diff --git a/backend/requirements.txt b/backend/requirements.txt
index 6603b8d..9d105a3 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -4,6 +4,7 @@ astroquery==0.4.7
 astropy==6.0.0
 pydantic==2.5.0
 pydantic-settings==2.1.0
+email-validator==2.1.0
 python-dotenv==1.0.0
 httpx==0.25.2