diff -aur railroad-0.5.0.old/requirements-dev.txt railroad-0.5.0/requirements-dev.txt
--- railroad-0.5.0.old/requirements-dev.txt	2023-11-08 09:46:00.588903588 +0100
+++ railroad-0.5.0/requirements-dev.txt	2023-11-08 09:46:41.832874069 +0100
@@ -11,7 +11,6 @@
 pytest-cov
 tox
 coveralls
-mock
 
 # docs
 Sphinx
diff -aur railroad-0.5.0.old/test/test_actions.py railroad-0.5.0/test/test_actions.py
--- railroad-0.5.0.old/test/test_actions.py	2023-11-08 09:46:00.588903588 +0100
+++ railroad-0.5.0/test/test_actions.py	2023-11-08 09:46:22.240831785 +0100
@@ -2,7 +2,7 @@
 
 from random import randint
 
-from mock import Mock, call
+from unittest.mock import Mock, call
 from toolz import cons
 
 from railroad import actions, lift, result
diff -aur railroad-0.5.0.old/test/test_guard.py railroad-0.5.0/test/test_guard.py
--- railroad-0.5.0.old/test/test_guard.py	2023-11-08 09:46:00.588903588 +0100
+++ railroad-0.5.0/test/test_guard.py	2023-11-08 09:46:26.630544025 +0100
@@ -2,7 +2,7 @@
 
 import pytest
 
-from mock import Mock, call
+from unittest.mock import Mock, call
 
 from railroad import guard, GuardError
 
diff -aur railroad-0.5.0.old/test/test_railroad.py railroad-0.5.0/test/test_railroad.py
--- railroad-0.5.0.old/test/test_railroad.py	2023-11-08 09:46:00.588903588 +0100
+++ railroad-0.5.0/test/test_railroad.py	2023-11-08 09:46:29.687009802 +0100
@@ -3,7 +3,7 @@
 """
 import pytest
 
-from mock import Mock, call
+from unittest.mock import Mock, call
 
 from railroad import (
     prepare,
diff -aur railroad-0.5.0.old/test/test_rescue.py railroad-0.5.0/test/test_rescue.py
--- railroad-0.5.0.old/test/test_rescue.py	2023-11-08 09:46:00.588903588 +0100
+++ railroad-0.5.0/test/test_rescue.py	2023-11-08 09:46:32.103517342 +0100
@@ -2,7 +2,7 @@
 
 import pytest
 
-from mock import Mock, call
+from unittest.mock import Mock, call
 
 from railroad import rescue