diff --git a/dev-requirements.txt b/dev-requirements.txt
index 4666d8ff..25919df2 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -15,3 +15,5 @@ pytest-mock==3.3.0
 pytest-cov==2.12.1
 -e git+https://github.com/codecov/codecov-python.git@4ec70db255cc2dc332fbd01aab3069d9b2e699dc#egg=codecov
 jinja2<3.1.0
+tornado>=6.4.2 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability