diff --git a/requirements.txt b/requirements.txt
index b9bac65..e69de29 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +0,0 @@
-mypy==0.720
-mypy-extensions==0.4.1
diff --git a/setup.py b/setup.py
index dcc4ac9..40c4904 100644
--- a/setup.py
+++ b/setup.py
@@ -23,6 +23,9 @@ def readme():
           'License :: OSI Approved :: MIT License',
           'Topic :: Software Development :: Libraries',
           'Programming Language :: Python :: 3',
+          'Programming Language :: Python :: 3.6',
+          'Programming Language :: Python :: 3.7',
+          'Programming Language :: Python :: 3.8',
           'Programming Language :: Python :: 3 :: Only',
           'Operating System :: OS Independent',
       ])