# Keycloak 21.0.1 released

DevFeed: [Keycloak 21.0.1 released](<https://devfeed.tech/articles/keycloak-21-0-1-released-31604.md>)

Original publisher: [Read original article](<https://www.keycloak.org/2023/03/keycloak-2101-released>)

Author: Keycloak Team

Published: 2023-03-01T00:00:00Z

Content type: release

Language: en

Sources: [Keycloak Blog](<https://devfeed.tech/sources/keycloak-blog.md>)

Topics: [Keycloak](<https://devfeed.tech/topics/keycloak.md>), [Authentication](<https://devfeed.tech/topics/authentication.md>), [migration](<https://devfeed.tech/topics/migration.md>)

Tags: [authentication](<https://devfeed.tech/tags/authentication.md>), [bugs](<https://devfeed.tech/tags/bugs.md>), [idm](<https://devfeed.tech/tags/idm.md>), [kerberos](<https://devfeed.tech/tags/kerberos.md>), [keycloak](<https://devfeed.tech/tags/keycloak.md>), [keycloak-release](<https://devfeed.tech/tags/keycloak-release.md>), [ldap](<https://devfeed.tech/tags/ldap.md>), [migration](<https://devfeed.tech/tags/migration.md>), [migration-guide](<https://devfeed.tech/tags/migration-guide.md>), [openid-connect](<https://devfeed.tech/tags/openid-connect.md>), [release](<https://devfeed.tech/tags/release.md>), [resolved](<https://devfeed.tech/tags/resolved.md>), [saml](<https://devfeed.tech/tags/saml.md>), [sso](<https://devfeed.tech/tags/sso.md>)

## AI overview

Keycloak 21.0.1 is released. The page provides download and upgrade guidance and lists resolved issues involving duplicated Set-Cookie headers, migration failures, and null-pointer exceptions during upgrades.

## Source excerpt

To download the release go to Keycloak downloads. Upgrading Before upgrading refer to the migration guide for a complete list of changes. All resolved issues Bugs #17192 Duplicated set-cookie headers sent causing issues with proxies keycloak authentication #17248 MigrateT021_0_0 fails with NPE if adminTheme is not configured explictly keycloak core #17313 When upgrading from v20.0.2 to v21.0.0 I get a NPE on Theme keycloak core