diff --git a/requirements.txt b/requirements.txt
index 35da1fa..a4cc48a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 pytest==4.2.0
 pytest-asyncio==0.10.0
 pytest-mock==1.10.3
-pytest-mypy==0.3.2
+pytest-mypy==0.4.1
 pytest-flakes==4.0.0
 # because of pip bug https://github.com/pypa/pip/issues/4780
 aiohttp==3.5.4
diff --git a/src/galaxy/__init__.py b/src/galaxy/__init__.py
index 97b69ed..1453276 100644
--- a/src/galaxy/__init__.py
+++ b/src/galaxy/__init__.py
@@ -1 +1 @@
-__path__: str = __import__('pkgutil').extend_path(__path__, __name__)
+__path__: str = __import__('pkgutil').extend_path(__path__, __name__) # type: ignore
diff --git a/src/galaxy/registry_monitor.py b/src/galaxy/registry_monitor.py
index 02b1a5a..52c0fec 100644
--- a/src/galaxy/registry_monitor.py
+++ b/src/galaxy/registry_monitor.py
@@ -1,5 +1,5 @@
-import platform
-if platform.system().lower() == "windows":
+import sys
+if sys.platform == "win32":
     import logging
     import ctypes
     from ctypes.wintypes import LONG, HKEY, LPCWSTR, DWORD, BOOL, HANDLE, LPVOID