diff --git a/requirements.txt b/requirements.txt
index 991646b4..39084bcb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,7 @@
-mkdocs==1.0.4
+mkdocs==1.3.0
 mkdocs-material==4.6.3
 mkdocs-minify-plugin==0.2.3
 pygments==2.6.1
 pymdown-extensions==7.0
+tornado>=6.4.1 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability