diff --git a/flake.lock b/flake.lock
index f8c24ce..9713390 100644
--- a/flake.lock
+++ b/flake.lock
@@ -7,11 +7,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1715486357,
-        "narHash": "sha256-4pRuzsHZOW5W4CsXI9uhKtiJeQSUoe1d2M9mWU98HC4=",
+        "lastModified": 1715930644,
+        "narHash": "sha256-W9pyM3/vePxrffHtzlJI6lDS3seANQ+Nqp+i58O46LI=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "44677a1c96810a8e8c4ffaeaad10c842402647c1",
+        "rev": "e3ad5108f54177e6520535768ddbf1e6af54b59d",
         "type": "github"
       },
       "original": {
@@ -22,11 +22,11 @@
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1715148395,
-        "narHash": "sha256-lRxjTxY3103LGMjWdVqntKZHhlmMX12QUjeFrQMmGaE=",
+        "lastModified": 1716173274,
+        "narHash": "sha256-FC21Bn4m6ctajMjiUof30awPBH/7WjD0M5yqrWepZbY=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "a4e2b7909fc1bdf30c30ef21d388fde0b5cdde4a",
+        "rev": "d9e0b26202fd500cf3e79f73653cce7f7d541191",
         "type": "github"
       },
       "original": {
@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1715787315,
-        "narHash": "sha256-cYApT0NXJfqBkKcci7D9Kr4CBYZKOQKDYA23q8XNuWg=",
+        "lastModified": 1716137900,
+        "narHash": "sha256-sowPU+tLQv8GlqtVtsXioTKeaQvlMz/pefcdwg8MvfM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "33d1e753c82ffc557b4a585c77de43d4c922ebb5",
+        "rev": "6c0b7a92c30122196a761b440ac0d46d3d9954f1",
         "type": "github"
       },
       "original": {
diff --git a/overlays/isisdl.nix b/overlays/isisdl.nix
index 07658f8..183340c 100644
--- a/overlays/isisdl.nix
+++ b/overlays/isisdl.nix
@@ -1,93 +1,30 @@
-{ lib
+{ pkgs
+, lib
 , buildPythonApplication
 , fetchPypi
-, cryptography
-, requests
-, pyyaml
-, packaging
-, colorama
-, pyinotify
-, distro
-, psutil
+, python3Packages
+, withFFmpeg ? false
 }:
-let
-  remove-completion-patch = builtins.toFile "remove-completion-patch" ''
-    diff --git a/src/isisdl/utils.py b/src/isisdl/utils.py
-    index 691e18f..8597bf0 100644
-    --- a/src/isisdl/utils.py
-    +++ b/src/isisdl/utils.py
-    @@ -399,55 +399,6 @@ def startup() -> None:
-                 with open(config_file_location, "w") as f:
-                     f.write(f"# You probably want to start by copying {example_config_file_location} and adapting it.\n")
-     
-    -    if not is_windows and not is_static:
-    -        # Install completions if they don't exist already
-    -        user_dir = os.path.expanduser("~")
-    -
-    -        if shutil.which("zsh") is not None:
-    -            default_path = f"{user_dir}/.local/share/zsh/site-functions"
-    -            whitelist_paths = [
-    -                f"{user_dir}/.oh-my-zsh/completions",
-    -                f"{user_dir}/.oh-my-zsh/custom/plugins/zsh-completions/src",
-    -            ]
-    -
-    -            # Since the session is interactive it might contain stuff like neofetch etc.
-    -            rand_string = "".join(random.choice(string.ascii_letters) for _ in range(32))
-    -            fpath = subprocess.check_output(["zsh", "-c", "-i", f"echo {rand_string}; echo $FPATH"]) \
-    -                .decode().split(rand_string)[-1].strip().split(":")
-    -
-    -            # 1. Find install path (default .local/share/zsh/site-functions or .local/share/isisdl/)
-    -            # 2. copy _isisdl there
-    -
-    -            # 3. Export this path to $FPATH via .zshrc (make this transparent to user)
-    -            # 4. autoload [path]/_isisdl
-    -
-    -            for final_path in whitelist_paths:
-    -                for p in fpath:
-    -                    if final_path == p and not (os.path.exists(final_path) and not os.access(final_path, os.W_OK | os.X_OK)):
-    -                        break
-    -
-    -            else:
-    -                final_path = default_path
-    -
-    -            # Here the file is always copied to the destination dir.
-    -            # This is fine since the Filesystem will (hopefully) realize that the files are the same and thus ignore it.
-    -            os.makedirs(final_path, exist_ok=True)
-    -
-    -            completion_source = source_code_location.joinpath("resources", "completions", "zsh", "_isisdl")
-    -            if completion_source.exists():
-    -                shutil.copy(completion_source, final_path)
-    -
-    -            # TODO: Also tag this file as autoloadable
-    -
-    -        if shutil.which("fish") is not None:
-    -            # TODO
-    -            pass
-    -
-    -        if shutil.which("bash") is not None:
-    -            final_path = f"{user_dir}/.local/share/bash-completion/completions"
-    -            os.makedirs(final_path, exist_ok=True)
-    -            shutil.copy(source_code_location.joinpath("resources", "completions", "zsh", "_isisdl"), final_path)
-    -
-     
-     def clear() -> None:
-         if is_windows:
-  '';
-in
 buildPythonApplication rec {
   pname = "isisdl";
-  version = "1.3.19";
+  version = "1.3.20";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-VcqaFqcoH+d1NpKq7QBVbXcbe0HfZ67kStGFiYmr/kE=";
+    hash = "sha256-s0vGCJVSa6hf6/sIhzmaxpziP4izoRwcZfxvm//5inY=";
   };
 
-  patches = [
-    remove-completion-patch
+  pyproject = true;
+
+    build-system = with python3Packages; [
+    setuptools
   ];
 
-  propagatedBuildInputs = [
+  nativeBuildInputs = with python3Packages; [
+    pythonRelaxDepsHook
+  ];
+
+  dependencies = with python3Packages; [
     cryptography
     requests
     pyyaml
@@ -98,11 +35,32 @@ buildPythonApplication rec {
     psutil
   ];
 
+  pythonRelaxDeps = [
+    "cryptography"
+    "requests"
+    "packaging"
+    "distro"
+  ];
+
+  buildInputs = [
+    pkgs.util-linux # for runtime dependency `lsblk`
+  ] ++ lib.optionals withFFmpeg [
+    pkgs.ffmpeg
+  ];
+
+  # disable tests since they require valid login credentials
   doCheck = false;
 
   meta = with lib; {
     homepage = "https://github.com/Emily3403/isisdl";
     description = "A downloader for ISIS of TU-Berlin";
-    license = licenses.mit;
+    longDescription = ''
+      A downloading utility for ISIS of TU-Berlin.
+      Download all your files and videos from ISIS.
+    '';
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ bchmnn ];
+    mainProgram = "isisdl";
+    platforms = platforms.linux;
   };
 }