diff --git a/actions/upgrades b/actions/upgrades
index 9b5720c37..5f117aa9e 100755
--- a/actions/upgrades
+++ b/actions/upgrades
@@ -43,50 +43,12 @@ Pin-Priority: 500
 # upgrades app. This ensures that setup is run again and the new contents are
 # overwritten on the old file.
 APT_PREFERENCES_APPS = '''Explanation: This file is managed by FreedomBox, do not edit.
-Explanation: matrix-synapse 0.99.5 introduces room version 4. Older version
-Explanation: 0.99.2 in buster won't be able join newly created rooms.
-Package: matrix-synapse
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.2 requires python3-service-identity >= 18.1
-Package: python3-service-identity
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.5 requires python3-typing-extensions >= 3.7.4
-Package: python3-typing-extensions
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.11 requires python3-signedjson >= 1.1.0
-Package: python3-signedjson
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.12 requires python3-twisted >= 18.9.0-8~
-Package: python3-twisted
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: python3-twisted requires matching version of python3-twisted-bin
-Package: python3-twisted-bin
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.16 requires python3-attr >= 19.1.0~
-Package: python3-attr
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.19 requires python3-canonicaljson >= 1.2.0
-Package: python3-canonicaljson
-Pin: release a=buster-backports
-Pin-Priority: 500
-
-Explanation: matrix-synapse >= 1.26 recommends python3-psycopg2 >= 2.8
-Package: python3-psycopg2
-Pin: release a=buster-backports
+Explanation: matrix-synapse shall not be available in Debian stable but
+Explanation: only in backports. Upgrade priority of packages that have needed
+Explanation: versions only in backports.
+Explanation: matrix-synapse >= 1.47.0-2 requires python3-frozendict >= 1.2-3
+Package: python3-frozendict
+Pin: release a=bullseye-backports
 Pin-Priority: 500
 '''
 
diff --git a/plinth/modules/upgrades/__init__.py b/plinth/modules/upgrades/__init__.py
index 33d0e7b4d..3b2286bda 100644
--- a/plinth/modules/upgrades/__init__.py
+++ b/plinth/modules/upgrades/__init__.py
@@ -62,7 +62,7 @@ class UpgradesApp(app_module.App):
 
     app_id = 'upgrades'
 
-    _version = 9
+    _version = 10
 
     can_be_disabled = False