diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index aec1c8e..3e583b8 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -24,7 +24,7 @@ dependencies = [
     "boto3>=1.34,<2.0",
     "python-decouple>=3.8,<4.0",
     "pyjwt[crypto]>=2.8,<3.0",
-    "cryptography>=42.0,<43.0",
+    "cryptography>=42.0,<51.0",
     "pgvector>=0.3,<1.0",
     "langchain>=0.2,<1.0",
     "litellm>=1.40,<2.0",