diff --git a/requirements.txt b/requirements.txt
index b36d4ff6c3..7326e58dc3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 pip>=9.0.1
 numpy>1.16
-sympy<1.6
+sympy<1.8
 scipy
 pytest>=3.6,<7.0
 pytest-runner