diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index e6b40a0..31938d0 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -12,7 +12,7 @@ dependencies = [
     "pydantic-settings>=2.8.0,<3",
     "email-validator==2.2.0",
     "PyJWT>=2.10.1",
-    "bcrypt>=4.2.1,<5",
+    "bcrypt>=4.2.1,<6",
     "python-multipart>=0.0.20",
     "redis==5.2.1",
     "httpx==0.28.1",