diff --git a/setup.py b/setup.py
index dc0bdacb..e535195e 100644
--- a/setup.py
+++ b/setup.py
@@ -101,6 +101,7 @@
         'pyradiance',
         'scipy > 1.6.0',
         'tqdm',
+        'deprecated',
         ],
 
     # List additional groups of dependencies here (e.g. development