diff --git a/requirements.txt b/requirements.txt
index eae21b5..1d2f5af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,5 +13,5 @@ pysb>=1.11
 pytest>=6.2
 scikit-learn>=0.24
 scipy>=1.5
-sympy==1.5
+sympy==1.13.3
 tqdm>=4.56
\ No newline at end of file