diff --git a/.gitignore b/.gitignore
index b694934..46e5b6d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
-.venv
\ No newline at end of file
+.venv
+__pycache__
+*.pyc
\ No newline at end of file
diff --git a/backend/app/__pycache__/serial_listener.cpython-312.pyc b/backend/app/__pycache__/serial_listener.cpython-312.pyc
index a1366b3..4ee0d07 100644
Binary files a/backend/app/__pycache__/serial_listener.cpython-312.pyc and b/backend/app/__pycache__/serial_listener.cpython-312.pyc differ
diff --git a/backend/app/serial_listener.py b/backend/app/serial_listener.py
index b3cf235..36d1c99 100644
--- a/backend/app/serial_listener.py
+++ b/backend/app/serial_listener.py
@@ -1,10 +1,62 @@
 from __future__ import annotations
 
 import logging
+import os
+import select
 import threading
+import termios
 from typing import Callable, Dict, Optional, TypedDict
 
-import serial
+
+class SerialConnectionError(Exception):
+    pass
+
+
+_BAUDRATE_TO_TERM = {
+    9600: termios.B9600,
+    19200: termios.B19200,
+    38400: termios.B38400,
+    57600: termios.B57600,
+    115200: termios.B115200,
+    230400: termios.B230400,
+}
+
+
+def _configure_port(fd: int, baudrate: int) -> None:
+    speed = _BAUDRATE_TO_TERM.get(baudrate)
+    if speed is None:
+        raise SerialConnectionError(f"Unsupported baudrate: {baudrate}")
+
+    attrs = termios.tcgetattr(fd)
+
+    attrs[0] = 0
+    attrs[1] = 0
+    attrs[2] = termios.CS8 | termios.CREAD | termios.CLOCAL
+    attrs[3] = 0
+
+    attrs[4] = speed
+    attrs[5] = speed
+
+    attrs[6][termios.VMIN] = 0
+    attrs[6][termios.VTIME] = 0
+
+    termios.tcflush(fd, termios.TCIFLUSH)
+    termios.tcsetattr(fd, termios.TCSANOW, attrs)
+
+
+def _open_serial_fd(port: str, baudrate: int) -> int:
+    try:
+        fd = os.open(port, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
+    except OSError as exc:
+        raise SerialConnectionError(f"Cannot open serial port {port}: {exc}") from exc
+
+    try:
+        _configure_port(fd, baudrate)
+    except Exception:
+        os.close(fd)
+        raise
+
+    return fd
 
 
 class TriggerLogInfo(TypedDict, total=False):
@@ -48,25 +100,40 @@ class SerialTriggerListener:
         self._logger.info("Starting serial listener on %s @ %s", port, baudrate)
         while not self._stop_event.is_set():
             try:
-                with serial.Serial(port=port, baudrate=baudrate, timeout=timeout) as serial_conn:
+                fd = _open_serial_fd(port=port, baudrate=baudrate)
+                line_buffer = bytearray()
+                try:
                     while not self._stop_event.is_set():
-                        line = serial_conn.readline().decode("utf-8", errors="ignore").strip()
-                        if not line:
+                        readable, _, _ = select.select([fd], [], [], timeout)
+                        if not readable:
                             continue
-                        trigger_info = self.on_trigger(line)
-                        if trigger_info and trigger_info.get("key") and trigger_info.get("name"):
-                            self._logger.info(
-                                "Serial trigger received: %s -> %s (%s)",
-                                line,
-                                trigger_info["key"],
-                                trigger_info["name"],
-                            )
-                        elif trigger_info and trigger_info.get("key"):
-                            self._logger.info("Serial trigger received: %s -> %s", line, trigger_info["key"])
-                        elif trigger_info and trigger_info.get("name"):
-                            self._logger.info("Serial trigger received: %s (%s)", line, trigger_info["name"])
-                        else:
-                            self._logger.info("Serial trigger received: %s", line)
-            except serial.SerialException as exc:
+                        chunk = os.read(fd, 256)
+                        if not chunk:
+                            continue
+                        line_buffer.extend(chunk)
+
+                        while b"\n" in line_buffer:
+                            raw_line, _, remainder = line_buffer.partition(b"\n")
+                            line_buffer = bytearray(remainder)
+                            line = raw_line.decode("utf-8", errors="ignore").strip()
+                            if not line:
+                                continue
+                            trigger_info = self.on_trigger(line)
+                            if trigger_info and trigger_info.get("key") and trigger_info.get("name"):
+                                self._logger.info(
+                                    "Serial trigger received: %s -> %s (%s)",
+                                    line,
+                                    trigger_info["key"],
+                                    trigger_info["name"],
+                                )
+                            elif trigger_info and trigger_info.get("key"):
+                                self._logger.info("Serial trigger received: %s -> %s", line, trigger_info["key"])
+                            elif trigger_info and trigger_info.get("name"):
+                                self._logger.info("Serial trigger received: %s (%s)", line, trigger_info["name"])
+                            else:
+                                self._logger.info("Serial trigger received: %s", line)
+                finally:
+                    os.close(fd)
+            except (OSError, SerialConnectionError) as exc:
                 self._logger.warning("Serial connection error: %s", exc)
                 self._stop_event.wait(2)
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 67e9238..c7593bc 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -1,3 +1,2 @@
-fastapi==0.116.1
-uvicorn[standard]==0.35.0
-pyserial==3.5
+fastapi==0.135.2
+uvicorn[standard]==0.42.0