diff --git a/src/HtmlSanitizer/Properties/AssemblyInfo.cs b/src/HtmlSanitizer/Properties/AssemblyInfo.cs
index 28af30f..9771814 100644
--- a/src/HtmlSanitizer/Properties/AssemblyInfo.cs
+++ b/src/HtmlSanitizer/Properties/AssemblyInfo.cs
@@ -13,4 +13,4 @@ using System.Runtime.InteropServices;
 
 #endif
 
-[assembly: AssemblyVersion("3.0.0.0")]
+[assembly: AssemblyVersion("4.0.0.0")]