diff --git a/requirements.txt b/requirements.txt
index 96b593c..e1c4e8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ pyproj==1.9.4
 requests==2.5.1
 Shapely==1.5.5
 wsgiref==0.1.2
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability