diff --git a/dataviz/requirements.txt b/dataviz/requirements.txt
index ac919100..df8a9020 100644
--- a/dataviz/requirements.txt
+++ b/dataviz/requirements.txt
@@ -2,3 +2,4 @@
 numpy
 matplotlib
 geojson==1.0.6
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability