diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e28d1de9..ac93e59f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,7 +43,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.426
           6.0.408
           7.0.302
 
diff --git a/Directory.Build.props b/Directory.Build.props
index 6c0581ac..9c64dd01 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -42,7 +42,6 @@
       net48
     </NetFrameworkTargetFrameworks>
     <NetCoreTargetFrameworks Condition=" '$(NetCoreTargetFrameworks)' == '' ">
-      netcoreapp3.1;
       net6.0;
       net7.0
     </NetCoreTargetFrameworks>
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 797f78f2..428f68cd 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -213,55 +213,6 @@
     <GlobalPackageReference Include="PolySharp" Condition=" '$(DisablePolySharp)' != 'true' " Version="1.13.1"          />
   </ItemGroup>
 
-  <!--
-                              ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
-                              █████ ▀██ ██ ▄▄▄█▄▄ ▄▄████ ▄▄▀██ ▄▄▄ ██ ▄▄▀██ ▄▄▄███ ▄▄ ████▀ ███
-                              █▀▀██ █ █ ██ ▄▄▄███ ██████ █████ ███ ██ ▀▀▄██ ▄▄▄█████▄▀█▀▀██ ███
-                              █▄▄██ ██▄ ██ ▀▀▀███ ██████ ▀▀▄██ ▀▀▀ ██ ██ ██ ▀▀▀███ ▀▀ █▄▄█▀ ▀██
-                              ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
-  -->
-
-  <ItemGroup Label="Package versions for .NET Core 3.1"
-    Condition=" '$(TargetFrameworkIdentifier)' == '.NETCoreApp' And $([MSBuild]::VersionEquals($(TargetFrameworkVersion), '3.1')) ">
-    <PackageVersion Include="EntityFramework"                                                 Version="6.4.4"           />
-    <PackageVersion Include="Microsoft.AspNetCore.DataProtection"                             Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational"                        Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Caching.Abstractions"                       Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Caching.Memory"                             Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions"           Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions"                       Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Http.Polly"                                 Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Logging"                                    Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Options"                                    Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.Primitives"                                 Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.WebEncoders"                                Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.IdentityModel.JsonWebTokens"                           Version="6.25.1"          />
-    <PackageVersion Include="Microsoft.IdentityModel.Protocols"                               Version="6.25.1"          />
-    <PackageVersion Include="Microsoft.IdentityModel.Tokens"                                  Version="6.25.1"          />
-    <PackageVersion Include="Microsoft.Windows.SDK.Contracts"                                 Version="10.0.17763.1000" />
-    <PackageVersion Include="MongoDB.Bson"                                                    Version="2.11.6"          />
-    <PackageVersion Include="MongoDB.Driver"                                                  Version="2.11.6"          />
-    <PackageVersion Include="NamedPipeServerStream.NetFrameworkVersion"                       Version="1.1.7"           />
-    <PackageVersion Include="Quartz.Extensions.DependencyInjection"                           Version="3.5.0"           />
-    <PackageVersion Include="System.Net.Http.Json"                                            Version="3.2.1"           />
-
-    <!--
-      Note: the following references are exclusively used in the test projects:
-    -->
-    <PackageVersion Include="AngleSharp"                                                      Version="0.14.0"          />
-    <PackageVersion Include="MartinCostello.Logging.XUnit"                                    Version="0.3.0"           />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost"                                   Version="3.1.32"          />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection"                        Version="3.1.32"          />
-    <PackageVersion Include="Moq"                                                             Version="4.18.4"          />
-    <PackageVersion Include="System.Linq.Async"                                               Version="4.1.1"           />
-
-    <!--
-      Note: OpenIddict uses PolySharp to dynamically generate polyfills for types that are not available on
-      some of the targeted TFMs (e.g Index, Range or nullable attributes on .NET Framework/.NET Standard).
-    -->
-    <GlobalPackageReference Include="PolySharp" Condition=" '$(DisablePolySharp)' != 'true' " Version="1.13.1"          />
-  </ItemGroup>
-
   <!--
                                           ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
                                           █████ ▀██ ██ ▄▄▄█▄▄ ▄▄███▀▄▄▀████ ▄▄ ██
diff --git a/README.md b/README.md
index f10e4d9d..ff77d115 100644
--- a/README.md
+++ b/README.md
@@ -32,26 +32,27 @@ can be found in the [dedicated repository](https://github.com/openiddict/openidd
 
 ## Compatibility matrix
 
-| Web framework version | .NET runtime version | OpenIddict 4.x                          |
-|-----------------------|----------------------|-----------------------------------------|
-| ASP.NET Core 2.1      | .NET Framework 4.6.1 | :heavy_check_mark: :information_source: |
-| ASP.NET Core 2.1      | .NET Framework 4.7.2 | :heavy_check_mark:                      |
-| ASP.NET Core 2.1      | .NET Framework 4.8   | :heavy_check_mark:                      |
-| ASP.NET Core 2.1      | .NET Core 2.1        | :exclamation:                           |
-|                       |                      |                                         |
-| ASP.NET Core 3.1      | .NET Core 3.1        | :heavy_check_mark:                      |
-|                       |                      |                                         |
-| ASP.NET Core 5.0      | .NET 5.0             | :exclamation:                           |
-| ASP.NET Core 6.0      | .NET 6.0             | :heavy_check_mark:                      |
-| ASP.NET Core 7.0      | .NET 7.0             | :heavy_check_mark:                      |
-|                       |                      |                                         |
-| Microsoft.Owin 4.2    | .NET Framework 4.6.1 | :heavy_check_mark: :information_source: |
-| Microsoft.Owin 4.2    | .NET Framework 4.7.2 | :heavy_check_mark:                      |
-| Microsoft.Owin 4.2    | .NET Framework 4.8   | :heavy_check_mark:                      |
+| Web framework version | .NET runtime version | OpenIddict 4.x                          | OpenIddict 5.x (preview)                |
+|-----------------------|----------------------|-----------------------------------------|-----------------------------------------|
+| ASP.NET Core 2.1      | .NET Framework 4.6.1 | :heavy_check_mark: :information_source: | :heavy_check_mark: :information_source: |
+| ASP.NET Core 2.1      | .NET Framework 4.7.2 | :heavy_check_mark:                      | :heavy_check_mark:                      |
+| ASP.NET Core 2.1      | .NET Framework 4.8   | :heavy_check_mark:                      | :heavy_check_mark:                      |
+| ASP.NET Core 2.1      | .NET Core 2.1        | :exclamation:                           | :exclamation:                           |
+|                       |                      |                                         |                                         |
+| ASP.NET Core 3.1      | .NET Core 3.1        | :heavy_check_mark:                      | :exclamation:                           |
+|                       |                      |                                         |                                         |
+| ASP.NET Core 5.0      | .NET 5.0             | :exclamation:                           | :exclamation:                           |
+| ASP.NET Core 6.0      | .NET 6.0             | :heavy_check_mark:                      | :heavy_check_mark:                      |
+| ASP.NET Core 7.0      | .NET 7.0             | :heavy_check_mark:                      | :heavy_check_mark:                      |
+|                       |                      |                                         |                                         |
+| Microsoft.Owin 4.2    | .NET Framework 4.6.1 | :heavy_check_mark: :information_source: | :heavy_check_mark: :information_source: |
+| Microsoft.Owin 4.2    | .NET Framework 4.7.2 | :heavy_check_mark:                      | :heavy_check_mark:                      |
+| Microsoft.Owin 4.2    | .NET Framework 4.8   | :heavy_check_mark:                      | :heavy_check_mark:                      |
 
 > **Warning**
-> **ASP.NET Core 2.1 on .NET Core 2.1 and ASP.NET Core 5.0 on .NET 5.0 are no longer supported by Microsoft. While OpenIddict 4.x can still be
-> used on .NET Core 2.1 thanks to its .NET Standard 2.0 compatibility, users are strongly encouraged to migrate to ASP.NET Core/.NET 6.0**.
+> **ASP.NET Core 2.1 on .NET Core 2.1, ASP.NET Core 3.1 and 5.0 are no longer supported by Microsoft. While OpenIddict can still be used
+> on these platforms thanks to its .NET Standard 2.0 compatibility, users are strongly encouraged to migrate to ASP.NET Core/.NET 6.0**.
+>
 > ASP.NET Core 2.1 on .NET Framework 4.6.1 (and higher) is still fully supported.
 
 > **Note**
diff --git a/global.json b/global.json
index 0dd10c6f..90498c12 100644
--- a/global.json
+++ b/global.json
@@ -10,7 +10,6 @@
 
     "runtimes": {
       "aspnetcore": [
-        "3.1.32",
         "6.0.16",
         "7.0.5"
       ]
diff --git a/src/OpenIddict.AspNetCore/OpenIddict.AspNetCore.csproj b/src/OpenIddict.AspNetCore/OpenIddict.AspNetCore.csproj
index 1f49ab39..90fb23d0 100644
--- a/src/OpenIddict.AspNetCore/OpenIddict.AspNetCore.csproj
+++ b/src/OpenIddict.AspNetCore/OpenIddict.AspNetCore.csproj
@@ -25,7 +25,6 @@
     <None Include="_._" Pack="true" PackagePath="lib\net461\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net472\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net48\_._" />
-    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp3.1\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net6.0\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net7.0\_._" />
   </ItemGroup>
diff --git a/src/OpenIddict/OpenIddict.csproj b/src/OpenIddict/OpenIddict.csproj
index cd24b735..0dd2628e 100644
--- a/src/OpenIddict/OpenIddict.csproj
+++ b/src/OpenIddict/OpenIddict.csproj
@@ -36,7 +36,6 @@ To use these features on ASP.NET Core or OWIN/Katana/ASP.NET 4.x, reference the
     <None Include="_._" Pack="true" PackagePath="lib\net461\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net472\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net48\_._" />
-    <None Include="_._" Pack="true" PackagePath="lib\netcoreapp3.1\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net6.0\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net6.0-windows7.0\_._" />
     <None Include="_._" Pack="true" PackagePath="lib\net6.0-windows10.0.17763\_._" />