diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py

index c6465c0386..ec0ac547c1 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -47,9 +47,9 @@ REQUIREMENTS = [
     "idna>=2.5",
     # validating SSL certs for IP addresses requires service_identity 18.1.
     "service_identity>=18.1.0",
-    # our logcontext handling relies on the ability to cancel inlineCallbacks
-    # (https://twistedmatrix.com/trac/ticket/4632) which landed in Twisted 18.7.
-    "Twisted>=18.7.0",
+    # Twisted 18.9 introduces some logger improvements that the structured
+    # logger utilises
+    "Twisted>=18.9.0",
     "treq>=15.1",
     # Twisted has required pyopenssl 16.0 since about Twisted 16.6.
     "pyopenssl>=16.0.0",