diff --git a/nc_py_api/_session.py b/nc_py_api/_session.py
index 7d53eed8..f4bc66cc 100644
--- a/nc_py_api/_session.py
+++ b/nc_py_api/_session.py
@@ -478,7 +478,6 @@ def __init__(self, **kwargs):
 
     def sign_check(self, request: HTTPConnection) -> str:
         headers = {
-            "AA-VERSION": request.headers.get("AA-VERSION", ""),
             "EX-APP-ID": request.headers.get("EX-APP-ID", ""),
             "EX-APP-VERSION": request.headers.get("EX-APP-VERSION", ""),
             "AUTHORIZATION-APP-API": request.headers.get("AUTHORIZATION-APP-API", ""),