diff --git a/bin/inputquneo b/bin/inputquneo
--- a/bin/inputquneo
+++ b/bin/inputquneo
@@ -26,7 +26,7 @@ curves = {
 }
 
 
-class WatchMidi(object):
+class WatchMidi:
 
     def __init__(self, graph):
         self.graph = graph
diff --git a/bin/paintserver b/bin/paintserver
--- a/bin/paintserver
+++ b/bin/paintserver
@@ -58,7 +58,7 @@ class BestMatches(PrettyErrorHandler, cy
             self.write(json.dumps({'settings': outSettings.asList()}))
 
 
-class App(object):
+class App:
 
     def __init__(self, show, session):
         self.show = show
diff --git a/light9/Effects.py b/light9/Effects.py
--- a/light9/Effects.py
+++ b/light9/Effects.py
@@ -18,7 +18,7 @@ def register(f):
 
 
 @register
-class Strip(object):
+class Strip:
     """list of r,g,b tuples for sending to an LED strip"""
     which = 'L'  # LR means both. W is the wide one
     pixels = []
diff --git a/light9/ascoltami/main.py b/light9/ascoltami/main.py
--- a/light9/ascoltami/main.py
+++ b/light9/ascoltami/main.py
@@ -22,7 +22,7 @@ from light9.ascoltami.webapp import make
 reactor = cast(IReactorCore, reactor)
 
 
-class App(object):
+class App:
 
     def __init__(self, graph, show):
         self.graph = graph
diff --git a/light9/ascoltami/musictime_client.py b/light9/ascoltami/musictime_client.py
--- a/light9/ascoltami/musictime_client.py
+++ b/light9/ascoltami/musictime_client.py
@@ -11,7 +11,7 @@ from light9 import networking
 log = logging.getLogger()
 
 
-class MusicTime(object):
+class MusicTime:
     """
     fetch times from ascoltami in a background thread; return times
     upon request, adjusted to be more precise with the system clock
diff --git a/light9/ascoltami/player.py b/light9/ascoltami/player.py
--- a/light9/ascoltami/player.py
+++ b/light9/ascoltami/player.py
@@ -11,7 +11,7 @@ log = logging.getLogger()
 
 
 
-class Player(object):
+class Player:
 
     def __init__(self, autoStopOffset=4, onEOS=None):
         """autoStopOffset is the number of seconds before the end of
diff --git a/light9/ascoltami/playlist.py b/light9/ascoltami/playlist.py
--- a/light9/ascoltami/playlist.py
+++ b/light9/ascoltami/playlist.py
@@ -7,7 +7,7 @@ class NoSuchSong(ValueError):
     after the last song in the playlist)."""
 
 
-class Playlist(object):
+class Playlist:
 
     def __init__(self, graph, playlistUri):
         self.graph = graph
diff --git a/light9/collector/collector_client.py b/light9/collector/collector_client.py
--- a/light9/collector/collector_client.py
+++ b/light9/collector/collector_client.py
@@ -11,7 +11,7 @@ log = logging.getLogger('coll_client')
 _zmqClient = None
 
 
-class TwistedZmqClient(object):
+class TwistedZmqClient:
 
     def __init__(self, service):
         zf = ZmqFactory()
diff --git a/light9/collector/device.py b/light9/collector/device.py
--- a/light9/collector/device.py
+++ b/light9/collector/device.py
@@ -10,7 +10,7 @@ from light9.newtypes import VT, DeviceCl
 log = logging.getLogger('device')
 
 
-class Device(object):
+class Device:
     pass
 
 
diff --git a/light9/collector/output.py b/light9/collector/output.py
--- a/light9/collector/output.py
+++ b/light9/collector/output.py
@@ -13,7 +13,7 @@ log = logging.getLogger('output')
 logAllDmx = logging.getLogger('output.allDmx')
 
 
-class Output(object):
+class Output:
     """
     send a binary buffer of values to some output device. Call update
     as often as you want- the result will be sent as soon as possible,
diff --git a/light9/collector/weblisteners.py b/light9/collector/weblisteners.py
--- a/light9/collector/weblisteners.py
+++ b/light9/collector/weblisteners.py
@@ -20,7 +20,7 @@ class UiListener(Protocol):
         ...
 
 
-class WebListeners(object):
+class WebListeners:
 
     def __init__(self) -> None:
         self.clients: List[Tuple[UiListener, Dict[DeviceUri, Dict[OutputAttr, OutputValue]]]] = []
diff --git a/light9/effect/effecteval.py b/light9/effect/effecteval.py
--- a/light9/effect/effecteval.py
+++ b/light9/effect/effecteval.py
@@ -64,7 +64,7 @@ def _8bit(f):
     return clamp255(int(f * 255))
 
 
-class EffectEval(object):
+class EffectEval:
     """
     runs one effect's code to turn effect attr settings into output
     device settings. No state; suitable for reload().
diff --git a/light9/effect/sequencer/note.py b/light9/effect/sequencer/note.py
--- a/light9/effect/sequencer/note.py
+++ b/light9/effect/sequencer/note.py
@@ -20,7 +20,7 @@ def pyType(n):
     return ret
 
 
-class Note(object):
+class Note:
 
     def __init__(self, graph: SyncedGraph, uri: NoteUri, effectevalModule, simpleOutputs, timed=True):
         g = self.graph = graph
diff --git a/light9/effect/sequencer/sequencer.py b/light9/effect/sequencer/sequencer.py
--- a/light9/effect/sequencer/sequencer.py
+++ b/light9/effect/sequencer/sequencer.py
@@ -32,7 +32,7 @@ class StateUpdate(All):
     pass
 
 
-class CodeWatcher(object):
+class CodeWatcher:
 
     def __init__(self, onChange):
         self.onChange = onChange
@@ -54,7 +54,7 @@ class CodeWatcher(object):
         reactor.callLater(.1, go) # type: ignore
 
 
-class Sequencer(object):
+class Sequencer:
     """Notes from the graph + current song playback -> sendToCollector"""
     def __init__(self,
                  graph: SyncedGraph,
diff --git a/light9/effect/settings.py b/light9/effect/settings.py
--- a/light9/effect/settings.py
+++ b/light9/effect/settings.py
@@ -36,7 +36,7 @@ def getVal(graph, subj):
     return ret
 
 
-class _Settings(object):
+class _Settings:
     """
     default values are 0 or '#000000'. Internal rep must not store zeros or some
     comparisons will break.
diff --git a/light9/effect/simple_outputs.py b/light9/effect/simple_outputs.py
--- a/light9/effect/simple_outputs.py
+++ b/light9/effect/simple_outputs.py
@@ -5,7 +5,7 @@ from typing import Dict, List, Tuple, An
 from rdflib import URIRef
 
 
-class SimpleOutputs(object):
+class SimpleOutputs:
     """
     Watches graph for effects that are just fading output attrs. 
     Call `values` to get (dev,attr):value settings.
diff --git a/light9/effecteval/effect.py b/light9/effecteval/effect.py
--- a/light9/effecteval/effect.py
+++ b/light9/effecteval/effect.py
@@ -15,7 +15,7 @@ class CouldNotConvert(TypeError):
     pass
 
 
-class CodeLine(object):
+class CodeLine:
     """code string is immutable"""
 
     def __init__(self, graph, code):
@@ -102,7 +102,7 @@ class CodeLine(object):
         return out
 
 
-class EffectNode(object):
+class EffectNode:
 
     def __init__(self, graph, uri):
         self.graph, self.uri = graph, uri
diff --git a/light9/effecteval/effectloop.py b/light9/effecteval/effectloop.py
--- a/light9/effecteval/effectloop.py
+++ b/light9/effecteval/effectloop.py
@@ -19,7 +19,7 @@ from light9.metrics import metrics
 log = logging.getLogger('effectloop')
 
 
-class EffectLoop(object):
+class EffectLoop:
     """maintains a collection of the current EffectNodes, gets time from
     music player, sends dmx"""
 
@@ -193,7 +193,7 @@ class EffectLoop(object):
 Z = numpy.zeros((50, 3), dtype=numpy.float16)
 
 
-class ControlBoard(object):
+class ControlBoard:
 
     def __init__(
             self,
diff --git a/light9/io/udmx.py b/light9/io/udmx.py
--- a/light9/io/udmx.py
+++ b/light9/io/udmx.py
@@ -22,7 +22,7 @@ or https://github.com/markusb/uDMX-linux
 cmd_SetChannelRange = 0x0002
 
 
-class Udmx(object):
+class Udmx:
 
     def __init__(self, bus):
         self.dev = None
diff --git a/light9/metrics.py b/light9/metrics.py
--- a/light9/metrics.py
+++ b/light9/metrics.py
@@ -101,7 +101,7 @@ class PmfStat(Stat):
 
 metrics consumer side can do this with the changing counts:
 
-class RecentFps(object):
+class RecentFps:
   def __init__(self, window=20):
     self.window = window
     self.recentTimes = []
diff --git a/light9/namespaces.py b/light9/namespaces.py
--- a/light9/namespaces.py
+++ b/light9/namespaces.py
@@ -3,7 +3,7 @@ from typing import Dict
 
 
 # Namespace was showing up in profiles
-class FastNs(object):
+class FastNs:
 
     def __init__(self, base):
         self.ns = Namespace(base)
diff --git a/light9/networking.py b/light9/networking.py
--- a/light9/networking.py
+++ b/light9/networking.py
@@ -6,7 +6,7 @@ from .showconfig import getGraph, showUr
 from .namespaces import L9
 
 
-class ServiceAddress(object):
+class ServiceAddress:
 
     def __init__(self, service):
         self.service = service
diff --git a/light9/observable.py b/light9/observable.py
--- a/light9/observable.py
+++ b/light9/observable.py
@@ -2,11 +2,11 @@ import logging
 log = logging.getLogger('observable')
 
 
-class _NoNewVal(object):
+class _NoNewVal:
     pass
 
 
-class Observable(object):
+class Observable:
     """
     like knockout's observable. Hopefully this can be replaced by a
     better python one