diff --git a/setup.py b/setup.py
index 704dd51..109a023 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
         "License :: OSI Approved :: BSD License",
         "Operating System :: OS Independent",
     ],
-    python_requires=">=3.7",
+    python_requires=">=3.7, <=3.9",
     install_requires=[
         "h5py",
         "matplotlib",