diff --git a/kuna/__init__.py b/kuna/__init__.py
index cb6419e..e02e9ed 100644
--- a/kuna/__init__.py
+++ b/kuna/__init__.py
@@ -1,8 +1,9 @@
 # -*- coding: utf-8 -*-
-from .kuna import KunaAPI, APIError
 
 """Top-level package for Kuna API wrapper."""
 
 __author__ = """Dmytro Litvinov"""
 __email__ = "me@dmytrolitvinov.com"
 __version__ = "0.4.1"
+
+from .kuna import KunaAPI, APIError  # noqa: F401
diff --git a/setup.py b/setup.py
index fc540e2..ad765b8 100644
--- a/setup.py
+++ b/setup.py
@@ -38,6 +38,7 @@
     license="MIT license",
     zip_safe=False,
     keywords="kuna",
+    python_requires=">=3.6",
     classifiers=[
         "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",