diff --git a/setup.cfg b/setup.cfg
index 9378fab..a70edc6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,7 @@ python_requires = >=3.9
 install_requires =
     Django >= 3.0, < 6
     django-logbasecommand < 1
-    django-notification-sender < 1
+    django-notification-sender < 2
     requests > 2, < 3
     # FIXME: remove this "feature" (dependency)? move it to optional?
     django-after-response == 0.2.2