diff --git a/test/OpenIddict.Server.AspNetCore.IntegrationTests/OpenIddict.Server.AspNetCore.IntegrationTests.csproj b/test/OpenIddict.Server.AspNetCore.IntegrationTests/OpenIddict.Server.AspNetCore.IntegrationTests.csproj
index fad9494c..647b9c94 100644
--- a/test/OpenIddict.Server.AspNetCore.IntegrationTests/OpenIddict.Server.AspNetCore.IntegrationTests.csproj
+++ b/test/OpenIddict.Server.AspNetCore.IntegrationTests/OpenIddict.Server.AspNetCore.IntegrationTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.1;netcoreapp3.0;net472</TargetFrameworks>
+    <TargetFrameworks>net461;net472;netcoreapp2.1;netcoreapp3.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp3.0' ">
diff --git a/test/OpenIddict.Server.IntegrationTests/OpenIddict.Server.IntegrationTests.csproj b/test/OpenIddict.Server.IntegrationTests/OpenIddict.Server.IntegrationTests.csproj
index a265b759..b6f6edd8 100644
--- a/test/OpenIddict.Server.IntegrationTests/OpenIddict.Server.IntegrationTests.csproj
+++ b/test/OpenIddict.Server.IntegrationTests/OpenIddict.Server.IntegrationTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp2.1;netcoreapp3.0;net472</TargetFrameworks>
+    <TargetFrameworks>net461;net472;netcoreapp2.1;netcoreapp3.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/OpenIddict.Server.Owin.IntegrationTests/OpenIddict.Server.Owin.IntegrationTests.csproj b/test/OpenIddict.Server.Owin.IntegrationTests/OpenIddict.Server.Owin.IntegrationTests.csproj
index 6a478017..1594f0a9 100644
--- a/test/OpenIddict.Server.Owin.IntegrationTests/OpenIddict.Server.Owin.IntegrationTests.csproj
+++ b/test/OpenIddict.Server.Owin.IntegrationTests/OpenIddict.Server.Owin.IntegrationTests.csproj
@@ -1,7 +1,7 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net472</TargetFramework>
+    <TargetFrameworks>net461;net472</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>