diff --git a/setup.cfg b/setup.cfg
index 4d316ee..398635b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,6 +40,7 @@ install_requires =
     numpy>=1.16.3
     astropy>=3.1.2
     astroscrappy>=1.0.8
+    matplotlib>=3.1.1
     tqdm
     scikit-image>=0.15.0;python_version>='3.7'
     scikit-image==0.15.*;python_version<'3.7'