diff --git a/libp2p/io/abc.py b/libp2p/io/abc.py
index 8f2c7582..265663ac 100644
--- a/libp2p/io/abc.py
+++ b/libp2p/io/abc.py
@@ -14,7 +14,7 @@ class Reader(ABC):
 
 class Writer(ABC):
     @abstractmethod
-    async def write(self, data: bytes) -> int:
+    async def write(self, data: bytes) -> None:
         ...
 
 
diff --git a/libp2p/io/msgio.py b/libp2p/io/msgio.py
index 32c0d09e..82c55ac4 100644
--- a/libp2p/io/msgio.py
+++ b/libp2p/io/msgio.py
@@ -31,9 +31,8 @@ class MsgIOWriter(WriteCloser):
     def __init__(self, write_closer: WriteCloser) -> None:
         self.write_closer = write_closer
 
-    async def write(self, data: bytes) -> int:
+    async def write(self, data: bytes) -> None:
         await self.write_msg(data)
-        return len(data)
 
     async def write_msg(self, msg: bytes) -> None:
         data = encode_msg_with_length(msg)
diff --git a/libp2p/network/stream/net_stream.py b/libp2p/network/stream/net_stream.py
index 72d5c6a7..dab19204 100644
--- a/libp2p/network/stream/net_stream.py
+++ b/libp2p/network/stream/net_stream.py
@@ -51,14 +51,14 @@ class NetStream(INetStream):
         except MuxedStreamReset as error:
             raise StreamReset() from error
 
-    async def write(self, data: bytes) -> int:
+    async def write(self, data: bytes) -> None:
         """
         write to stream.
 
         :return: number of bytes written
         """
         try:
-            return await self.muxed_stream.write(data)
+            await self.muxed_stream.write(data)
         except MuxedStreamClosed as error:
             raise StreamClosed() from error
 
diff --git a/libp2p/security/noise/transport.py b/libp2p/security/noise/transport.py
index a567eb2e..51b00d0e 100644
--- a/libp2p/security/noise/transport.py
+++ b/libp2p/security/noise/transport.py
@@ -27,8 +27,8 @@ class NoiseConnection(BaseSession):
     async def read(self, n: int = None) -> bytes:
         return await self.conn.read(n)
 
-    async def write(self, data: bytes) -> int:
-        return await self.conn.write(data)
+    async def write(self, data: bytes) -> None:
+        await self.conn.write(data)
 
     async def close(self) -> None:
         await self.conn.close()
diff --git a/libp2p/security/secio/transport.py b/libp2p/security/secio/transport.py
index 9e98873b..d8216b80 100644
--- a/libp2p/security/secio/transport.py
+++ b/libp2p/security/secio/transport.py
@@ -135,9 +135,8 @@ class SecureSession(BaseSession):
             raise DecryptionFailedException() from e
         return decrypted_msg
 
-    async def write(self, data: bytes) -> int:
+    async def write(self, data: bytes) -> None:
         await self.write_msg(data)
-        return len(data)
 
     async def write_msg(self, msg: bytes) -> None:
         encrypted_data = self.local_encrypter.encrypt(msg)
diff --git a/libp2p/stream_muxer/mplex/mplex.py b/libp2p/stream_muxer/mplex/mplex.py
index 4f62e152..defe0b8d 100644
--- a/libp2p/stream_muxer/mplex/mplex.py
+++ b/libp2p/stream_muxer/mplex/mplex.py
@@ -160,7 +160,7 @@ class Mplex(IMuxedConn):
 
         return await self.write_to_stream(_bytes)
 
-    async def write_to_stream(self, _bytes: bytes) -> int:
+    async def write_to_stream(self, _bytes: bytes) -> None:
         """
         writes a byte array to a secured connection.
 
@@ -174,8 +174,6 @@ class Mplex(IMuxedConn):
                 "failed to write message to the underlying connection"
             ) from e
 
-        return len(_bytes)
-
     async def handle_incoming(self) -> None:
         """Read a message off of the secured connection and add it to the
         corresponding message buffer."""
diff --git a/libp2p/stream_muxer/mplex/mplex_stream.py b/libp2p/stream_muxer/mplex/mplex_stream.py
index 79675749..9c724cc7 100644
--- a/libp2p/stream_muxer/mplex/mplex_stream.py
+++ b/libp2p/stream_muxer/mplex/mplex_stream.py
@@ -134,7 +134,7 @@ class MplexStream(IMuxedStream):
         self._buf = self._buf[len(payload) :]
         return bytes(payload)
 
-    async def write(self, data: bytes) -> int:
+    async def write(self, data: bytes) -> None:
         """
         write to stream.
 
@@ -147,7 +147,7 @@ class MplexStream(IMuxedStream):
             if self.is_initiator
             else HeaderTags.MessageReceiver
         )
-        return await self.muxed_conn.send_message(flag, data, self.stream_id)
+        await self.muxed_conn.send_message(flag, data, self.stream_id)
 
     async def close(self) -> None:
         """Closing a stream closes it for writing and closes the remote end for