diff --git a/scripts/setup_cell.py b/scripts/setup_cell.py
index 148527d..39510bd 100644
--- a/scripts/setup_cell.py
+++ b/scripts/setup_cell.py
@@ -100,9 +100,15 @@ def _gen_keys_python():
     """Generate WireGuard keypair using the cryptography library (no wg binary needed)."""
     import base64
     from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
+    from cryptography.hazmat.primitives.serialization import Encoding, PublicFormat, PrivateFormat, NoEncryption
     private_key = X25519PrivateKey.generate()
-    private_bytes = private_key.private_bytes_raw()
-    public_bytes = private_key.public_key().public_bytes_raw()
+    try:
+        # private_bytes_raw() available in cryptography >= 3.0
+        private_bytes = private_key.private_bytes_raw()
+        public_bytes = private_key.public_key().public_bytes_raw()
+    except AttributeError:
+        private_bytes = private_key.private_bytes(Encoding.Raw, PrivateFormat.Raw, NoEncryption())
+        public_bytes = private_key.public_key().public_bytes(Encoding.Raw, PublicFormat.Raw)
     return base64.b64encode(private_bytes).decode(), base64.b64encode(public_bytes).decode()