diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..c349571
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,14 @@
+FROM  jrottenberg/ffmpeg:4.1-ubuntu        
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    software-properties-common
+RUN add-apt-repository universe
+RUN apt-get update && apt-get install -y \
+    python3.6 \
+    python3-pip
+COPY . /app
+
+RUN pip install -r requirements.txt
+
diff --git a/README.md b/README.md
index 138bade..7f7753d 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ a CLI program to download videos in a m3u8 playlist, write it to a single video
 - Visit https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment for instructions on how to use virtualenv. 
 
 ## Usage
+
+### Setup without docker
 - clone the repository using `git clone "ssh/https url"`.
 - create a virtual environment using `virtualenv -p python3.6 venv` in linux terminal, see 'Dependencies' for platform specific instructions.
 - activate virtual environment using `source venv/bin/activate` in linux terminal, see 'Dependencies' for platform specific instructions.
@@ -26,6 +28,11 @@ a CLI program to download videos in a m3u8 playlist, write it to a single video
 - insert the url request headers in headers.txt.
 - start the script using `python -m m3u8dl <url of playlist>`.
 
+### Setup with docker
+- build docker image using `docker build -t m3u8dl:0.11 .`
+- start container `docker run -d -it --entrypoint='bash' --name m3u8dl-app m3u8dl:0.11` 
+- go into container terminal `docker exec -it m3u8dl-app bash`
+
 ## Installing/Uninstalling
 for installation and usage using pip:-
 - ensure ffmpeg is installed see dependecies section
diff --git a/m3u8dl/core/utils/write_file_no_gil.pyx b/m3u8dl/core/utils/write_file_no_gil.pyx
deleted file mode 100644
index 96aa202..0000000
--- a/m3u8dl/core/utils/write_file_no_gil.pyx
+++ /dev/null
@@ -1,23 +0,0 @@
-from libc.stdio cimport FILE, fopen, fclose, fwrite
-
-cdef extern from "stdio.h" nogil:
-    FILE *fopen(const char *, const char *);
-    int fclose(FILE *);
-    size_t fwrite(const void *, size_t size, size_t nmemb, FILE *);
-
-cdef void write_no_gil(char* f_name, char* data, int size) nogil:
-    cdef FILE* c_file
-    c_file = fopen(f_name, "ab")
-
-    fwrite(data, sizeof(data[0]), size, c_file)
-    fclose(c_file)
-
-cpdef write_file(file_path, data):
-    file_temp = file_path.encode("utf-8")
-
-    cdef int size = len(data)
-    cdef char* f_name = file_temp
-    cdef char* d = data
-
-    with nogil:
-        write_no_gil(f_name, d, size)
\ No newline at end of file
diff --git a/m3u8dl/core/weblib/fetch.py b/m3u8dl/core/weblib/fetch.py
index fd3fb2d..2f5e2d2 100644
--- a/m3u8dl/core/weblib/fetch.py
+++ b/m3u8dl/core/weblib/fetch.py
@@ -1,7 +1,6 @@
 from urllib.parse import urlparse
 from typing import Optional
 
-import write_file_no_gil
 import requests
 
 
@@ -43,10 +42,15 @@ def fetch_data(download_url: str, session: requests.Session,
             if request_data.status_code == 302:
                 request_data = redirect_handler(session, request_data)
 
+            file = open(file_path, "ab")
+
             for chunk in request_data.iter_content(10485760):
                 if not chunk:
                     break
-                write_file_no_gil.write_file(file_path, chunk)
+
+                file.write(chunk)
+            
+            file.close()
 
     except (ConnectionResetError, ConnectionRefusedError, ConnectionError,
             TimeoutError, ConnectionAbortedError, OSError):
diff --git a/requirements.txt b/requirements.txt
index bbd1267..ad25dbc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
 hyper==0.7.0
 PyInstaller==3.6
 requests==2.24.0
-Cython~=0.29.21
 progress~=1.5
\ No newline at end of file
diff --git a/setup.py b/setup.py
index aabf05e..322fbeb 100644
--- a/setup.py
+++ b/setup.py
@@ -1,17 +1,4 @@
 from setuptools import setup, find_packages, Extension
-import os
-
-USE_CYTHON = False
-
-ext = '.pyx' if USE_CYTHON else '.c'
-
-path = os.path.join("m3u8dl", "core", "utils", "write_file_no_gil")
-extensions = [Extension("write_file_no_gil", [path + ext])]
-
-if USE_CYTHON:
-    from Cython.Build import cythonize
-    extensions = cythonize(extensions)
-
 
 DESCRIPTION = 'm3u8 playlist downloader'
 VERSION = "0.1.1"
@@ -23,7 +10,6 @@
 setup(
     name="m3u8dl",
     version=VERSION,
-    ext_modules=extensions,
     zip_safe=False,
     author="Kevin Rohan Vaz",
     author_email="excalibur.krv@gmail.com",
@@ -38,7 +24,6 @@
         "hyper==0.7.0",
         "PyInstaller==3.6",
         "requests==2.24.0",
-        "Cython~=0.29.21",
         "progress~=1.5"
     ],
     classifiers=[