diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 8f53c28d..09846c94 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -56,7 +56,7 @@ jobs:
 
       - name: Install dependency
         run: |
-          pip install -U cryptography PyNaCl pytest pytest-cov mock coveralls
+          pip install -U cryptography PyNaCl pytest pytest-cov coveralls
 
       - name: Set up MySQL
         run: |
diff --git a/pymysql/tests/test_connection.py b/pymysql/tests/test_connection.py
index be4006f6..75db73cd 100644
--- a/pymysql/tests/test_connection.py
+++ b/pymysql/tests/test_connection.py
@@ -1,9 +1,10 @@
 import datetime
 import ssl
 import sys
-import time
-import mock
 import pytest
+import time
+from unittest import mock
+
 import pymysql
 from pymysql.tests import base
 from pymysql.constants import CLIENT
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 69d3f68a..d65512fb 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,3 @@
 cryptography
 PyNaCl>=1.4.0
 pytest
-mock