diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index f61a3260..fcbfa391 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -13,3 +13,5 @@
 -c https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt
 
 celery<6.0
+
+backports.zoneinfo;python_version<"3.9"