diff --git a/.gitignore b/.gitignore
index 66c6d05..a770904 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,4 @@ __pycache__/
 result
 result/
 .env
-.idea
+.idea/
diff --git a/py_data_acq/py_data_acq/mcap_writer/writer.py b/py_data_acq/py_data_acq/mcap_writer/writer.py
index 49f8840..30099ad 100644
--- a/py_data_acq/py_data_acq/mcap_writer/writer.py
+++ b/py_data_acq/py_data_acq/mcap_writer/writer.py
@@ -30,9 +30,11 @@ def __enter__(self):
         return self
     def __exit__(self, exc_, exc_type_, tb_):
         super().finish()
+        self.writing_file.close()
     def __aenter__(self):
         return self
     async def __aexit__(self, exc_type: Any, exc_val: Any, traceback: Any):
+        self.writing_file.close()
         return super().finish()
     
     async def write_msg(self, msg):