diff --git a/packages.config b/packages.config
index 33632d9..ce07fab 100644
--- a/packages.config
+++ b/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="bootstrap" version="3.3.7" targetFramework="net452" />
+  <package id="bootstrap" version="4.3.1" targetFramework="net452" />
   <package id="Bootstrap.Flat" version="3.3.4" targetFramework="net452" />
   <package id="EasyEncryption" version="1.0.2" targetFramework="net461" />
   <package id="jQuery" version="3.3.1" targetFramework="net452" />