diff --git a/requirements.txt b/requirements.txt
index afad917..1d09bb3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,4 @@ shapely>=1.2.18
 fiona>=1.0.1
 pyproj>=1.9.3
 six>=1.3.0
-rtree
+-e git+https://github.com/Toblerity/rtree#egg=rtree