diff --git a/docs/requirements.txt b/docs/requirements.txt
index 569638391e..2bfb42c832 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
+mkdocs==1.4.3
 mkdocs-macros-plugin>=0.7,<1.0
 mkdocs-material>=9.0,<10.0
 mkdocs-git-revision-date-localized-plugin>=1.1,<2.0