diff --git a/backend/requirements.txt b/backend/requirements.txt
index e33b63c..285f86e 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -5,3 +5,4 @@ pandas>=2.1.0
 shapely>=1.8.0,<2.0.0
 requests>=2.31.0
 networkx>=3.2.0
+pytz>=2023.3