diff --git a/deploy_requirements.txt b/deploy_requirements.txt
index 8c2e6ceb..1ab142c1 100644
--- a/deploy_requirements.txt
+++ b/deploy_requirements.txt
@@ -1,16 +1,17 @@
 alabaster==0.7.12
 Babel==2.9.1
 docutils==0.17.1
-gevent==21.1.2
+gevent==23.9.0
 greenlet==1.1.0
 gunicorn==19.8.1
 imagesize==1.2.0
 packaging==20.9
-Pygments==2.5.2
+Pygments==2.15.0
 pyparsing==2.4.7
 snowballstemmer==2.1.0
-Sphinx==1.8.5
+Sphinx==3.3.0
 sphinxcontrib-websupport==1.1.2
 typing==3.10.0.0
 zope.event==4.5.0
 zope.interface==5.4.0
+certifi>=2023.7.22 # not directly required, pinned by Snyk to avoid a vulnerability