diff --git a/actions/upgrades b/actions/upgrades
index b4d46f207..3f12ea4f7 100755
--- a/actions/upgrades
+++ b/actions/upgrades
@@ -74,6 +74,12 @@ Explanation: python3-unpaddedbase64 >= 2.1.0~
 Package: python3-unpaddedbase64
 Pin: release a=bullseye-backports
 Pin-Priority: 500
+
+Explanation: matrix-synapse >= 1.65.0-1 requires
+Explanation: python3-canonicaljson >= 1.6.2~
+Package: python3-canonicaljson
+Pin: release a=bullseye-backports
+Pin-Priority: 500
 '''
 
 DIST_UPGRADE_OBSOLETE_PACKAGES: List[str] = []
diff --git a/plinth/modules/upgrades/__init__.py b/plinth/modules/upgrades/__init__.py
index c58e2bbe3..a530f868e 100644
--- a/plinth/modules/upgrades/__init__.py
+++ b/plinth/modules/upgrades/__init__.py
@@ -60,7 +60,7 @@ class UpgradesApp(app_module.App):
 
     app_id = 'upgrades'
 
-    _version = 14
+    _version = 15
 
     can_be_disabled = False