diff --git a/tools/devtools.py b/tools/devtools.py
index 114aee1..5e72d0f 100644
--- a/tools/devtools.py
+++ b/tools/devtools.py
@@ -3,7 +3,6 @@
 import platform
 import shlex
 import sys
-import typing as tp
 from collections.abc import Callable
 from pathlib import Path
 
@@ -16,18 +15,16 @@
 
 
 class Command:
-    __is_command__: bool
-
-    def __call__(self, bin_dir: Path, args: list[str]) -> None:
+    def __call__(self, bin_dir, args) -> None:
         ...
 
 
-def command(func: Callable) -> Callable:
-    tp.cast(Command, func).__is_command__ = True
+def command(func) -> Callable:
+    func.__is_command__ = True
     return func
 
 
-def run(*args: str | Path) -> None:
+def run(*args) -> None:
     cmd = " ".join(shlex.quote(str(part)) for part in args)
     print(f"Running '{cmd}'")
     ret = os.system(cmd)
@@ -36,8 +33,6 @@ def run(*args: str | Path) -> None:
 
 
 class App:
-    commands: dict[str, Command]
-
     def __init__(self):
         self.commands = {}
 
@@ -51,7 +46,7 @@ def __init__(self):
                 ), f"Expected '{name}' to have correct signature, have {inspect.signature(val)} instead of {compare}"
                 self.commands[name] = val
 
-    def __call__(self, args: list[str]) -> None:
+    def __call__(self, args) -> None:
         bin_dir = Path(sys.executable).parent
 
         if args and args[0] in self.commands:
@@ -62,27 +57,27 @@ def __call__(self, args: list[str]) -> None:
         sys.exit(f"Unknown command:\nAvailable: {sorted(self.commands)}\nWanted: {args}")
 
     @command
-    def format(self, bin_dir: Path, args: list[str]) -> None:
+    def format(self, bin_dir, args) -> None:
         if not args:
             args = [".", *args]
         run(bin_dir / "black", *args)
         run(bin_dir / "isort", *args)
 
     @command
-    def lint(self, bin_dir: Path, args: list[str]) -> None:
+    def lint(self, bin_dir, args) -> None:
         run(bin_dir / "pylama", *args)
 
     @command
-    def tests(self, bin_dir: Path, args: list[str]) -> None:
+    def tests(self, bin_dir, args) -> None:
         if "-q" not in args:
             args = ["-q", *args]
 
         env = os.environ
         env["NOSE_OF_YETI_BLACK_COMPAT"] = "false"
 
-        files: list[str] = []
+        files = []
         if "TESTS_CHDIR" in env:
-            ags: list[str] = []
+            ags = []
             test_dir = Path(env["TESTS_CHDIR"]).absolute()
             for a in args:
                 test_name = ""
@@ -108,10 +103,6 @@ def tests(self, bin_dir: Path, args: list[str]) -> None:
 
         run(bin_dir / "pytest", *files, *args)
 
-    @command
-    def tox(self, bin_dir: Path, args: list[str]) -> None:
-        run(bin_dir / "tox", *args)
-
 
 app = App()