diff --git a/pssecret_server/utils.py b/pssecret_server/utils.py
index b1ae479..239ff37 100644
--- a/pssecret_server/utils.py
+++ b/pssecret_server/utils.py
@@ -7,8 +7,8 @@ from pssecret_server.models import Secret
 
 
 def encrypt_secret(data: Secret, fernet: Fernet) -> Secret:
-    data.data = fernet.encrypt(data.data.encode()).decode()
-    return data
+    encrypted = fernet.encrypt(data.data.encode()).decode()
+    return Secret(data=encrypted)
 
 
 def decrypt_secret(secret: bytes, fernet: Fernet) -> bytes: