diff --git a/neo.UnitTests/Network/RPC/UT_RpcClient.cs b/neo.UnitTests/Network/RPC/UT_RpcClient.cs
index 24ed912e93..eb256cc6d1 100644
--- a/neo.UnitTests/Network/RPC/UT_RpcClient.cs
+++ b/neo.UnitTests/Network/RPC/UT_RpcClient.cs
@@ -570,7 +570,7 @@ public void TestConstructorByUrlAndDispose()
             //dummy url for test
             var client = new RpcClient("http://www.xxx.yyy");
             Action action = () => client.Dispose();
-            action.ShouldNotThrow<Exception>();
+            action.Should().NotThrow<Exception>();
         }
     }
 }
diff --git a/neo.UnitTests/Network/RPC/UT_RpcServer.cs b/neo.UnitTests/Network/RPC/UT_RpcServer.cs
index 931d7b1e17..fae945a21a 100644
--- a/neo.UnitTests/Network/RPC/UT_RpcServer.cs
+++ b/neo.UnitTests/Network/RPC/UT_RpcServer.cs
@@ -41,8 +41,8 @@ public void TestMaxGasInvoke()
         [TestMethod]
         public void TestStart()
         {
-            Action action = () => server.Start(IPAddress.Parse("127.0.0.1"), 8080);
-            action.ShouldNotThrow<Exception>();
+            Action action = () => server.Start(IPAddress.Parse("127.0.0.1"), 8999);
+            action.Should().NotThrow<Exception>();
         }
     }
 }