diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7e1f54b..5d9a722 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -10,3 +10,4 @@ twine==3.1.1
 
 pytest==4.6.5
 pytest-runner==5.1
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability