diff --git a/setup.cfg b/setup.cfg
index 3818be5..71277bf 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,6 +33,7 @@ python_requires = >=3.7
 setup_requires = setuptools_scm
 install_requires =
     astropy
+    matplotlib
 
 [options.entry_points]
 console_scripts =