diff --git a/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj b/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
index 87f1e83..436e965 100644
--- a/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
+++ b/OutlookSwissPTTimetable/OutlookSwissPTTimetable.csproj
@@ -34,7 +34,7 @@
     <PublishUrl>ftp://127.0.0.1:21215/</PublishUrl>
     <InstallUrl>https://timetable.mbeer.ch/</InstallUrl>
     <TargetCulture>de</TargetCulture>
-    <ApplicationVersion>1.0.0.16</ApplicationVersion>
+    <ApplicationVersion>1.0.0.17</ApplicationVersion>
     <AutoIncrementApplicationRevision>true</AutoIncrementApplicationRevision>
     <UpdateEnabled>true</UpdateEnabled>
     <UpdateInterval>14</UpdateInterval>
@@ -52,6 +52,11 @@
       <ProductName>Microsoft .NET Framework 4.6.1 %28x86 und x64%29</ProductName>
       <Install>true</Install>
     </BootstrapperPackage>
+    <BootstrapperPackage Include=".NETFramework,Version=v4.8">
+      <Visible>False</Visible>
+      <ProductName>Microsoft .NET Framework 4.8 %28x86 und x64%29</ProductName>
+      <Install>true</Install>
+    </BootstrapperPackage>
     <BootstrapperPackage Include="Microsoft.Net.Framework.3.5.SP1">
       <Visible>False</Visible>
       <ProductName>.NET Framework 3.5 SP1</ProductName>
@@ -285,10 +290,11 @@
     <SignManifests>true</SignManifests>
   </PropertyGroup>
   <PropertyGroup>
-    <ManifestKeyFile>OutlookSwissPTTimetable_1_TemporaryKey.pfx</ManifestKeyFile>
+    <ManifestKeyFile>
+    </ManifestKeyFile>
   </PropertyGroup>
   <PropertyGroup>
-    <ManifestCertificateThumbprint>008E32577D27137A379046E9A3C6D6B92BA8787D</ManifestCertificateThumbprint>
+    <ManifestCertificateThumbprint>9B84BFD8340B7E0205571DBC188F324A5894D6AB</ManifestCertificateThumbprint>
   </PropertyGroup>
   <PropertyGroup>
     <SignAssembly>false</SignAssembly>
@@ -313,7 +319,7 @@
       <FlavorProperties GUID="{BAA0C2D2-18E2-41B9-852F-F413020CAA33}">
         <ProjectProperties HostName="Outlook" HostPackage="{29A7B9D7-A7F1-4328-8EF0-6B2D1A56B2C1}" OfficeVersion="15.0" VstxVersion="4.0" ApplicationType="Outlook" Language="cs" TemplatesPath="" DebugInfoExeName="#Software\Microsoft\Office\16.0\Outlook\InstallRoot\Path#outlook.exe" AddItemTemplatesGuid="{A58A78EB-1C92-4DDD-80CF-E8BD872ABFC4}" />
         <Host Name="Outlook" GeneratedCodeNamespace="OutlookSwissPTTimetable" PublishedHash="69C324AB27932AA2FBF2B7EA72250886FF164DE6" IconIndex="0">
-          <HostItem Name="ThisAddIn" Code="ThisAddIn.cs" CanonicalName="AddIn" PublishedHash="B5E8AE80E60EC6623871E4F37CEE7915B65BEEA6" CanActivate="false" IconIndex="1" Blueprint="ThisAddIn.Designer.xml" GeneratedCode="ThisAddIn.Designer.cs" />
+          <HostItem Name="ThisAddIn" Code="ThisAddIn.cs" CanonicalName="AddIn" PublishedHash="CD0DE6C1BD80E9A3CDB76E951E89EACB9303B767" CanActivate="false" IconIndex="1" Blueprint="ThisAddIn.Designer.xml" GeneratedCode="ThisAddIn.Designer.cs" />
         </Host>
       </FlavorProperties>
     </VisualStudio>
diff --git a/OutlookSwissPTTimetable/Properties/AssemblyInfo.cs b/OutlookSwissPTTimetable/Properties/AssemblyInfo.cs
index f38ea8a..ec05ef5 100644
--- a/OutlookSwissPTTimetable/Properties/AssemblyInfo.cs
+++ b/OutlookSwissPTTimetable/Properties/AssemblyInfo.cs
@@ -12,7 +12,7 @@
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("")]
 [assembly: AssemblyProduct("OutlookSwissPTTimetable")]
-[assembly: AssemblyCopyright("Copyright © 2018 Michael Beer")]
+[assembly: AssemblyCopyright("Copyright © 2018–2021 Michael Beer")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 
diff --git a/OutlookSwissPTTimetable/TransportOpendataCH.cs b/OutlookSwissPTTimetable/TransportOpendataCH.cs
index e149c84..c74435e 100644
--- a/OutlookSwissPTTimetable/TransportOpendataCH.cs
+++ b/OutlookSwissPTTimetable/TransportOpendataCH.cs
@@ -5,7 +5,6 @@
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
-using static System.Net.WebRequestMethods;
 
 namespace TransportOpendataCH
 {
@@ -51,6 +50,7 @@ private HttpWebRequest PrepareWebRequest()
             string Webstring = @"https://transport.opendata.ch/v1/connections?" + String.Join("&", parameters);
             
             Uri Webaddress = new Uri(Webstring);
+            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
             HttpWebRequest request = WebRequest.Create(Webaddress) as HttpWebRequest;
             request.Method = "GET";
             request.UserAgent = "Swiss public transport timetable add-in for Microsoft Outlook";