diff --git a/.travis.yml b/.travis.yml
index 61edf5a..d86d0a8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: python
 python:
   - '2.7'
-  - '3.3'
   - '3.4'
   - '3.5'
   - '3.6'
diff --git a/README.rst b/README.rst
index 972b06b..c19c6b3 100644
--- a/README.rst
+++ b/README.rst
@@ -17,7 +17,7 @@ extracted as a stand-alone project.
 Quick facts:
 
 * Free software: BSD licensed
-* Compatible with Python 2.7 and 3.3+
+* Compatible with Python 2.7 and 3.4+
 * Latest documentation `on Read the Docs <https://cssselect.readthedocs.io/>`_
 * Source, issues and pull requests `on GitHub
   <https://github.com/scrapy/cssselect>`_
diff --git a/setup.py b/setup.py
index 032aa89..243927d 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@
     url='https://github.com/scrapy/cssselect',
     license='BSD',
     packages=['cssselect'],
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     classifiers=[
         'Development Status :: 4 - Beta',
         'Intended Audience :: Developers',
@@ -37,7 +37,6 @@
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
diff --git a/tox.ini b/tox.ini
index a019f4e..194490a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,py35,py36
+envlist = py27, py34, py35, py36
 
 [testenv]
 deps=