diff --git a/requirements.txt b/requirements.txt
index 8a53d5a..290b6b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ numpy
 scipy
 matplotlib
 astropy
+PySide2
diff --git a/setup.py b/setup.py
index eb3bab2..c5f60aa 100644
--- a/setup.py
+++ b/setup.py
@@ -120,6 +120,7 @@
         "numpy",
         "scipy",
         "matplotlib",
+        "PySide2",
         "astropy",
     ],
     python_requires=">=3.6",