diff --git a/README.md b/README.md
index 75bc3a1..d0f20a3 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,10 @@ and pack all sound tracks into a single **tfrecords** file for faster reading.
 * gzip
 
 Required Python packages are listed in **requirements.txt**.
+```
+pip install --upgrade -r requirments.txt
+sudo apt install ffmpeg
+```
 
 ## Usage
 
diff --git a/lib/downloader.py b/lib/downloader.py
index c0335a9..026e271 100644
--- a/lib/downloader.py
+++ b/lib/downloader.py
@@ -16,7 +16,7 @@ def download_video(video_id, download_path, video_format="mp4", log_file=None):
     stderr = open(log_file, "a")
 
   return_code = subprocess.call(
-    ["youtube-dl", "https://youtube.com/watch?v={}".format(video_id), "--quiet", "-f",
+    ["youtube-dl", "https://youtube.com/watch?v={}".format(video_id), "--no-check-certificate", "--quiet", "-f",
      "bestvideo[ext={}]+bestaudio/best".format(video_format), "--output", download_path, "--no-continue"], stderr=stderr)
   success = return_code == 0
 
diff --git a/requirements.txt b/requirements.txt
index e69de29..b7a6166 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+youtube-dl
+gzip-reader