diff --git a/requirements.txt b/requirements.txt
index 880345e..9c503ed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ pymongo==4.1.1
 ipython==8.10.0
 pyrsistent==0.18.1
 attrs==19.3.0
+jsonpickle>=3.3.0 # not directly required, pinned by Snyk to avoid a vulnerability