diff --git a/requirements.txt b/requirements.txt
index 5142e5a0..1c3fb0ce 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ simpy==3.0.8
 six==1.6.1
 sqlalchemy==0.9.7
 sqlite3==2.6.0
-sympy==0.7.4.1
+sympy==1.9
 thrift
 turtle
 twitter