diff --git a/README.rst b/README.rst
index a73195a..f59077d 100644
--- a/README.rst
+++ b/README.rst
@@ -45,7 +45,7 @@ Or download the source and run the setup file (requires setuptools):
 
    $ python setup.py install
 
-Xenon is tested with all versions of Python from **2.7** to **3.6** as well as
+Xenon is tested with Python versions **2.7** and **3.6** to **3.9** as well as
 **PyPy**.
 
 Usage
diff --git a/setup.py b/setup.py
index bf56fcc..1fe4249 100644
--- a/setup.py
+++ b/setup.py
@@ -40,6 +40,10 @@
           'Programming Language :: Python :: 3.3',
           'Programming Language :: Python :: 3.4',
           'Programming Language :: Python :: 3.5',
+          'Programming Language :: Python :: 3.6',
+          'Programming Language :: Python :: 3.7',
+          'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9',
           'Topic :: Software Development',
           'Topic :: Software Development :: Libraries :: Python Modules',
           'Topic :: Software Development :: Quality Assurance',