diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index e448bf922ced7..db12b5a5b71f5 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -2,14 +2,18 @@
 /apps/admin_audit/appinfo/info.xml            @luka-nextcloud @blizzz
 /apps/cloud_federation_api/appinfo/info.xml   @mejo-
 /apps/comments/appinfo/info.xml               @edward-ly @Pytal
-/apps/contactsinteraction/appinfo/info.xml    @kesselb @miaulalala @ChristophWurst @GretaD @hamza221 @st3iny
-/apps/dashboard/appinfo/info.xml              @julien-nc @juliushaertl
-/apps/dav/lib/CalDAV                          @ChristophWurst @miaulalala @tcitworld
-/apps/dav/lib/CardDAV                         @ChristophWurst @miaulalala @tcitworld
+/apps/contactsinteraction/appinfo/info.xml    @kesselb @SebastianKrupinski
+/apps/contactsinteraction/lib                 @kesselb @SebastianKrupinski
+/apps/contactsinteraction/tests               @kesselb @SebastianKrupinski
+/apps/dashboard/appinfo/info.xml              @julien-nc @juliusknorr
+/apps/dav/lib/CalDAV                          @miaulalala @st3iny @SebastianKrupinski
+/apps/dav/lib/CardDAV                         @miaulalala @st3iny @SebastianKrupinski
+/apps/dav/tests/unit/CalDAV                   @miaulalala @st3iny @SebastianKrupinski
+/apps/dav/tests/unit/CardDAV                  @miaulalala @st3iny @SebastianKrupinski
 /apps/encryption/appinfo/info.xml             @come-nc @icewind1991
 /apps/federatedfilesharing/appinfo/info.xml   @icewind1991 @danxuliu
-/apps/federation/appinfo/info.xml             @datenangebot
-/apps/files/appinfo/info.xml                  @skjnldsv @Pytal @ArtificialOwl @come-nc @artonge @icewind1991 @szaimen @susnux @Fenn-CS
+/apps/federation/appinfo/info.xml             @nfebe
+/apps/files/appinfo/info.xml                  @skjnldsv @Pytal @ArtificialOwl @come-nc @artonge @icewind1991 @szaimen @susnux @nfebe
 /apps/files_external/appinfo/info.xml         @icewind1991 @artonge
 /apps/files_reminders/appinfo/info.xml        @Pytal
 /apps/files_sharing/appinfo/info.xml          @skjnldsv @come-nc
@@ -20,14 +24,14 @@
 /apps/settings/appinfo/info.xml               @Pytal @JuliaKirschenheuter
 /apps/sharebymail/appinfo/info.xml            @Altahrim
 /apps/systemtags/appinfo/info.xml             @Antreesy @marcelklehr
-/apps/theming/appinfo/info.xml                @skjnldsv @juliushaertl
+/apps/theming/appinfo/info.xml                @skjnldsv @juliusknorr
 /apps/twofactor_backupcodes/appinfo/info.xml  @st3iny @miaulalala @ChristophWurst
 /apps/updatenotification/appinfo/info.xml     @Pytal @JuliaKirschenheuter
 /apps/user_ldap/appinfo/info.xml              @come-nc @blizzz
 /apps/user_status/appinfo/info.xml            @Antreesy @nickvergessen
-/apps/weather_status/appinfo/info.xml         @julien-nc @juliushaertl
+/apps/weather_status/appinfo/info.xml         @julien-nc @juliusknorr
 /apps/webhook_listeners/appinfo/info.xml      @come-nc @julien-nc
-/apps/workflowengine/appinfo/info.xml         @blizzz @juliushaertl
+/apps/workflowengine/appinfo/info.xml         @blizzz @juliusknorr
 
 # Frontend expertise
 /apps/files/src*                  @skjnldsv
@@ -65,6 +69,10 @@ ResponseDefinitions.php @provokateurin
 /lib/public/Talk                    @nickvergessen
 /lib/public/UserStatus              @nickvergessen
 
+# Groupware
+/build/integration/dav_features/caldav.feature    @miaulalala @st3iny @SebastianKrupinski
+/build/integration/dav_features/carddav.feature   @miaulalala @st3iny @SebastianKrupinski
+
 # Personal interest
 */Activity/*                        @nickvergessen
 */Notifications/*                   @nickvergessen