diff --git a/src/MassTransit.Abstractions/MassTransit.Abstractions.csproj b/src/MassTransit.Abstractions/MassTransit.Abstractions.csproj
index 83dab4e9891..5d19ee14ac2 100644
--- a/src/MassTransit.Abstractions/MassTransit.Abstractions.csproj
+++ b/src/MassTransit.Abstractions/MassTransit.Abstractions.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../signing.props"/>
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/MassTransit.StateMachineVisualizer/MassTransit.StateMachineVisualizer.csproj b/src/MassTransit.StateMachineVisualizer/MassTransit.StateMachineVisualizer.csproj
index 884d27e0161..d1c15ae1b73 100644
--- a/src/MassTransit.StateMachineVisualizer/MassTransit.StateMachineVisualizer.csproj
+++ b/src/MassTransit.StateMachineVisualizer/MassTransit.StateMachineVisualizer.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/MassTransit.TestFramework/MassTransit.TestFramework.csproj b/src/MassTransit.TestFramework/MassTransit.TestFramework.csproj
index 0558221d5a8..af40d933508 100644
--- a/src/MassTransit.TestFramework/MassTransit.TestFramework.csproj
+++ b/src/MassTransit.TestFramework/MassTransit.TestFramework.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/MassTransit/MassTransit.csproj b/src/MassTransit/MassTransit.csproj
index b3a27f7d095..eb450826a3f 100644
--- a/src/MassTransit/MassTransit.csproj
+++ b/src/MassTransit/MassTransit.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.Azure.Cosmos/MassTransit.Azure.Cosmos.csproj b/src/Persistence/MassTransit.Azure.Cosmos/MassTransit.Azure.Cosmos.csproj
index e911b65b1fb..4bd3c797f74 100644
--- a/src/Persistence/MassTransit.Azure.Cosmos/MassTransit.Azure.Cosmos.csproj
+++ b/src/Persistence/MassTransit.Azure.Cosmos/MassTransit.Azure.Cosmos.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.Azure.Storage/MassTransit.Azure.Storage.csproj b/src/Persistence/MassTransit.Azure.Storage/MassTransit.Azure.Storage.csproj
index ee4d0e103fe..3df56dfb55f 100644
--- a/src/Persistence/MassTransit.Azure.Storage/MassTransit.Azure.Storage.csproj
+++ b/src/Persistence/MassTransit.Azure.Storage/MassTransit.Azure.Storage.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.Azure.Table/MassTransit.Azure.Table.csproj b/src/Persistence/MassTransit.Azure.Table/MassTransit.Azure.Table.csproj
index 5166d6f1654..fb0be8f48b4 100644
--- a/src/Persistence/MassTransit.Azure.Table/MassTransit.Azure.Table.csproj
+++ b/src/Persistence/MassTransit.Azure.Table/MassTransit.Azure.Table.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.DapperIntegration/MassTransit.DapperIntegration.csproj b/src/Persistence/MassTransit.DapperIntegration/MassTransit.DapperIntegration.csproj
index d0aafdcdd22..9d27bd89fe9 100644
--- a/src/Persistence/MassTransit.DapperIntegration/MassTransit.DapperIntegration.csproj
+++ b/src/Persistence/MassTransit.DapperIntegration/MassTransit.DapperIntegration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.MartenIntegration/MassTransit.MartenIntegration.csproj b/src/Persistence/MassTransit.MartenIntegration/MassTransit.MartenIntegration.csproj
index e3d2abbb300..9a413cf6951 100644
--- a/src/Persistence/MassTransit.MartenIntegration/MassTransit.MartenIntegration.csproj
+++ b/src/Persistence/MassTransit.MartenIntegration/MassTransit.MartenIntegration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.MongoDbIntegration/MassTransit.MongoDbIntegration.csproj b/src/Persistence/MassTransit.MongoDbIntegration/MassTransit.MongoDbIntegration.csproj
index 651da403eb4..690fd857edb 100644
--- a/src/Persistence/MassTransit.MongoDbIntegration/MassTransit.MongoDbIntegration.csproj
+++ b/src/Persistence/MassTransit.MongoDbIntegration/MassTransit.MongoDbIntegration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.NHibernateIntegration/MassTransit.NHibernateIntegration.csproj b/src/Persistence/MassTransit.NHibernateIntegration/MassTransit.NHibernateIntegration.csproj
index c5dfb6f935f..c848bc9754e 100644
--- a/src/Persistence/MassTransit.NHibernateIntegration/MassTransit.NHibernateIntegration.csproj
+++ b/src/Persistence/MassTransit.NHibernateIntegration/MassTransit.NHibernateIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Persistence/MassTransit.RedisIntegration/MassTransit.RedisIntegration.csproj b/src/Persistence/MassTransit.RedisIntegration/MassTransit.RedisIntegration.csproj
index 81ee7a786f1..38e9f3bcf09 100644
--- a/src/Persistence/MassTransit.RedisIntegration/MassTransit.RedisIntegration.csproj
+++ b/src/Persistence/MassTransit.RedisIntegration/MassTransit.RedisIntegration.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Scheduling/MassTransit.HangfireIntegration/MassTransit.HangfireIntegration.csproj b/src/Scheduling/MassTransit.HangfireIntegration/MassTransit.HangfireIntegration.csproj
index a45084a3f99..9aef74dcfe8 100644
--- a/src/Scheduling/MassTransit.HangfireIntegration/MassTransit.HangfireIntegration.csproj
+++ b/src/Scheduling/MassTransit.HangfireIntegration/MassTransit.HangfireIntegration.csproj
@@ -2,7 +2,7 @@
   <!--  <Import Project="../signing.props" />-->
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Scheduling/MassTransit.QuartzIntegration/MassTransit.QuartzIntegration.csproj b/src/Scheduling/MassTransit.QuartzIntegration/MassTransit.QuartzIntegration.csproj
index edd9a0d83ad..0884637233d 100644
--- a/src/Scheduling/MassTransit.QuartzIntegration/MassTransit.QuartzIntegration.csproj
+++ b/src/Scheduling/MassTransit.QuartzIntegration/MassTransit.QuartzIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Transports/MassTransit.ActiveMqTransport/MassTransit.ActiveMqTransport.csproj b/src/Transports/MassTransit.ActiveMqTransport/MassTransit.ActiveMqTransport.csproj
index 57808091873..12854229693 100644
--- a/src/Transports/MassTransit.ActiveMqTransport/MassTransit.ActiveMqTransport.csproj
+++ b/src/Transports/MassTransit.ActiveMqTransport/MassTransit.ActiveMqTransport.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Transports/MassTransit.Azure.ServiceBus.Core/MassTransit.Azure.ServiceBus.Core.csproj b/src/Transports/MassTransit.Azure.ServiceBus.Core/MassTransit.Azure.ServiceBus.Core.csproj
index 13314f48a5a..7327a45f405 100644
--- a/src/Transports/MassTransit.Azure.ServiceBus.Core/MassTransit.Azure.ServiceBus.Core.csproj
+++ b/src/Transports/MassTransit.Azure.ServiceBus.Core/MassTransit.Azure.ServiceBus.Core.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Transports/MassTransit.EventHubIntegration/MassTransit.EventHubIntegration.csproj b/src/Transports/MassTransit.EventHubIntegration/MassTransit.EventHubIntegration.csproj
index e8237a5357c..17ffe0d4d1b 100644
--- a/src/Transports/MassTransit.EventHubIntegration/MassTransit.EventHubIntegration.csproj
+++ b/src/Transports/MassTransit.EventHubIntegration/MassTransit.EventHubIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <Authors>Denys Kozhevnikov, $(Authors)</Authors>
   </PropertyGroup>
 
diff --git a/src/Transports/MassTransit.KafkaIntegration/MassTransit.KafkaIntegration.csproj b/src/Transports/MassTransit.KafkaIntegration/MassTransit.KafkaIntegration.csproj
index ed94cf913a2..c3cf29f5f9b 100644
--- a/src/Transports/MassTransit.KafkaIntegration/MassTransit.KafkaIntegration.csproj
+++ b/src/Transports/MassTransit.KafkaIntegration/MassTransit.KafkaIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <Authors>Denys Kozhevnikov, $(Authors)</Authors>
   </PropertyGroup>
 
diff --git a/src/Transports/MassTransit.RabbitMqTransport/MassTransit.RabbitMqTransport.csproj b/src/Transports/MassTransit.RabbitMqTransport/MassTransit.RabbitMqTransport.csproj
index e275222a1fe..09baa6170d3 100644
--- a/src/Transports/MassTransit.RabbitMqTransport/MassTransit.RabbitMqTransport.csproj
+++ b/src/Transports/MassTransit.RabbitMqTransport/MassTransit.RabbitMqTransport.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Transports/MassTransit.SqlTransport.PostgreSql/MassTransit.SqlTransport.PostgreSql.csproj b/src/Transports/MassTransit.SqlTransport.PostgreSql/MassTransit.SqlTransport.PostgreSql.csproj
index 1fc3f846954..9517029c344 100644
--- a/src/Transports/MassTransit.SqlTransport.PostgreSql/MassTransit.SqlTransport.PostgreSql.csproj
+++ b/src/Transports/MassTransit.SqlTransport.PostgreSql/MassTransit.SqlTransport.PostgreSql.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <RootNamespace>MassTransit</RootNamespace>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/src/Transports/MassTransit.SqlTransport.SqlServer/MassTransit.SqlTransport.SqlServer.csproj b/src/Transports/MassTransit.SqlTransport.SqlServer/MassTransit.SqlTransport.SqlServer.csproj
index 2bf16b08875..00afc06427b 100644
--- a/src/Transports/MassTransit.SqlTransport.SqlServer/MassTransit.SqlTransport.SqlServer.csproj
+++ b/src/Transports/MassTransit.SqlTransport.SqlServer/MassTransit.SqlTransport.SqlServer.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
     <RootNamespace>MassTransit</RootNamespace>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/src/Transports/MassTransit.WebJobs.EventHubsIntegration/MassTransit.WebJobs.EventHubsIntegration.csproj b/src/Transports/MassTransit.WebJobs.EventHubsIntegration/MassTransit.WebJobs.EventHubsIntegration.csproj
index bbc6fba2286..06fc469c66c 100644
--- a/src/Transports/MassTransit.WebJobs.EventHubsIntegration/MassTransit.WebJobs.EventHubsIntegration.csproj
+++ b/src/Transports/MassTransit.WebJobs.EventHubsIntegration/MassTransit.WebJobs.EventHubsIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">
diff --git a/src/Transports/MassTransit.WebJobs.ServiceBusIntegration/MassTransit.WebJobs.ServiceBusIntegration.csproj b/src/Transports/MassTransit.WebJobs.ServiceBusIntegration/MassTransit.WebJobs.ServiceBusIntegration.csproj
index 499535418e5..f66f265652c 100644
--- a/src/Transports/MassTransit.WebJobs.ServiceBusIntegration/MassTransit.WebJobs.ServiceBusIntegration.csproj
+++ b/src/Transports/MassTransit.WebJobs.ServiceBusIntegration/MassTransit.WebJobs.ServiceBusIntegration.csproj
@@ -2,7 +2,7 @@
   <Import Project="../../../signing.props" />
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsWindows)' == 'true' ">