diff --git a/setup.py b/setup.py
index b1cb610..c2685c0 100644
--- a/setup.py
+++ b/setup.py
@@ -106,7 +106,7 @@ def get_git_commit_datetime() -> str:
     'pytest-sugar>=0.9.2,<0.10',
     'pytest-timeout>=1.3.3,<1.4',
     'pytest>=5.1.2,<6',
-    'requests_mock==1.6.0',
+    'requests_mock>=1.6.0,<2',
     'wheel==0.33.1',  # Otherwise setup.py bdist_wheel does not work
     'codecov==2.0.15',
     'twine==1.13.0',