diff --git a/azure-pipelines/build_nonWindows.yml b/azure-pipelines/build_nonWindows.yml
index 9a57e2f9..cf3f51d7 100644
--- a/azure-pipelines/build_nonWindows.yml
+++ b/azure-pipelines/build_nonWindows.yml
@@ -13,14 +13,6 @@ steps:
     arguments: --no-build -c $(BuildConfiguration) -f netcoreapp3.1 -v n --settings "$(Build.Repository.LocalPath)/azure-pipelines/$(Agent.OS).runsettings"
     testRunTitle: netcoreapp3.1-$(Agent.JobName)
 
-- task: DotNetCoreCLI@2
-  displayName: Run MessagePack.Tests (net5.0)
-  inputs:
-    command: test
-    projects: tests/MessagePack.Tests/MessagePack.Tests.csproj
-    arguments: --no-build -c $(BuildConfiguration) -f net5.0 -v n --settings "$(Build.Repository.LocalPath)/azure-pipelines/$(Agent.OS).runsettings"
-    testRunTitle: net5.0-$(Agent.JobName)
-
 - task: DotNetCoreCLI@2
   displayName: Run MessagePack.Tests (net6.0)
   inputs:
diff --git a/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj b/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
index d9a575d0..6804253d 100644
--- a/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
+++ b/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net472;net5.0</TargetFrameworks>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
diff --git a/sandbox/PerfNetFramework/PerfNetFramework.csproj b/sandbox/PerfNetFramework/PerfNetFramework.csproj
index 89e5cedf..57cbfd36 100644
--- a/sandbox/PerfNetFramework/PerfNetFramework.csproj
+++ b/sandbox/PerfNetFramework/PerfNetFramework.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>net472;net5.0</TargetFrameworks>
+    <TargetFrameworks>net472;net6.0</TargetFrameworks>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
diff --git a/src/MessagePack.Generator/MessagePack.Generator.csproj b/src/MessagePack.Generator/MessagePack.Generator.csproj
index be7a1027..c0a15435 100644
--- a/src/MessagePack.Generator/MessagePack.Generator.csproj
+++ b/src/MessagePack.Generator/MessagePack.Generator.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <AssemblyName>mpc</AssemblyName>
     <OutputType>Exe</OutputType>
-    <TargetFrameworks>netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp3.1;net6.0</TargetFrameworks>
     <LangVersion>10</LangVersion>
     <Nullable>enable</Nullable>
     <IsPackable>true</IsPackable>
diff --git a/src/MessagePack/MessagePack.csproj b/src/MessagePack/MessagePack.csproj
index cb24047a..801ab7de 100644
--- a/src/MessagePack/MessagePack.csproj
+++ b/src/MessagePack/MessagePack.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netcoreapp3.1;net6.0</TargetFrameworks>
     <NoWarn>$(NoWarn);CS0649</NoWarn>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <DefineConstants Condition=" '$(TargetFramework)' != 'netstandard2.0' ">$(DefineConstants);SPAN_BUILTIN</DefineConstants>
diff --git a/tests/MessagePack.Tests/MessagePack.Tests.csproj b/tests/MessagePack.Tests/MessagePack.Tests.csproj
index f6ff6860..5fb26383 100644
--- a/tests/MessagePack.Tests/MessagePack.Tests.csproj
+++ b/tests/MessagePack.Tests/MessagePack.Tests.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net472;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
+    <TargetFrameworks>net472;netcoreapp3.1;net6.0</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <LangVersion>10</LangVersion>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>