diff --git a/synapse/logging/_structured.py b/synapse/logging/_structured.py

index 7372450b45..144506c8f2 100644
--- a/synapse/logging/_structured.py
+++ b/synapse/logging/_structured.py
@@ -55,7 +55,7 @@ def stdlib_log_level_to_twisted(level: str) -> LogLevel:
 
 @attr.s
 @implementer(ILogObserver)
-class LogContextObserver(object):
+class LogContextObserver:
     """
     An ILogObserver which adds Synapse-specific log context information.
 
@@ -169,7 +169,7 @@ class OutputPipeType(Values):
 
 
 @attr.s
-class DrainConfiguration(object):
+class DrainConfiguration:
     name = attr.ib()
     type = attr.ib()
     location = attr.ib()
@@ -177,7 +177,7 @@ class DrainConfiguration(object):
 
 
 @attr.s
-class NetworkJSONTerseOptions(object):
+class NetworkJSONTerseOptions:
     maximum_buffer = attr.ib(type=int)
 
 
diff --git a/synapse/logging/_terse_json.py b/synapse/logging/_terse_json.py

index c0b9384189..1b8916cfa2 100644
--- a/synapse/logging/_terse_json.py
+++ b/synapse/logging/_terse_json.py
@@ -152,7 +152,7 @@ def TerseJSONToConsoleLogObserver(outFile: IO[str], metadata: dict) -> FileLogOb
 
 @attr.s
 @implementer(IPushProducer)
-class LogProducer(object):
+class LogProducer:
     """
     An IPushProducer that writes logs from its buffer to its transport when it
     is resumed.
@@ -190,7 +190,7 @@ class LogProducer(object):
 
 @attr.s
 @implementer(ILogObserver)
-class TerseJSONToTCPLogObserver(object):
+class TerseJSONToTCPLogObserver:
     """
     An IObserver that writes JSON logs to a TCP target.
 
diff --git a/synapse/logging/context.py b/synapse/logging/context.py

index cbeeb870cb..22598e02d2 100644
--- a/synapse/logging/context.py
+++ b/synapse/logging/context.py
@@ -74,7 +74,7 @@ except Exception:
 get_thread_id = threading.get_ident
 
 
-class ContextResourceUsage(object):
+class ContextResourceUsage:
     """Object for tracking the resources used by a log context
 
     Attributes:
@@ -179,7 +179,7 @@ class ContextResourceUsage(object):
 LoggingContextOrSentinel = Union["LoggingContext", "_Sentinel"]
 
 
-class _Sentinel(object):
+class _Sentinel:
     """Sentinel to represent the root context"""
 
     __slots__ = ["previous_context", "finished", "request", "scope", "tag"]
@@ -226,7 +226,7 @@ class _Sentinel(object):
 SENTINEL_CONTEXT = _Sentinel()
 
 
-class LoggingContext(object):
+class LoggingContext:
     """Additional context for log formatting. Contexts are scoped within a
     "with" block.
 
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py

index d39ac62168..7df0aa197d 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -185,7 +185,7 @@ if TYPE_CHECKING:
 # Helper class
 
 
-class _DummyTagNames(object):
+class _DummyTagNames:
     """wrapper of opentracings tags. We need to have them if we
     want to reference them without opentracing around. Clearly they
     should never actually show up in a trace. `set_tags` overwrites