diff --git a/requirements.txt b/requirements.txt
index e8dcf8e..48471c1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
-Django<5
+# https://docs.djangoproject.com/en/4.2/releases/4.0/#dropped-support-for-postgresql-9-6
+# https://docs.djangoproject.com/en/4.2/releases/4.2/#dropped-support-for-postgresql-11
+Django<4
 psycopg2-binary==2.9.9
 pymemcache==4.0.0
 represent-boundaries==0.10.0