diff --git a/requirements.txt b/requirements.txt
index da0632a..8dc1b2c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 bottle>=0.12.7
 python-dateutil>=2.2
 sphinx_rtd_theme
+ordereddict; python_version < '2.7'