diff --git a/docs/source/usersguide/install.rst b/docs/source/usersguide/install.rst
index 695240406..5fc1fe639 100644
--- a/docs/source/usersguide/install.rst
+++ b/docs/source/usersguide/install.rst
@@ -484,7 +484,7 @@ to install the Python package in :ref:`"editable" mode <devguide_editable>`.
 Prerequisites
 -------------
 
-The Python API works with Python 3.5+. In addition to Python itself, the API
+The Python API works with Python 3.6+. In addition to Python itself, the API
 relies on a number of third-party packages. All prerequisites can be installed
 using Conda_ (recommended), pip_, or through the package manager in most Linux
 distributions.
diff --git a/setup.py b/setup.py
index 6afac4df1..ecc046109 100755
--- a/setup.py
+++ b/setup.py
@@ -57,14 +57,14 @@ kwargs = {
         'Topic :: Scientific/Engineering'
         'Programming Language :: C++',
         'Programming Language :: Python :: 3',
-        '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',
     ],
 
     # Dependencies
-    'python_requires': '>=3.5',
+    'python_requires': '>=3.6',
     'install_requires': [
         'numpy>=1.9', 'h5py', 'scipy', 'ipython', 'matplotlib',
         'pandas', 'lxml', 'uncertainties'