diff --git a/build/web.txt b/build/web.txt
index 131cdae64c..fd02db3569 100644
--- a/build/web.txt
+++ b/build/web.txt
@@ -13,7 +13,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>{Name}</RootNamespace>
     <AssemblyName>{Name}</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
     <UseIISExpress>true</UseIISExpress>
     <IISExpressSSLPort />
     <IISExpressAnonymousAuthentication />