diff --git a/requirements.txt b/requirements.txt
index ef8d40c..35c515d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 pandas
 ast2json>=0.2,<0.3
-graphviz>=0.13,<0.14
\ No newline at end of file
+graphviz>=0.13,<0.14
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file