diff --git a/setup.py b/setup.py
index bb52cf1d..1ef1981c 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
     'pytz',
     # install requirements depending on python version
     # see https://www.python.org/dev/peps/pep-0508/#environment-markers
-    'backports.zoneinfo; python_version <= "3.8"',
+    'backports.zoneinfo; python_version <= "3.9"',
     'tzdata'
 ]