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+# Migration Guide for the Abp Identity Server from the v3 to the v4
+
+Identity Server released the v4 version in June this year. This version brings a lot of features, enhancements and bug fixes. Unfortunately, it is also breaking changes.
+
+I saw that it released several bug patches in a short time, so we did not upgrade to v4 in the first time.
+
+We are now upgraded abp to net 5, we think it is time to upgrade Identity Server to v4.
+
+There are a lot of code changes for the abp team, but fortunately for developers, you don't need to do that, just like the changes we made in the application template.
+
+Breaking changes to the database are always tricky. In Identity Server v4 it uses `ApiScope` as an independent aggregate root. Previously it belonged to `ApiResource`. Some entities have also been changed(adding new properties, changing default values, etc.).
+
+## The following are the specific changes:
+
+`Client`:
+* Added `RequireRequestObject(bool)` and `AllowedIdentityTokenSigningAlgorithms(string)` properties.
+* Change `RequireConsent` from `true` to `false`.
+* Change `RequirePkce` from `false` to `true`.
+
+`DeviceFlowCodes`:
+* Added `SessionId(string)` and `Description(string)` properties.
+
+`PersistedGrant`:
+* Added `SessionId(string)` and `ShowInDiscoveryDocument(bool,true)` properties
+
+`ApiResource`:
+* Added `AllowedAccessTokenSigningAlgorithms(string)` and `Description(string)` and `ConsumedTime(DateTime?)` properties
+
+`ApiScope`:
+* Before it was a property of `ApiResource`, now it becomes an independent aggregate root.
+* Added `Enabled(string)` and `Description(bool,true)` properties
+
+Before we used `Dictionary<string, string>` as aggregate root's `Properties`, now we use independent classes such as `ApiResourceProperty`, `ApiScopeProperty`, `IdentityResourceProperty`.
+
+These are the changes you need to pay attention to.
+
+## How to migrate to Identity Server v4?
+
+> Please backup your database before migration!!!
+
+* If you are using EF Core, you need to add a new migration for Identity Server v4 changes.
+* Update the `IdentityServerDataSeedContributor` class in your project according to [the latest code](https://github.com/abpframework/abp/blob/dev/templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Domain/IdentityServer/IdentityServerDataSeedContributor.cs).
+
+If you have been using hard coding configuration to initialize the identity server just like we do in the application template project, a simple migration method is `clear all the tables related to the identity server in the database, and then execute the `DbMigrator` application.
+
+If you customize the `IdentityServerDataSeedContributor` or the entities mentioned above, you may need to update your code according to the actual situation. You have already understood all the changes, I think it will not be too complicated.
+
+If you have made some advanced changes to the Identity server, please check [the commit](https://github.com/abpframework/abp/commit/e118346f12b2fb146ab67f2655148916ba4a4518) for all our changes.
+
+That's all.
+
+## Related resources:
+https://leastprivilege.com/2020/06/19/announcing-identityserver4-v4-0/
+
+https://github.com/IdentityServer/IdentityServer4/issues/4592
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