diff --git a/requirements.txt b/requirements.txt
index c3eb320..ab5da4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -113,3 +113,4 @@ numba
 sympy>=1.12
 werkzeug>=3.0.1
 validators>=0.21.0
+orjson>=3.9.15 # not directly required, pinned by Snyk to avoid a vulnerability