diff --git a/requirements-dev.txt b/requirements-dev.txt
index c19b3d26..42b82803 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,7 +6,7 @@ pytest-cov
 pylama
 codecov
 
-sphinx>=2.0.0
+sphinx>=3.3.0
 sphinx_rtd_theme
 sphinxcontrib-images
 
@@ -21,5 +21,9 @@ bandit
 importlib-metadata<5.0; python_version < '3.8'
 
 ipython>=8.10.0
-pygments>=2.7.4
+pygments>=2.15.0
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability
+idna>=3.7 # not directly required, pinned by Snyk to avoid a vulnerability
+jinja2>=3.1.3 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.31.0 # not directly required, pinned by Snyk to avoid a vulnerability