diff --git a/setup.py b/setup.py
index bd635fb3b7..9c8773f9e3 100644
--- a/setup.py
+++ b/setup.py
@@ -73,7 +73,7 @@
       },
       include_package_data=True,
       install_requires=[
-         'numpy', 'networkx >= 2.5', 'astunparse', 'sympy<=1.9', 'pyyaml', 'ply', 'websockets', 'jinja2',
+         'numpy', 'networkx >= 2.5', 'astunparse', 'sympy >= 1.9', 'pyyaml', 'ply', 'websockets', 'jinja2',
           'fparser >= 0.1.3', 'aenum >= 3.1', 'dataclasses; python_version < "3.7"', 'dill',
           'pyreadline;platform_system=="Windows"', 'typing-compat; python_version < "3.8"'
       ] + cmake_requires,