diff --git a/requirements_dev.txt b/requirements_dev.txt
index c02036c50d..31bd87a06a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -12,3 +12,4 @@ ptvsd==4.3.2
 freezegun==0.3.12
 watchdog==0.9.0
 ptpython==3.0.17
+urllib3>=1.26.5 # not directly required, pinned by Snyk to avoid a vulnerability