diff --git a/CircuitPython_101/basic_data_structures/song_book/debouncer.py b/CircuitPython_101/basic_data_structures/song_book/debouncer.py
index 4c07770d..d7fd84e6 100644
--- a/CircuitPython_101/basic_data_structures/song_book/debouncer.py
+++ b/CircuitPython_101/basic_data_structures/song_book/debouncer.py
@@ -28,7 +28,7 @@ Debounce an input pin.
 import time
 import digitalio
 
-class Debouncer(object):
+class Debouncer:
     """Debounce an input pin"""
 
     DEBOUNCED_STATE = 0x01
@@ -45,7 +45,7 @@ class Debouncer(object):
         self.state = 0x00
         self.pin = digitalio.DigitalInOut(pin)
         self.pin.direction = digitalio.Direction.INPUT
-        if mode != None:
+        if mode is not None:
             self.pin.pull = mode
         if self.pin.value:
             self.__set_state(Debouncer.DEBOUNCED_STATE | Debouncer.UNSTABLE_STATE)
diff --git a/EPROM_Emulator/debouncer.py b/EPROM_Emulator/debouncer.py
index c18a2905..b3f762d7 100644
--- a/EPROM_Emulator/debouncer.py
+++ b/EPROM_Emulator/debouncer.py
@@ -30,7 +30,7 @@ import time
 import digitalio
 
 
-class Debouncer(object):
+class Debouncer:
     """Debounce an input pin"""
 
     DEBOUNCED_STATE = 0x01
diff --git a/EPROM_Emulator/directory_node.py b/EPROM_Emulator/directory_node.py
index f649863a..49f7d82c 100644
--- a/EPROM_Emulator/directory_node.py
+++ b/EPROM_Emulator/directory_node.py
@@ -29,7 +29,7 @@ Manage a directory in the file system.
 import os
 
 
-class DirectoryNode(object):
+class DirectoryNode:
     """Display and navigate the SD card contents"""
 
     def __init__(self, display, parent=None, name="/"):
diff --git a/EPROM_Emulator/emulator.py b/EPROM_Emulator/emulator.py
index 056e3f75..ebd02c28 100644
--- a/EPROM_Emulator/emulator.py
+++ b/EPROM_Emulator/emulator.py
@@ -52,7 +52,7 @@ ENABLE_HOST_ACCESS = False
 DISABLE_HOST_ACCESS = True
 
 
-class Emulator(object):
+class Emulator:
     """Handle all interaction with the emulator circuit."""
 
     def __init__(self, i2c):
diff --git a/Pomodoro_Timer/debouncer.py b/Pomodoro_Timer/debouncer.py
index f9183968..6f8fcc6d 100644
--- a/Pomodoro_Timer/debouncer.py
+++ b/Pomodoro_Timer/debouncer.py
@@ -28,7 +28,7 @@ Debounce an input pin.
 import time
 import digitalio
 
-class Debouncer(object):
+class Debouncer:
     """Debounce an input pin"""
 
     DEBOUNCED_STATE = 0x01
@@ -45,7 +45,7 @@ class Debouncer(object):
         self.state = 0x00
         self.pin = digitalio.DigitalInOut(pin)
         self.pin.direction = digitalio.Direction.INPUT
-        if mode != None:
+        if mode is not None:
             self.pin.pull = mode
         if self.pin.value:
             self.__set_state(Debouncer.DEBOUNCED_STATE | Debouncer.UNSTABLE_STATE)