diff --git a/PostScriptumMortarCalculator/Services/UpdateService.cs b/PostScriptumMortarCalculator/Services/UpdateService.cs
index 9d86f04..a722991 100644
--- a/PostScriptumMortarCalculator/Services/UpdateService.cs
+++ b/PostScriptumMortarCalculator/Services/UpdateService.cs
@@ -1,6 +1,7 @@
 #if (!DEBUG)
 using System.Reflection;
 #endif
+using System.Net;
 using System.Threading.Tasks;
 using Octokit;
 
@@ -17,6 +18,7 @@ public class UpdateService
         public UpdateService()
         {
             m_client = new GitHubClient(new ProductHeaderValue("PostScriptumMortarCalculator"));
+            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;
         }
         
         public async Task<UpdateInfo> CheckForUpdate()