diff --git a/requirements.txt b/requirements.txt
index 7802da0b..99e7957a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,6 +4,7 @@ uvicorn==0.23.2
 python-multipart==0.0.6
 httpx==0.25.0
 pydantic==1.10.13  # Ältere Version ohne Rust-Abhängigkeit
+email-validator==2.0.0  # Required by Pydantic for email validation
 slowapi==0.1.8     # For rate limiting
 
 ## Authentication & Security