diff --git a/setup.py b/setup.py
index 11c3e7d..5169526 100644
--- a/setup.py
+++ b/setup.py
@@ -47,6 +47,7 @@ extras_require['all'] = sum((lst for lst in extras_require.values()), [])
 
 install_requires = [
     'pynacl==1.1.2',
+    'simplejson==3.10.0',
     'secret-handshake'
 ]