diff --git a/doc/requirements.txt b/doc/requirements.txt
index 41a7c90f1..12cd19c1e 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,3 +1,8 @@
 sphinx==4.3.0
 sphinx_rtd_theme
+sphinxcontrib-applehelp==1.0.4
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.5
 sphinx-autodoc-typehints