diff --git a/requirements.txt b/requirements.txt
index 2b55f91e..13a6f59b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cython>=0.19.2
-matplotlib>=1.2
+matplotlib>=1.1
 numpy>=1.6
 scipy>=0.9
 six>=1.3