diff --git a/setup.py b/setup.py
index 40e5428..69feee7 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@ setup(name='Mastodon.py',
       description='Python wrapper for the Mastodon API',
       packages=['mastodon'],
       setup_requires=['pytest-runner'],
-      install_requires=['requests', 'python-dateutil', 'six', 'pytz', 'decorator'],
+      install_requires=['requests', 'python-dateutil', 'six', 'pytz', 'decorator>=4.0.0'],
       tests_require=test_deps,
       extras_require=extras,
       url='https://github.com/halcy/Mastodon.py',