diff --git a/README.rst b/README.rst
index a953a1f..1a89aec 100644
--- a/README.rst
+++ b/README.rst
@@ -1,7 +1,7 @@
 nested_lookup
 #############
 
-.. image:: https://img.shields.io/badge/pypi-0.0.2-green.svg
+.. image:: https://img.shields.io/badge/pypi-0.0.3-green.svg
   :target: https://pypi.python.org/pypi/nested-lookup
   
 .. image:: https://img.shields.io/badge/coverage-100%-green.svg
diff --git a/nested_lookup.py b/nested_lookup.py
index fd4b97a..31d21d6 100644
--- a/nested_lookup.py
+++ b/nested_lookup.py
@@ -1,3 +1,5 @@
+from six import iteritems
+
 def nested_lookup(key, document):
     """Lookup a key in a nested document, return a list of values"""
     return list(_nested_lookup(key, document))
@@ -10,7 +12,7 @@ def _nested_lookup(key, document):
                 yield result
 
     if isinstance(document, dict):
-        for k, v in document.items():
+        for k, v in iteritems(document):
             if k == key:
                 yield v
             elif isinstance(v, dict):
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..6571d6c
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+# https://pythonhosted.org/six/#six.iteritems
+six
diff --git a/setup.py b/setup.py
index 06d229a..db2cbfc 100644
--- a/setup.py
+++ b/setup.py
@@ -2,9 +2,14 @@
 
 from setuptools import setup
 
+from pip.req import parse_requirements
+
+# get list of requirement strings from requirements.txt
+requires = map(lambda ir : str(ir.req), parse_requirements('requirements.txt'))
+
 setup( 
     name = 'nested-lookup',
-    version = '0.0.2',
+    version = '0.0.3',
     description = 'lookup a key in a deeply nested document of dicts and lists',
     keywords = 'nested document dictionary dict list lookup schema json xml yaml',
     long_description = open('README.rst').read(),
@@ -18,6 +23,7 @@ setup(
 
     py_modules = ['nested_lookup'],
     include_package_data = True,
+    install_requires = requires,
 )
 
 # setup keyword args: http://peak.telecommunity.com/DevCenter/setuptools