diff --git a/requirements/base.txt b/requirements/base.txt
index 53c2f707..668e2b1b 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -8,8 +8,9 @@ amqp==5.2.0
     # via kombu
 asgiref==3.7.2
     # via django
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
+    #   -c requirements/constraints.txt
     #   celery
     #   django
     #   kombu
diff --git a/requirements/dev.txt b/requirements/dev.txt
index befa0fcb..1d8cdeb1 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -17,8 +17,9 @@ astroid==3.1.0
     #   -r requirements/quality.txt
     #   pylint
     #   pylint-celery
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
+    #   -c requirements/constraints.txt
     #   -r requirements/test.txt
     #   celery
     #   django
diff --git a/requirements/doc.txt b/requirements/doc.txt
index eca8e5bc..01c4aa73 100644
--- a/requirements/doc.txt
+++ b/requirements/doc.txt
@@ -24,8 +24,9 @@ babel==2.14.0
     # via
     #   pydata-sphinx-theme
     #   sphinx
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
+    #   -c requirements/constraints.txt
     #   -r requirements/base.txt
     #   celery
     #   django
diff --git a/requirements/test.txt b/requirements/test.txt
index ae434ef5..cf663f9d 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -12,8 +12,9 @@ asgiref==3.7.2
     # via
     #   -r requirements/base.txt
     #   django
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
+    #   -c requirements/constraints.txt
     #   -r requirements/base.txt
     #   celery
     #   django