diff -ruN a/setup.py b/setup.py
--- a/setup.py	2020-04-15 15:13:07.000000000 +0100
+++ b/setup.py	2020-04-30 02:38:18.000000000 +0100
@@ -11,7 +11,7 @@
     keywords=["screen", "monitor", "desktop"],
     classifiers=[],
     install_requires=[
-        "dataclasses",
+        "dataclasses ; python_version<'3.7'",
         'Cython ; sys_platform=="darwin"',
         'pyobjus ; sys_platform=="darwin"',
     ],