diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index a17ed72f..2e3dc96e
--- a/setup.py
+++ b/setup.py
@@ -56,7 +56,7 @@ def run_tests(self):
     extras_require={
         'Duration': ['python-dateutil>=2.8.0']
     },
-    tests_require=['pytest', 'mock==3.0.5'],
+    tests_require=['pytest', 'mock==4.0.3'],
     entry_points={
         'console_scripts': [
             'pyhocon=pyhocon.tool:main'