diff --git a/devrequirements.txt b/devrequirements.txt
index 98610069..7ebfe87b 100644
--- a/devrequirements.txt
+++ b/devrequirements.txt
@@ -1,4 +1,3 @@
-mock
 coverage
 coveralls
 cython
diff --git a/plyer/tests/test_battery.py b/plyer/tests/test_battery.py
index b44d504d..619a3b28 100644
--- a/plyer/tests/test_battery.py
+++ b/plyer/tests/test_battery.py
@@ -13,7 +13,7 @@
 from io import BytesIO
 from os.path import join
 from textwrap import dedent
-from mock import patch, Mock
+from unittest.mock import patch, Mock
 
 from plyer.tests.common import PlatformTest, platform_import
 
diff --git a/plyer/tests/test_cpu.py b/plyer/tests/test_cpu.py
index 8882522c..ccd22bb1 100644
--- a/plyer/tests/test_cpu.py
+++ b/plyer/tests/test_cpu.py
@@ -11,8 +11,8 @@
 import unittest
 from os import environ
 from os.path import join
-from mock import patch, Mock
 from textwrap import dedent
+from unittest.mock import patch, Mock
 
 from plyer.tests.common import PlatformTest, platform_import, splitpath
 
diff --git a/plyer/tests/test_devicename.py b/plyer/tests/test_devicename.py
index cbb0fc4b..7dac2336 100644
--- a/plyer/tests/test_devicename.py
+++ b/plyer/tests/test_devicename.py
@@ -7,10 +7,11 @@
 * Windows
 '''
 
+import socket
 import unittest
-from mock import patch
+from unittest.mock import patch
+
 from plyer.tests.common import PlatformTest, platform_import
-import socket
 
 
 class TestDeviceName(unittest.TestCase):
diff --git a/plyer/tests/test_email.py b/plyer/tests/test_email.py
index 60aa86f0..5c4c25e4 100644
--- a/plyer/tests/test_email.py
+++ b/plyer/tests/test_email.py
@@ -8,8 +8,8 @@
 '''
 
 import unittest
+from unittest.mock import Mock, patch
 
-from mock import Mock, patch
 from plyer.tests.common import PlatformTest, platform_import
 
 
diff --git a/plyer/tests/test_facade.py b/plyer/tests/test_facade.py
index b49b15f7..f264882b 100644
--- a/plyer/tests/test_facade.py
+++ b/plyer/tests/test_facade.py
@@ -16,7 +16,7 @@
 import sys
 from types import MethodType
 
-from mock import Mock, patch
+from unittest.mock import Mock, patch
 
 import plyer
 
diff --git a/plyer/tests/test_notification.py b/plyer/tests/test_notification.py
index 7177ad7a..f4c6a5a9 100644
--- a/plyer/tests/test_notification.py
+++ b/plyer/tests/test_notification.py
@@ -13,8 +13,8 @@
 
 from time import sleep
 from os.path import dirname, abspath, join
+from unittest.mock import Mock, patch
 
-from mock import Mock, patch
 from plyer.tests.common import PlatformTest, platform_import
 
 
diff --git a/plyer/tests/test_screenshot.py b/plyer/tests/test_screenshot.py
index 931fac28..94839a21 100644
--- a/plyer/tests/test_screenshot.py
+++ b/plyer/tests/test_screenshot.py
@@ -12,8 +12,8 @@
 
 from os import mkdir, remove
 from os.path import join, expanduser, exists
+from unittest.mock import patch
 
-from mock import patch
 from plyer.tests.common import PlatformTest, platform_import
 
 
diff --git a/plyer/tests/test_uniqueid.py b/plyer/tests/test_uniqueid.py
index 629c840a..befed2d6 100644
--- a/plyer/tests/test_uniqueid.py
+++ b/plyer/tests/test_uniqueid.py
@@ -8,7 +8,8 @@
 '''
 
 import unittest
-from mock import patch, Mock
+from unittest.mock import patch, Mock
+
 from plyer.tests.common import PlatformTest, platform_import
 
 
diff --git a/plyer/tests/test_utils.py b/plyer/tests/test_utils.py
index 3532b76b..9207e27b 100644
--- a/plyer/tests/test_utils.py
+++ b/plyer/tests/test_utils.py
@@ -12,7 +12,7 @@
 '''
 
 import unittest
-from mock import patch
+from unittest.mock import patch
 
 
 class TestUtils(unittest.TestCase):
diff --git a/setup.py b/setup.py
index 80f65af7..d2d17e69 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
                 'ios': ['pyobjus'],
                 'macosx': ['pyobjus'],
                 'android': ['pyjnius'],
-                'dev': ['mock', 'flake8']
+                'dev': ['flake8']
             }
         }
     )