diff --git a/samples/aspnet-file-handler/PnpFileHandler/packages.config b/samples/aspnet-file-handler/PnpFileHandler/packages.config
index 9840572..8ab41af 100644
--- a/samples/aspnet-file-handler/PnpFileHandler/packages.config
+++ b/samples/aspnet-file-handler/PnpFileHandler/packages.config
@@ -2,7 +2,7 @@
 <packages>
   <package id="AngleSharp" version="0.9.9" targetFramework="net461" />
   <package id="Antlr" version="3.4.1.9004" targetFramework="net452" />
-  <package id="bootstrap" version="3.0.0" targetFramework="net452" />
+  <package id="bootstrap" version="3.4.1" targetFramework="net452" />
   <package id="EntityFramework" version="6.1.3" targetFramework="net452" />
   <package id="jQuery" version="1.10.2" targetFramework="net452" />
   <package id="jQuery.Validation" version="1.11.1" targetFramework="net452" />