diff --git a/Makefile b/Makefile
index abfed74..7297136 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ clean:
 	rm -rf dist
 	rm -rf docs/_build
 	rm -rf docs/api
-	rm -rf docs/.ipynb-checkpoints
+	rm -rf docs/.ipynb_checkpoints
 	rm -rf pygrin.egg-info
 	rm -rf pygrin/__pycache__
 	rm -rf tests/__pycache__
diff --git a/pygrin/__init__.py b/pygrin/__init__.py
index c6a3cf7..6bfbb12 100644
--- a/pygrin/__init__.py
+++ b/pygrin/__init__.py
@@ -27,7 +27,7 @@
     meridional_curve(n_0, pitch, length, r_i, theta_i)
     plot_principal_planes(n_0, pitch, length, diameter)
 """
-__version__ = '0.4.4'
+__version__ = '0.5.1'
 __author__ = 'Scott Prahl'
 __email__ = 'scott.prahl@oit.edu'
 __copyright__ = '2018-23, Scott Prahl'
diff --git a/setup.cfg b/setup.cfg
index 6762941..5d62f62 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -20,9 +20,11 @@ classifiers =
 
 [options]
 packages = pygrin
-install_requires = numpy; matplotlib
-python_requires = >=3.4
+python_requires = >=3.8
 setup_requires = setuptools>=44
+install_requires = 
+    numpy
+    matplotlib
 
 [flake8]
 ignore = W503, D212, N802, N803, N806, E501
diff --git a/setup.py b/setup.py
index 9fb3cb0..5cdb3a0 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,6 @@ def get_contents(filename):
 
 setup(
     name=project,
-    python_requires=">=3.8",
     long_description=get_contents('README.rst'),
     long_description_content_type='text/x-rst',
     version=get_init_property('__version__'),