diff --git a/requirements.txt b/requirements.txt
index faf34174fc2bb63d9c44706feb097f8f2b619dee..3da17371edbd4bce009bcd28962655ada72c16f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,3 @@ h5py>=2.9
 nibabel>=2.4
 numpy>=1
 scipy>=0.18
-dataclasses
diff --git a/setup.py b/setup.py
index 60c5d46c22b80ed27ad076a5e4ffe4c4b41c057e..c588d8370f8948b1d78b9f6e4d3ba8ddf487dda4 100644
--- a/setup.py
+++ b/setup.py
@@ -93,6 +93,7 @@ setup(
     author='Paul McCarthy',
     author_email='pauldmccarthy@gmail.com',
     license='Apache License Version 2.0',
+    python_requires='>=3.7',
 
     classifiers=[
         'Development Status :: 3 - Alpha',