diff --git a/requirements/constraints.txt b/requirements/constraints.txt
index a332cf7..2166bc8 100644
--- a/requirements/constraints.txt
+++ b/requirements/constraints.txt
@@ -16,3 +16,6 @@
 # but diff-cover latest has a pin (pluggy<1.0.0a1)
 # Using the same version of diff-cover which is being used currently in edx-platform to avoid this conflict.
 diff-cover==4.0.0
+
+# Temporary pin.
+backports-zoneinfo==0.2.1;python_version < "3.9"
\ No newline at end of file