diff --git a/requirements.txt b/requirements.txt
index 1f32e3dc..6366da5c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+diff-match-patch==20121119
 dj-database-url==0.3.0
 dj-static==0.0.6
 Django==1.8.2