diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9f8178e9b..fd1f850da 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,13 +2,13 @@ ipykernel
 nbsphinx
 docutils
 sphinx>=6
-MarkupSafe==2.1.2
-readthedocs-sphinx-ext==2.2.0
+MarkupSafe==2.1.3
+readthedocs-sphinx-ext==2.2.3
 nbformat==5.8.0
-nbsphinx==0.9.1
+nbsphinx==0.9.3
 typing_extensions==4.5.0
-sphinx_rtd_theme==1.2.0
-nbclient==0.7.4
+sphinx_rtd_theme==2.0.0
+nbclient==0.9.0
 sphinx-design
 
 # the following list is a direct copy from requirements.txt in the root directory (requirements for NESTML itself rather than for doc building)