diff --git a/src/setup.py b/src/setup.py
index bf253ec1f4..eb3b377284 100644
--- a/src/setup.py
+++ b/src/setup.py
@@ -194,7 +194,7 @@ setup(
         'isoweek',
         'jsonschema',
         'kombu==4.6.*',
-        'libsass==0.20.*',
+        'libsass>=0.20,<0.22',
         'lxml',
         'markdown==3.3.4',  # 3.3.5 requires importlib-metadata>=4.4, but django-bootstrap3 requires importlib-metadata<3.
         # We can upgrade markdown again once django-bootstrap3 upgrades or once we drop Python 3.6 and 3.7