diff --git a/setup.py b/setup.py
index 628c4fa..0adc213 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,6 @@ setup(
     install_requires=[
         'aiohttp',
         'PyNaCl~=1.4.0',
-        'ptvp35 @ git+https://gitea.parrrate.ru/PTV/ptvp35.git@f3429eb1ebddda9d31c0c8b6a5b780db20896ef0'
+        'ptvp35 @ git+https://gitea.parrrate.ru/PTV/ptvp35.git@4a67e2421a81efdb33fa8adf44e747cff7d75787',
     ]
 )
diff --git a/v6d0auth/cdb.py b/v6d0auth/cdb.py
index 2fb32d4..0fe83c4 100644
--- a/v6d0auth/cdb.py
+++ b/v6d0auth/cdb.py
@@ -106,6 +106,7 @@ class SignatureRequest(AbstractRequest):
         return certs.sign(bytes(self._requester))
 
     def _validate(self) -> None:
+        assert self._approved is not None
         assert certs.verify(self._approved) == bytes(self._requester)
 
     def display(self) -> str: