diff --git a/setup.py b/setup.py
index 0615d25a..675ca7ae 100755
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ setup(name='jedi',
               # coloroma for colored debug output
               'colorama',
               'Django<3.1',  # For now pin this.
+              'attrs',
           ],
           'qa': [
               'flake8==3.8.3',