diff --git a/setup.py b/setup.py
index 0aafc771..9c2e89a7 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,12 @@ def get_version():
 with open('README.rst') as f:
     readme = f.read()
 
-install_requires = ['mixbox', 'lxml>=2.2.3', 'python-dateutil']
+install_requires = [
+    'lxml>=2.2.3',
+    'mixbox>=0.0.7',
+    'python-dateutil',
+]
+
 try:
     import importlib
 except ImportError:
diff --git a/tox.ini b/tox.ini
index 71ddd40c..c6a963ed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ commands =
     nosetests cybox
 deps =
     lxml==2.2.3
-    mixbox
+    mixbox>=0.0.7
     python-dateutil==1.4.1
     nose