diff --git a/dev/requirements.txt b/dev/requirements.txt
index 732d1607..dc2b5b4e 100644
--- a/dev/requirements.txt
+++ b/dev/requirements.txt
@@ -1,3 +1,4 @@
 nose
 pytest
 twine
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability