diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f33f8aa..8c4a2f8 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -31,6 +31,12 @@ jobs:
           apt install --yes --no-install-recommends ca-certificates
 
           apt install --yes --no-install-recommends dotnet8
+          
+          # Trust ASP.NET Core HTTPS development certificate so that GRPC server can be contacted through HTTPS.
+          # HTTPS connection is used in end-to-end GRPC tests.
+          dotnet dev-certs https
+          sudo -E dotnet dev-certs https -ep /usr/local/share/ca-certificates/aspnet/https.crt --format PEM
+          sudo update-ca-certificates
 
       - name: Restore nuget dependencies
         run: dotnet restore
diff --git a/src/FX.GrpcClient/Instance.cs b/src/FX.GrpcClient/Instance.cs
index 9e34af4..d49bec9 100644
--- a/src/FX.GrpcClient/Instance.cs
+++ b/src/FX.GrpcClient/Instance.cs
@@ -18,7 +18,7 @@ public class Instance
 
         public FXGrpcService.FXGrpcServiceClient Connect()
         {
-            var channel = GrpcChannel.ForAddress($"http://{serverFqdn}:{Port}");
+            var channel = GrpcChannel.ForAddress($"https://{serverFqdn}:{HttpsPort}");
             var client = new FXGrpcService.FXGrpcServiceClient(channel);
             return client;
         }
diff --git a/src/FX.Tests/E2ETests.cs b/src/FX.Tests/E2ETests.cs
index e825ae2..0a25042 100644
--- a/src/FX.Tests/E2ETests.cs
+++ b/src/FX.Tests/E2ETests.cs
@@ -19,7 +19,7 @@ private Process LaunchGrpcServer()
             var solutionDir = (new DirectoryInfo(Environment.CurrentDirectory)).Parent?.Parent?.Parent?.Parent?.Parent;
             var serviceExeDir = Path.Join(solutionDir.FullName, "src", "FX.GrpcService", "bin", "Debug", "net8.0");
 
-            var argsString = $"--urls http://localhost:{GrpcClient.Instance.Port}";
+            var argsString = $"--urls https://localhost:{GrpcClient.Instance.HttpsPort}";
 
             if (OperatingSystem.IsWindows())
             {