diff --git a/changelog.d/5179.misc b/changelog.d/5179.misc
new file mode 100644
index 0000000000..92369cb2fc
--- /dev/null
+++ b/changelog.d/5179.misc
@@ -0,0 +1 @@
+Fix CI after new release of isort.
diff --git a/synapse/server.pyi b/synapse/server.pyi
index 3ba3a967c2..9583e82d52 100644
--- a/synapse/server.pyi
+++ b/synapse/server.pyi
@@ -18,7 +18,6 @@ import synapse.server_notices.server_notices_sender
 import synapse.state
 import synapse.storage
 
-
 class HomeServer(object):
     @property
     def config(self) -> synapse.config.homeserver.HomeServerConfig: