diff --git a/docs/changelog.rst b/docs/changelog.rst
index eb5e05e..78a08eb 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -3,6 +3,12 @@ Change log
 
 .. currentmodule:: picozero
 
+0.4.2 - 2023-05-12
+------------------
+
++ Bug fix relating to DigitalInputDevice bounce times
++ Updated tests after a change in micropython 1.20+
+
 0.4.1 - 2022-12-22
 ------------------
 
diff --git a/docs/conf.py b/docs/conf.py
index 3afb34a..7438ce6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -47,7 +47,7 @@ def __getattr__(cls, name):
 author = 'Raspberry Pi Foundation'
 
 # The full version, including alpha/beta/rc tags
-release = '0.4.1'
+release = '0.4.2'
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/picozero/__init__.py b/picozero/__init__.py
index 8e8fb43..794583e 100644
--- a/picozero/__init__.py
+++ b/picozero/__init__.py
@@ -1,6 +1,6 @@
 __name__ = "picozero"
 __package__ = "picozero"
-__version__ = '0.4.1'
+__version__ = '0.4.2'
 __author__ = "Raspberry Pi Foundation"
 
 from .picozero import (
diff --git a/picozero/picozero.py b/picozero/picozero.py
index 5323602..e03ed01 100644
--- a/picozero/picozero.py
+++ b/picozero/picozero.py
@@ -596,7 +596,7 @@ def LED(pin, pwm=True, active_high=True, initial_value=False):
     :param int pin:
         The pin that the device is connected to.
 
-    :param int pin:
+    :param bool pwm:
         If `pwm` is :data:`True` (the default), a :class:`PWMLED` will be
         returned. If `pwm` is :data:`False`, a :class:`DigitalLED` will be
         returned. A :class:`PWMLED` can control the brightness of the LED but
@@ -1598,7 +1598,7 @@ def _pin_change(self, p):
             while ticks_ms() < stop:
                 # keep checking, reset the stop if the value changes
                 if p.value() != last_state:
-                    stop = ticks_ms() + self._bounce_time
+                    stop = ticks_ms() + (self._bounce_time * 1000)
                     last_state = p.value()
         
         # re-enable the interupt
diff --git a/setup.py b/setup.py
index 03755d7..73f6af5 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 __project__ = 'picozero'
 __packages__ = ['picozero']
 __desc__ = 'A beginner-friendly library for using common electronics components with the Raspberry Pi Pico. '
-__version__ = '0.4.1'
+__version__ = '0.4.2'
 __author__ = "Raspberry Pi Foundation"
 __author_email__ = 'learning@raspberrypi.org'
 __license__ = 'MIT'
diff --git a/tests/test_picozero.py b/tests/test_picozero.py
index f47ee5d..d1cbcd0 100644
--- a/tests/test_picozero.py
+++ b/tests/test_picozero.py
@@ -179,8 +179,10 @@ def test_pwm_output_device_alt_values(self):
         self.assertEqual(d.freq, 200)
         
         d.off()
-        # pwm returns 1 less than the duty_factor unless the duty is set to the maximum 65535
-        self.assertEqual(d._pwm.duty_u16(), 9999)
+        # prior to micropython v1.20 PWM returned 1 less than the duty_factor
+        # unless the duty was set to the maximum 65535
+        # self.assertEqual(d._pwm.duty_u16(), 9999)
+        self.assertEqual(d._pwm.duty_u16(), 10000)
         self.assertAlmostEqual(d.value, 0, places=2) 
         
         d.on()