diff --git a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
index 4f081859..5bd4eac1 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
@@ -291,7 +291,7 @@ namespace MQTTnet.Client.Options
 #pragma warning disable CS0618 // Type or member is obsolete
                         CertificateValidationCallback = _tlsParameters.CertificateValidationCallback,
 #pragma warning restore CS0618 // Type or member is obsolete
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0
                         ApplicationProtocols = _tlsParameters.ApplicationProtocols,
 #endif
                         CertificateValidationHandler = _tlsParameters.CertificateValidationHandler,
diff --git a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
index f73ab3b7..9726fe0d 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Net.Security;
 using System.Security.Authentication;
@@ -31,9 +31,9 @@ namespace MQTTnet.Client.Options
         public IEnumerable<X509Certificate> Certificates { get; set; }
 #endif
 
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0
 	    public List<SslApplicationProtocol> ApplicationProtocols { get;set; }
-#endif 
+#endif
 
 	    public bool AllowUntrustedCertificates { get; set; }
 
diff --git a/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs b/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
index b5e2c261..138fabc3 100644
--- a/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
@@ -22,7 +22,7 @@ namespace MQTTnet.Client.Options
         public List<X509Certificate> Certificates { get; set; }
 #endif
 
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0
         public List<SslApplicationProtocol> ApplicationProtocols { get; set; }
 #endif
 
diff --git a/Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs b/Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs
index ce6936ca..6bcb7680 100644
--- a/Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs
+++ b/Source/MQTTnet/Implementations/MqttTcpChannel.Uwp.cs
@@ -75,23 +75,11 @@ namespace MQTTnet.Implementations
                     _socket.Control.IgnorableServerCertificateErrors.Add(ignorableChainValidationResult);
                 }
 
-#if NETCOREAPP3_1 || NET5_0
-                var socketProtectionLevel = SocketProtectionLevel.Tls13;
-                if (_options.TlsOptions.SslProtocol == SslProtocols.Tls12)
-                {
-                    socketProtectionLevel = SocketProtectionLevel.Tls12;
-                }
-                else if (_options.TlsOptions.SslProtocol == SslProtocols.Tls11)
-                {
-                    socketProtectionLevel = SocketProtectionLevel.Tls11;
-                }
-#else
                 var socketProtectionLevel = SocketProtectionLevel.Tls12;
                 if (_options.TlsOptions.SslProtocol == SslProtocols.Tls11)
                 {
                     socketProtectionLevel = SocketProtectionLevel.Tls11;
                 }
-#endif
                 else if (_options.TlsOptions.SslProtocol == SslProtocols.Tls)
                 {
                     socketProtectionLevel = SocketProtectionLevel.Tls10;
diff --git a/Source/MQTTnet/Implementations/MqttTcpChannel.cs b/Source/MQTTnet/Implementations/MqttTcpChannel.cs
index 6e308109..4cb58ec8 100644
--- a/Source/MQTTnet/Implementations/MqttTcpChannel.cs
+++ b/Source/MQTTnet/Implementations/MqttTcpChannel.cs
@@ -83,7 +83,7 @@ namespace MQTTnet.Implementations
                     var sslStream = new SslStream(networkStream, false, InternalUserCertificateValidationCallback);
                     try
                     {
-#if NETCOREAPP3_1
+#if NETCOREAPP3_1 || NET5_0
                         var sslOptions = new SslClientAuthenticationOptions
                         {
                             ApplicationProtocols = _tcpOptions.TlsOptions.ApplicationProtocols,
@@ -100,7 +100,7 @@ namespace MQTTnet.Implementations
                     }
                     catch
                     {
-#if NETSTANDARD2_1 || NETCOREAPP3_1
+#if NETSTANDARD2_1 || NETCOREAPP3_1 || NET5_0
                         await sslStream.DisposeAsync().ConfigureAwait(false);
 #else
                         sslStream.Dispose();
diff --git a/Source/MQTTnet/Implementations/MqttTcpServerListener.cs b/Source/MQTTnet/Implementations/MqttTcpServerListener.cs
index b7df3491..8f164fb5 100644
--- a/Source/MQTTnet/Implementations/MqttTcpServerListener.cs
+++ b/Source/MQTTnet/Implementations/MqttTcpServerListener.cs
@@ -98,7 +98,7 @@ namespace MQTTnet.Implementations
         {
             _socket?.Dispose();
 
-#if NETSTANDARD1_3 || NETSTANDARD2_0 || NET461 || NET472
+#if !NET452
             _tlsCertificate?.Dispose();
 #endif
         }
diff --git a/Source/MQTTnet/Implementations/PlatformAbstractionLayer.cs b/Source/MQTTnet/Implementations/PlatformAbstractionLayer.cs
index 6059d36e..b2692589 100644
--- a/Source/MQTTnet/Implementations/PlatformAbstractionLayer.cs
+++ b/Source/MQTTnet/Implementations/PlatformAbstractionLayer.cs
@@ -17,7 +17,7 @@ namespace MQTTnet.Implementations
 
         public static void Sleep(TimeSpan timeout)
         {
-#if NET452 || NETSTANDARD2_0 || NETSTANDARD2_1 || NETCOREAPP3_1
+#if !NETSTANDARD1_3
             System.Threading.Thread.Sleep(timeout);
 #else
             Task.Delay(timeout).Wait();