diff --git a/actions/upgrades b/actions/upgrades
index 2f78142ec..49069ce55 100755
--- a/actions/upgrades
+++ b/actions/upgrades
@@ -68,6 +68,12 @@ Explanation: python3-markupsafe >= 2.0
 Package: python3-markupsafe
 Pin: release a=bullseye-backports
 Pin-Priority: 500
+
+Explanation: matrix-synapse >= 1.59.1-1 requires
+Explanation: python3-unpaddedbase64 >= 2.1.0~
+Package: python3-unpaddedbase64
+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 418be5d89..646cb3833 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 = 13
+    _version = 14
 
     can_be_disabled = False