diff --git a/jwthenticator/client.py b/jwthenticator/client.py
index 35ee580..5eca0d3 100644
--- a/jwthenticator/client.py
+++ b/jwthenticator/client.py
@@ -129,7 +129,7 @@ async def authenticate(self) -> None:
         :return: None or raises exception if fails.
         """
         if self._key is None:
-            raise ValueError("Missing key")
+            raise TypeError("Missing key")
 
         url = urljoin(self.jwthenticator_server, "authenticate")
         request = schemas.AuthRequest(self._key, self.identifier)
diff --git a/pyproject.toml b/pyproject.toml
index b74da7e..7ff422f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ marshmallow = "^3.9"
 marshmallow-dataclass = "^8.3"
 pycryptodomex = "^3.9"
 environs = "^9.3.1"
-asyncpg = { version = "^0.28.0", markers = "platform_python_implementation == 'CPython'" }
+asyncpg = { version = "^0.28.0", markers = "platform_python_implementation == 'CPython'" } # pypy can not build asyncpg
 
 
 [tool.poetry.dev-dependencies]