diff --git a/pyproject.toml b/pyproject.toml
index bd66f48..9147f6a 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,7 @@ dependencies = [
   'numpy',
   'numba',
   'typing-extensions',
+  'sympy',
 ]
 
 [project.urls]