diff --git a/requirements.txt b/requirements.txt
index 2024cf9..5b07e90 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==1.13.1
 thrift
 turtle
 twitter==1.19.6