diff --git a/requirements.txt b/requirements.txt
index 3601f90..d0a1b24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,6 @@ pandas
 python-catmaid
 jsonpath-rw
 pyyaml
+certifi>=2022.12.7 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+ujson>=5.4.0 # not directly required, pinned by Snyk to avoid a vulnerability