diff --git a/BackTest/packages.config b/BackTest/packages.config
index dbf2a38..f5f4f4f 100644
--- a/BackTest/packages.config
+++ b/BackTest/packages.config
@@ -11,7 +11,7 @@
   <package id="System.Collections.Specialized" version="4.3.0" targetFramework="net461" />
   <package id="System.Linq" version="4.3.0" targetFramework="net461" />
   <package id="System.Net.NameResolution" version="4.3.0" targetFramework="net461" />
-  <package id="System.Net.Security" version="4.3.0" targetFramework="net461" />
+  <package id="System.Net.Security" version="4.3.1" targetFramework="net461" />
   <package id="System.Net.Sockets" version="4.3.0" targetFramework="net461" />
   <package id="System.Runtime.Extensions" version="4.3.0" targetFramework="net461" />
   <package id="System.Runtime.InteropServices" version="4.3.0" targetFramework="net461" />