;
             public object data;
         }
 
+        [Serializable]
         internal struct GridInformationKey : IEquatable<GridInformationKey>
         {
             public Vector3Int position;
diff --git a/package.json b/package.json
index 7f93431..b60fc44 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "com.unity.2d.tilemap.extras",
   "displayName": "2D Tilemap Extras",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "unity": "2023.1",
   "description": "2D Tilemap Extras is a package that contains extra scripts for use with 2D Tilemap features in Unity. These include custom Tiles and Brushes for the Tilemap feature.\n\nThe following are included in the package:\nBrushes: GameObject Brush, Group Brush, Line Brush, Random Brush\nTiles: Animated Tile, Rule Tile, Rule Override Tile\nOther: Grid Information, Custom Rules for Rule Tile",
   "keywords": [
@@ -15,7 +15,7 @@
     "com.unity.modules.jsonserialize": "1.0.0"
   },
   "relatedPackages": {
-    "com.unity.2d.tilemap.extras.tests": "4.0.0"
+    "com.unity.2d.tilemap.extras.tests": "4.0.1"
   },
   "samples": [
     {
@@ -35,15 +35,15 @@
     }
   ],
   "_upm": {
-    "changelog": "### Added\n- [RuleTile] Add RotatedMirror rule which checks neighbors using both the mirror and rotation Rule in addition to the standard rotation Rule\n\n### Fixed\n- [GameObjectBrush] Validate size of GameObjectBrush when it changes"
+    "changelog": "### Fixed\n- [GameObjectBrush] Set HideFlags of instantiated GameObject to HideFlags.None when painting\n- [GridInformation] Fix serialization of GridInformationKey/Value"
   },
   "upmCi": {
-    "footprint": "9700ea727395a7b9e99c30cc1b6d3ab7f7007532"
+    "footprint": "e48f8942babb511d4a959a658cbe96fcbc536dfc"
   },
   "documentationUrl": "https://docs.unity3d.com/Packages/com.unity.2d.tilemap.extras@4.0/manual/index.html",
   "repository": {
     "url": "https://github.com/Unity-Technologies/2d-extras.git",
     "type": "git",
-    "revision": "9961725b5671e3bdfad54e45abc175e446f2131e"
+    "revision": "5c1725c663304c56eb3b1612a8dae90f4a0b9fa5"
   }
 }