diff --git a/ASPNet_SignalR/packages.config b/ASPNet_SignalR/packages.config
index 5f9f741..c134e95 100644
--- a/ASPNet_SignalR/packages.config
+++ b/ASPNet_SignalR/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Antlr" version="3.5.0.2" targetFramework="net461" />
-  <package id="bootstrap" version="3.3.7" targetFramework="net461" />
+  <package id="bootstrap" version="3.4.1" targetFramework="net461" />
   <package id="jQuery" version="3.3.1" targetFramework="net461" />
   <package id="jQuery.Validation" version="1.17.0" targetFramework="net461" />
   <package id="Microsoft.AspNet.Mvc" version="5.2.4" targetFramework="net461" />