diff --git a/Ink Canvas/AssemblyInfo.cs b/Ink Canvas/AssemblyInfo.cs
index 8f8fb36e..1f1d5c72 100644
--- a/Ink Canvas/AssemblyInfo.cs	
+++ b/Ink Canvas/AssemblyInfo.cs	
@@ -49,5 +49,5 @@ using System.Windows;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.7.11.3")]
-[assembly: AssemblyFileVersion("1.7.11.3")]
+[assembly: AssemblyVersion("1.7.11.4")]
+[assembly: AssemblyFileVersion("1.7.11.4")]
diff --git a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs
index 4944ee0e..aa197665 100644
--- a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
@@ -643,7 +643,7 @@ namespace Ink_Canvas
                         eraserWidth = boundWidth;
                         UpdateEraserStyle();
                         // 显示初始橡皮擦反馈位置
-                        var touchPoint = e.GetTouchPoint(inkCanvas);
+                        touchPoint = e.GetTouchPoint(inkCanvas);
                         EraserOverlay_PointerDown(sender);
                         EraserOverlay_PointerMove(sender, touchPoint.Position);
                     }
diff --git a/Ink Canvas/Properties/AssemblyInfo.cs b/Ink Canvas/Properties/AssemblyInfo.cs
index 8f8fb36e..1f1d5c72 100644
--- a/Ink Canvas/Properties/AssemblyInfo.cs	
+++ b/Ink Canvas/Properties/AssemblyInfo.cs	
@@ -49,5 +49,5 @@ using System.Windows;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.7.11.3")]
-[assembly: AssemblyFileVersion("1.7.11.3")]
+[assembly: AssemblyVersion("1.7.11.4")]
+[assembly: AssemblyFileVersion("1.7.11.4")]