diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1ba26e1..00f89fe 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -10,3 +10,7 @@ twine==1.10.0
 
 pytest==3.4.2
 pytest-runner==2.11.1
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability
+jinja2>=3.1.3 # 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