diff --git a/L4-P2.3-5 MVC-IoC-Autofac/L4-P1-5/packages.config b/L4-P2.3-5 MVC-IoC-Autofac/L4-P1-5/packages.config
index 08dd91d..c4eb19c 100644
--- a/L4-P2.3-5 MVC-IoC-Autofac/L4-P1-5/packages.config	
+++ b/L4-P2.3-5 MVC-IoC-Autofac/L4-P1-5/packages.config	
@@ -3,7 +3,7 @@
   <package id="Antlr" version="3.5.0.2" targetFramework="net472" />
   <package id="Autofac" version="4.9.4" targetFramework="net472" />
   <package id="Autofac.Mvc5" version="4.0.2" targetFramework="net472" />
-  <package id="bootstrap" version="3.3.7" targetFramework="net472" />
+  <package id="bootstrap" version="3.4.1" targetFramework="net472" />
   <package id="jQuery" version="3.3.1" targetFramework="net472" />
   <package id="jQuery.Validation" version="1.17.0" targetFramework="net472" />
   <package id="Microsoft.AspNet.Mvc" version="5.2.4" targetFramework="net472" />