diff --git a/setup.py b/setup.py
index 060ce00..f4e3ecd 100644
--- a/setup.py
+++ b/setup.py
@@ -15,6 +15,11 @@ if sys.argv[-1] == "publish":
 	publish()
 	sys.exit()
 
+required = []
+
+if sys.version_info < (2, 6):
+	required.append('simplejson')
+
 setup(
 	name='tablib',
 	version='0.8.4',
@@ -24,8 +29,8 @@ setup(
 	author='Kenneth Reitz',
 	author_email='me@kennethreitz.com',
 	url='http://github.com/kennethreitz/tablib',
-	packages=['tablib', 'tablib.formats'],
-	install_requires=['xlwt', 'simplejson', 'PyYAML'],
+	packages=['tablib', 'tablib.formats', 'tablib.packages.yaml', 'tablib.packages.xlwt'],
+	install_requires=required,
 	license='MIT',
 	classifiers=(
 		'Development Status :: 5 - Production/Stable',
diff --git a/tablib/formats/_json.py b/tablib/formats/_json.py
index 843da90..5619316 100644
--- a/tablib/formats/_json.py
+++ b/tablib/formats/_json.py
@@ -4,9 +4,9 @@
 """
 
 try:
-  import json
+	import json
 except ImportError:
-  import simplejson as json
+	import simplejson as json
 
 import tablib.core
 
diff --git a/tablib/formats/_xls.py b/tablib/formats/_xls.py
index f7be4a4..97a9580 100644
--- a/tablib/formats/_xls.py
+++ b/tablib/formats/_xls.py
@@ -3,9 +3,13 @@
 """ Tablib - XLS Support.
 """
 
-import xlwt
 import cStringIO
 
+try:
+	import xlwt
+except ImportError:
+	import tablib.packages.xlwt as xlwt
+
 
 title = 'xls'
 extentions = ('xls',)
diff --git a/tablib/formats/_yaml.py b/tablib/formats/_yaml.py
index ab96b61..59d49a0 100644
--- a/tablib/formats/_yaml.py
+++ b/tablib/formats/_yaml.py
@@ -4,9 +4,9 @@
 """
 
 try:
-  import yaml
+	import yaml
 except ImportError:
-  import tablib.packages.yaml as yaml
+	import tablib.packages.yaml as yaml
 
 import tablib