diff --git a/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/ConfigureEndpointRabbitMQTransport.cs b/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/ConfigureEndpointRabbitMQTransport.cs
index 887338373..dea4c90a8 100644
--- a/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/ConfigureEndpointRabbitMQTransport.cs
+++ b/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/ConfigureEndpointRabbitMQTransport.cs
@@ -74,6 +74,6 @@ public override async Task<TransportInfrastructure> Initialize(HostSettings host
             return infrastructure;
         }
 
-        public List<string> QueuesToCleanup { get; } = new List<string>();
+        public List<string> QueuesToCleanup { get; } = [];
     }
 }
\ No newline at end of file
diff --git a/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/When_the_broker_connection_is_lost.cs b/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/When_the_broker_connection_is_lost.cs
index 9d88f8894..56c976431 100644
--- a/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/When_the_broker_connection_is_lost.cs
+++ b/src/NServiceBus.Transport.RabbitMQ.AcceptanceTests/When_the_broker_connection_is_lost.cs
@@ -70,7 +70,7 @@ async Task BreakConnectionBySendingInvalidMessage(CancellationToken cancellation
                     {
                         try
                         {
-                            var outgoingMessage = new OutgoingMessage("Foo", new Dictionary<string, string>(), new byte[0]);
+                            var outgoingMessage = new OutgoingMessage("Foo", [], new byte[0]);
                             var props = new DispatchProperties
                             {
                                 DiscardIfNotReceivedBefore =
diff --git a/src/NServiceBus.Transport.RabbitMQ.Tests/OutgoingMessageBuilder.cs b/src/NServiceBus.Transport.RabbitMQ.Tests/OutgoingMessageBuilder.cs
index db273029a..28df7a24a 100644
--- a/src/NServiceBus.Transport.RabbitMQ.Tests/OutgoingMessageBuilder.cs
+++ b/src/NServiceBus.Transport.RabbitMQ.Tests/OutgoingMessageBuilder.cs
@@ -78,8 +78,8 @@ public OutgoingMessageBuilder WithIntent(MessageIntent intent)
         Type eventType;
         string messageId = Guid.NewGuid().ToString();
         byte[] body;
-        Dictionary<string, string> headers = new Dictionary<string, string>();
-        DispatchProperties constraints = new DispatchProperties();
+        Dictionary<string, string> headers = [];
+        DispatchProperties constraints = [];
         DispatchConsistency dispatchConsistency = DispatchConsistency.Default;
     }
 }
\ No newline at end of file
diff --git a/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_from_classic_queues.cs b/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_from_classic_queues.cs
index 2580e17d4..7d97347fd 100644
--- a/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_from_classic_queues.cs
+++ b/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_from_classic_queues.cs
@@ -19,7 +19,7 @@ public override Task SetUp()
         [Test]
         public async Task Header_collection_is_null_after_redelivery_for_headerless_messages()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
             var headerCollectionWasNullOnFirstDelivery = false;
             var headerCollectionWasNullOnRedelivery = new TaskCompletionSource<bool>();
 
diff --git a/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_messages.cs b/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_messages.cs
index c2f39191f..7265a073c 100644
--- a/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_messages.cs
+++ b/src/NServiceBus.Transport.RabbitMQ.Tests/When_consuming_messages.cs
@@ -13,7 +13,7 @@ class When_consuming_messages : RabbitMqContext
         [Test]
         public async Task Should_block_until_a_message_is_available()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
             var transportOperations = new TransportOperations(new TransportOperation(message, new UnicastAddressTag(ReceiverQueue)));
 
             await messageDispatcher.Dispatch(transportOperations, new TransportTransaction());
@@ -26,7 +26,7 @@ public async Task Should_block_until_a_message_is_available()
         [Test]
         public void Should_be_able_to_receive_messages_without_headers()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
 
             using (var connection = connectionFactory.CreatePublishConnection())
             using (var channel = connection.CreateModel())
@@ -46,7 +46,7 @@ public void Should_be_able_to_receive_messages_without_headers()
         [Test]
         public void Should_move_message_without_message_id_to_error_queue()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
 
             using (var connection = connectionFactory.CreatePublishConnection())
             using (var channel = connection.CreateModel())
@@ -67,7 +67,7 @@ public void Should_move_message_without_message_id_to_error_queue()
         [Test]
         public async Task Should_handle_retries_for_messages_without_headers()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
             var numRetries = 0;
             var handled = new TaskCompletionSource<bool>();
 
@@ -109,7 +109,7 @@ public async Task Should_handle_retries_for_messages_without_headers()
         [Test]
         public async Task Header_collection_is_not_null_after_redelivery_for_headerless_messages()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
             var headerCollectionWasNullOnFirstDelivery = false;
             var headerCollectionWasNullOnRedelivery = new TaskCompletionSource<bool>();
 
@@ -154,7 +154,7 @@ public async Task Header_collection_is_not_null_after_redelivery_for_headerless_
         [Test]
         public void Should_up_convert_the_native_type_to_the_enclosed_message_types_header_if_empty()
         {
-            var message = new OutgoingMessage(Guid.NewGuid().ToString(), new Dictionary<string, string>(), Array.Empty<byte>());
+            var message = new OutgoingMessage(Guid.NewGuid().ToString(), [], Array.Empty<byte>());
 
             var typeName = typeof(MyMessage).FullName;
 
diff --git a/src/NServiceBus.Transport.RabbitMQ/Connection/ConnectionFactory.cs b/src/NServiceBus.Transport.RabbitMQ/Connection/ConnectionFactory.cs
index d1cd649e2..bdf57dc94 100644
--- a/src/NServiceBus.Transport.RabbitMQ/Connection/ConnectionFactory.cs
+++ b/src/NServiceBus.Transport.RabbitMQ/Connection/ConnectionFactory.cs
@@ -16,7 +16,7 @@ class ConnectionFactory
 
         readonly string endpointName;
         readonly global::RabbitMQ.Client.ConnectionFactory connectionFactory;
-        readonly List<AmqpTcpEndpoint> endpoints = new();
+        readonly List<AmqpTcpEndpoint> endpoints = [];
         readonly object lockObject = new();
 
         public ConnectionFactory(string endpointName, ConnectionConfiguration connectionConfiguration, X509Certificate2Collection clientCertificateCollection, bool disableRemoteCertificateValidation, bool useExternalAuthMechanism, TimeSpan heartbeatInterval, TimeSpan networkRecoveryInterval, List<(string hostName, int port, bool useTls)> additionalClusterNodes)
diff --git a/src/NServiceBus.Transport.RabbitMQ/RabbitMQTransport.cs b/src/NServiceBus.Transport.RabbitMQ/RabbitMQTransport.cs
index 0671f4be9..b6093d680 100644
--- a/src/NServiceBus.Transport.RabbitMQ/RabbitMQTransport.cs
+++ b/src/NServiceBus.Transport.RabbitMQ/RabbitMQTransport.cs
@@ -21,7 +21,7 @@ public class RabbitMQTransport : TransportDefinition
         PrefetchCountCalculation prefetchCountCalculation = maxConcurrency => 3 * maxConcurrency;
         TimeSpan timeToWaitBeforeTriggeringCircuitBreaker = TimeSpan.FromMinutes(2);
 
-        readonly List<(string hostName, int port, bool useTls)> additionalClusterNodes = new();
+        readonly List<(string hostName, int port, bool useTls)> additionalClusterNodes = [];
 
         /// <summary>
         /// Creates a new instance of the RabbitMQ transport.
diff --git a/src/NServiceBus.Transport.RabbitMQ/Sending/BasicPropertiesExtensions.cs b/src/NServiceBus.Transport.RabbitMQ/Sending/BasicPropertiesExtensions.cs
index 503a7f64b..390df2e6f 100644
--- a/src/NServiceBus.Transport.RabbitMQ/Sending/BasicPropertiesExtensions.cs
+++ b/src/NServiceBus.Transport.RabbitMQ/Sending/BasicPropertiesExtensions.cs
@@ -1,7 +1,6 @@
 namespace NServiceBus.Transport.RabbitMQ
 {
     using System;
-    using System.Collections.Generic;
     using System.Globalization;
     using System.Linq;
     using System.Text;
@@ -16,7 +15,7 @@ public static void Fill(this IBasicProperties properties, OutgoingMessage messag
                 properties.MessageId = message.MessageId;
             }
 
-            var messageHeaders = message.Headers ?? new Dictionary<string, string>();
+            var messageHeaders = message.Headers ?? [];
 
             var delayed = CalculateDelay(dispatchProperties, out var delay);