diff --git a/backend/app/services/virtual_printer/ftp_server.py b/backend/app/services/virtual_printer/ftp_server.py
index 168a2acaa..e5c3dad47 100644
--- a/backend/app/services/virtual_printer/ftp_server.py
+++ b/backend/app/services/virtual_printer/ftp_server.py
@@ -564,6 +564,7 @@ class VirtualPrinterFTPServer:
         self._ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
         self._ssl_context.load_cert_chain(str(self.cert_path), str(self.key_path))
         self._ssl_context.minimum_version = ssl.TLSVersion.TLSv1_2
+        self._ssl_context.maximum_version = ssl.TLSVersion.TLSv1_2
 
         # Use standard TLS settings for compatibility
         self._ssl_context.set_ciphers("HIGH:!aNULL:!MD5:!RC4")