diff --git a/requirements.txt b/requirements.txt
index f46724bb..eb89f392 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ PySocks==1.6.8
 pytest==3.7.3
 redis==2.10.6
 requests==2.20.0
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability