diff --git a/.claude/settings.json b/.claude/settings.json
new file mode 100644
index 000000000000..671a08447779
--- /dev/null
+++ b/.claude/settings.json
@@ -0,0 +1,6 @@
+{
+  "attribution": {
+    "commit": "",
+    "pr": ""
+  }
+}
diff --git a/stubs/pyserial/serial/serialutil.pyi b/stubs/pyserial/serial/serialutil.pyi
index 3b6f84adee50..dbd5f05c3f6b 100644
--- a/stubs/pyserial/serial/serialutil.pyi
+++ b/stubs/pyserial/serial/serialutil.pyi
@@ -147,6 +147,6 @@ class SerialBase(io.RawIOBase):
     def apply_settings(self, d: dict[str, Any]) -> None: ...
     def readinto(self, buffer: WriteableBuffer, /) -> int: ...  # returns int unlike `io.RawIOBase`
     def send_break(self, duration: float = 0.25) -> None: ...
-    def read_all(self) -> bytes | None: ...
+    def read_all(self) -> bytes: ...
     def read_until(self, expected: bytes = b"\n", size: int | None = None) -> bytes: ...
     def iread_until(self, expected: bytes = ..., size: int | None = ...) -> Generator[bytes]: ...