diff --git a/setup.py b/setup.py
index 167e9bc..fbaa1f6 100644
--- a/setup.py
+++ b/setup.py
@@ -22,7 +22,9 @@ with open('README.md', 'r') as f:
 dependencies = [
     'mypy>=0.720,<0.730',
     'typing-extensions',
-    'django'
+    'django',
+    # depends on psycopg2 because of Postgres' ArrayField support
+    'psycopg2'
 ]
 
 setup(