diff --git a/setup.py b/setup.py
index 1178ae1..204e0e2 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ def readme():
 setup(
     name='demeter',
     version=version,
-    python_requires=">=3.10",
+    python_requires=">3.9",
     packages=find_packages(),
     url='https://github.com/JGCRI/demeter',
     license='BSD 2-Clause',