diff --git a/backend/requirements.txt b/backend/requirements.txt
index 3d6acf0..8b93a9d 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -4,7 +4,8 @@ sqlalchemy[asyncio]>=2.0.0
 asyncpg>=0.30.0
 pydantic-settings>=2.0.0
 python-jose[cryptography]>=3.3.0
-passlib[bcrypt]>=1.7.4
+passlib[bcrypt]
+bcrypt<5.0>=1.7.4
 redis>=5.0.0
 python-multipart>=0.0.12
 pytest>=8.0.0