diff --git a/grawlix/config.py b/grawlix/config.py
index 2ede0ae..c7daa36 100644
--- a/grawlix/config.py
+++ b/grawlix/config.py
@@ -1,7 +1,7 @@
 from dataclasses import dataclass
 from typing import Optional
 import tomli
-import appdirs
+from platformdirs import user_config_dir
 import os
 
 
@@ -27,7 +27,7 @@ def load_config() -> Config:
 
     :returns: Config object
     """
-    config_dir = appdirs.user_config_dir("grawlix", "jo1gi")
+    config_dir = user_config_dir("grawlix", "jo1gi")
     config_file = os.path.join(config_dir, "grawlix.toml")
     if os.path.exists(config_file):
         try:
diff --git a/pyproject.toml b/pyproject.toml
index 83ffec8..0dd718f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,21 +6,27 @@ authors = [
 description = "CLI tool for downloading ebooks"
 readme = "README.md"
 keywords = ["ebook", "cli", "downloader"]
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
 ]
 dependencies = [
-    "appdirs",
-    "beautifulsoup4",
-    "blackboxprotobuf",
-    "EbookLib",
-    "httpx",
-    "importlib-resources",
-    "lxml",
-    "pycryptodome",
-    "rich",
-    "tomli",
+    "beautifulsoup4>=4.9.0",
+    "bbpb>=1.0.0",
+    "EbookLib>=0.17",
+    "httpx>=0.23.0",
+    "importlib-resources>=5.0",
+    "lxml>=4.6.0",
+    "platformdirs>=3.0.0",
+    "pycryptodome>=3.10.0",
+    "rich>=10.0.0",
+    "tomli>=1.0.0; python_version<'3.11'",
 ]
 dynamic = ["version"]
 
diff --git a/shell.nix b/shell.nix
index 83e4454..da58cc4 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,22 +2,18 @@ with import <nixpkgs> {};
 
 let
   blackboxprotobuf = python3Packages.buildPythonPackage rec {
-    pname = "blackboxprotobuf";
-    version = "1.0.1";
+    pname = "bbpb";
+    version = "1.4.2";
 
     src = python3Packages.fetchPypi {
       inherit pname version;
-      sha256 = "sha256-IztxTmwkzp0cILhxRioiCvkXfk/sAcG3l6xauGoeHOo=";
+      sha256 = "03446991bc500cfc9dd2049e6cc9489979e157c5ecb793e27936ab3d579d3496";
     };
 
     propagatedBuildInputs = with python3Packages; [
       protobuf
     ];
 
-    patchPhase = ''
-      sed 's/protobuf==3.10.0/protobuf/' requirements.txt > requirements.txt
-    '';
-
     doCheck = false;
   };
   ebooklib = python3Packages.buildPythonPackage rec {
@@ -36,13 +32,13 @@ in
 mkShell {
   buildInputs = [
     (python3.withPackages(ps: with ps; [
-      appdirs
       beautifulsoup4
       blackboxprotobuf
       ebooklib
       httpx
       importlib-resources
       lxml
+      platformdirs
       pycryptodome
       rich
       tomli