diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index 665a4845e3..e37930ecb9 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -12,6 +12,9 @@
 # This file contains all common constraints for edx-repos
 -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
 
+# latest version breaks the tests.
+django<2.2.21
+
 # celery 5.0 has dropped python3.5 support.
 celery<5.0