diff --git a/requirements-dev.txt b/requirements-dev.txt
index abadf71..4dc4ec9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,3 +2,6 @@ invoke==0.22.1
 wheel==0.31.1
 tox==3.6.1
 twine==1.12.1
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability
+pygments>=2.15.0 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.31.0 # not directly required, pinned by Snyk to avoid a vulnerability