diff --git a/requirements.txt b/requirements.txt
index 654f2ce..169f932 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 py==1.4.29
 pytest==2.7.2
 requests==2.7.0
+six==1.9.0
 wheel==0.24.0
diff --git a/setup.py b/setup.py
index 14a0fd8..47ba99f 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@ setup(name='pyTelegramBotAPI',
       packages=['telebot'],
       license='GPL2',
       keywords='tools',
-      install_requires=['pytest', 'requests'],
+      install_requires=['pytest', 'requests', 'six'],
       classifiers=[
           'Development Status :: 4 - Beta',
           'Programming Language :: Python :: 2',