diff --git a/src/mind_reader/network/protocol.py b/src/mind_reader/network/protocol.py
index d52d2e4..7733897 100644
--- a/src/mind_reader/network/protocol.py
+++ b/src/mind_reader/network/protocol.py
@@ -9,7 +9,7 @@ _id_generator = itertools.count(0)
 @dataclass
 class NetworkMesssage:
     event: str
-    payload: dict = field(default_factory=dict)
+    payload: dict[str, str] = field(default_factory=dict)
     id: int = field(default_factory=lambda: next(_id_generator))
     version: str = "1.0"