diff --git a/Source/MQTTnet/Client/Options/IMqttClientOptions.cs b/Source/MQTTnet/Client/Options/IMqttClientOptions.cs
index 01e64f0f..565bf1ab 100644
--- a/Source/MQTTnet/Client/Options/IMqttClientOptions.cs
+++ b/Source/MQTTnet/Client/Options/IMqttClientOptions.cs
@@ -79,13 +79,13 @@ namespace MQTTnet.Client
         /// Gets the request problem information.
         /// Hint: MQTT 5 feature only.
         /// </summary>
-        bool? RequestProblemInformation { get; }
+        bool RequestProblemInformation { get; }
 
         /// <summary>
         /// Gets the request response information.
         /// Hint: MQTT 5 feature only.
         /// </summary>
-        bool? RequestResponseInformation { get; }
+        bool RequestResponseInformation { get; }
 
         /// <summary>
         /// Gets the session expiry interval.
@@ -97,7 +97,7 @@ namespace MQTTnet.Client
         /// Gets the topic alias maximum.
         /// This gives the maximum length of the topic alias.
         /// </summary>
-        ushort? TopicAliasMaximum { get; }
+        ushort TopicAliasMaximum { get; }
 
         /// <summary>
         /// Gets or sets the user properties.
diff --git a/Source/MQTTnet/Client/Options/MqttClientOptions.cs b/Source/MQTTnet/Client/Options/MqttClientOptions.cs
index 2b388edf..31286cd8 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptions.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptions.cs
@@ -79,13 +79,13 @@ namespace MQTTnet.Client
         /// Gets or sets the request problem information.
         /// Hint: MQTT 5 feature only.
         /// </summary>
-        public bool? RequestProblemInformation { get; set; }
+        public bool RequestProblemInformation { get; set; } = true;
 
         /// <summary>
         /// Gets or sets the request response information.
         /// Hint: MQTT 5 feature only.
         /// </summary>
-        public bool? RequestResponseInformation { get; set; }
+        public bool RequestResponseInformation { get; set; }
 
         /// <summary>
         /// Gets or sets the session expiry interval.
@@ -97,7 +97,7 @@ namespace MQTTnet.Client
         /// Gets or sets the topic alias maximum.
         /// This gives the maximum length of the topic alias.
         /// </summary>
-        public ushort? TopicAliasMaximum { get; set; }
+        public ushort TopicAliasMaximum { get; set; }
 
         /// <summary>
         /// Gets or sets the user properties.
diff --git a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
index 3016cd51..37d9fdf7 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
@@ -82,7 +82,7 @@ namespace MQTTnet.Client
             return this;
         }
 
-        public MqttClientOptionsBuilder WithTopicAliasMaximum(ushort? topicAliasMaximum)
+        public MqttClientOptionsBuilder WithTopicAliasMaximum(ushort topicAliasMaximum)
         {
             _options.TopicAliasMaximum = topicAliasMaximum;
             return this;
@@ -100,13 +100,13 @@ namespace MQTTnet.Client
             return this;
         }
 
-        public MqttClientOptionsBuilder WithRequestProblemInformation(bool? requestProblemInformation = true)
+        public MqttClientOptionsBuilder WithRequestProblemInformation(bool requestProblemInformation = true)
         {
             _options.RequestProblemInformation = requestProblemInformation;
             return this;
         }
 
-        public MqttClientOptionsBuilder WithRequestResponseInformation(bool? requestResponseInformation = true)
+        public MqttClientOptionsBuilder WithRequestResponseInformation(bool requestResponseInformation = true)
         {
             _options.RequestResponseInformation = requestResponseInformation;
             return this;
diff --git a/Source/MQTTnet/Packets/MqttConnectPacketProperties.cs b/Source/MQTTnet/Packets/MqttConnectPacketProperties.cs
index a1187480..e858b309 100644
--- a/Source/MQTTnet/Packets/MqttConnectPacketProperties.cs
+++ b/Source/MQTTnet/Packets/MqttConnectPacketProperties.cs
@@ -12,9 +12,9 @@ namespace MQTTnet.Packets
 
         public byte[] AuthenticationData { get; set; }
 
-        public bool? RequestProblemInformation { get; set; }
+        public bool RequestProblemInformation { get; set; } = true;
 
-        public bool? RequestResponseInformation { get; set; }
+        public bool RequestResponseInformation { get; set; }
 
         public ushort? ReceiveMaximum { get; set; }