diff --git a/setup.cfg b/setup.cfg
index e8820bb..0f7c0d0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -15,6 +15,7 @@ classifiers =
     License :: OSI Approved :: BSD License
     Programming Language :: Python
     Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Topic :: Scientific/Engineering
@@ -29,7 +30,7 @@ classifiers =
 
 [options]
 packages = find:
-python_requires = >=3.8
+python_requires = >=3.7
 install_requires =
     numpy
     scikit-image
diff --git a/tox.ini b/tox.ini
index baedcf1..333ac0c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,10 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py{38,39}-{linux,macos,windows}
+envlist = py{37,38,39}-{linux,macos,windows}
 
 [gh-actions]
 python =
+    3.7: py37
     3.8: py38
     3.9: py39