diff --git a/setup.py b/setup.py
index 2175b4c0..f1e06d54 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@
 # Python version and OS.
 REQUIRED_PACKAGES = [
     'httplib2>=0.8',
-    'oauth2client>=1.5.2',
+    'oauth2client>=1.5.2,<4.0.0dev',
     'setuptools>=18.5',
     'six>=1.9.0',
     ]
@@ -54,7 +54,7 @@
 if py_version < '2.7':
     REQUIRED_PACKAGES.append('argparse>=1.2.1')
 
-_APITOOLS_VERSION = '0.5.4'
+_APITOOLS_VERSION = '0.5.5'
 
 with open('README.rst') as fileobj:
     README = fileobj.read()