diff --git a/requirements-dev.txt b/requirements-dev.txt
index adab7ba..19d9e70 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,11 +2,9 @@
 --requirement requirements.txt
 
 # Testing
-pytest==4.6.9 ; python_version < '3.0'
-pytest==5.3.5 ; python_version >= '3.0'
+pytest==6.2.5
 pytest-cov==3.0.0
 coveralls==3.3.1
 
 # Documentation
-Sphinx==1.8.5 ; python_version < '3.5'
-Sphinx==3.0.4 ; python_version >= '3.5'
+Sphinx==4.3.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 5c35b4d..6242ed8 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,6 @@
 import os
 
-try:
-    from setuptools import setup
-except ImportError:
-    from distutils.core import setup
+from setuptools import setup
 
 here = os.path.abspath(os.path.dirname(__file__))
 README = open(os.path.join(here, 'README.rst')).read()