diff --git a/Upload Attachment Example/Upload Attachment Example/packages.config b/Upload Attachment Example/Upload Attachment Example/packages.config
index e83cf11..5813092 100644
--- a/Upload Attachment Example/Upload Attachment Example/packages.config	
+++ b/Upload Attachment Example/Upload Attachment Example/packages.config	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="bootstrap" version="3.3.7" targetFramework="net461" />
+  <package id="bootstrap" version="3.4.1" targetFramework="net461" />
   <package id="jQuery" version="1.12.4" targetFramework="net461" />
   <package id="jQuery.UI.Combined" version="1.12.1" targetFramework="net461" />
   <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.7" targetFramework="net461" />