diff --git a/python-summary-statistics/requirements.txt b/python-summary-statistics/requirements.txt
index bf2ee678..471f0db0 100644
--- a/python-summary-statistics/requirements.txt
+++ b/python-summary-statistics/requirements.txt
@@ -2,3 +2,4 @@ numpy>=1.14.2
 pandas==0.22.0
 mip_helper==0.6.8
 tableschema
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability