diff --git a/.travis.yml b/.travis.yml
index bd9a8a3..f67ebbe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,6 @@
 language: python
 python:
-- '2.6'
 - '2.7'
-- '3.3'
 - '3.4'
 - '3.5'
 - '3.6'
diff --git a/doc/index.rst b/doc/index.rst
index dbdf2c6..53b1dea 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -7,7 +7,7 @@ python-json-pointer
 ===================
 
 *python-json-pointer* is a Python library for resolving JSON pointers (`RFC
-6901 <http://tools.ietf.org/html/rfc6901>`_). Python 2.6, 2.7, 3.2, 3.3
+6901 <http://tools.ietf.org/html/rfc6901>`_). Python 2.7, 3.4+
 and PyPy are supported.
 
 **Contents**
diff --git a/jsonpointer.py b/jsonpointer.py
index 285fc0c..a844729 100644
--- a/jsonpointer.py
+++ b/jsonpointer.py
@@ -174,7 +174,7 @@ def __init__(self, pointer):
         # validate escapes
         invalid_escape = self._RE_INVALID_ESCAPE.search(pointer)
         if invalid_escape:
-            raise JsonPointerException('Found invalid escape {0}'.format(
+            raise JsonPointerException('Found invalid escape {}'.format(
                 invalid_escape.group()))
 
         parts = pointer.split('/')
diff --git a/setup.py b/setup.py
index f5e850c..21660f5 100644
--- a/setup.py
+++ b/setup.py
@@ -42,10 +42,8 @@
     'Operating System :: OS Independent',
     'Programming Language :: Python',
     'Programming Language :: Python :: 2',
-    'Programming Language :: Python :: 2.6',
     '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',
@@ -66,4 +64,5 @@
       py_modules=MODULES,
       scripts=['bin/jsonpointer'],
       classifiers=CLASSIFIERS,
+      python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
 )