diff --git a/backend/postcode_splitter/handler/requirements.txt b/backend/postcode_splitter/handler/requirements.txt
index a718b818..6ef41b2d 100644
--- a/backend/postcode_splitter/handler/requirements.txt
+++ b/backend/postcode_splitter/handler/requirements.txt
@@ -7,4 +7,5 @@ epc-api-python==1.0.2
 boto3==1.35.44
 sqlmodel
 sqlalchemy==2.0.36
-psycopg2-binary==2.9.10
\ No newline at end of file
+psycopg2-binary==2.9.10
+pydantic-settings==2.6.0
\ No newline at end of file