diff --git a/requirements.docs.txt b/requirements.docs.txt
index 1c85d04..2222d61 100644
--- a/requirements.docs.txt
+++ b/requirements.docs.txt
@@ -7,7 +7,7 @@ MarkupSafe==2.1.1
 mergedeep==1.3.4
 mkdocs==1.3.1
 mkdocs-autorefs==0.4.1
-mkdocs-include-markdown-plugin==3.5.2
+mkdocs-include-markdown-plugin==4.0.4
 -e git+https://github.com/rosscdh/mkdocs-markdownextradata-plugin@af90d161fd1f1157178dc6f06cafc30851da3d26#egg=mkdocs_markdownextradata_plugin
 mkdocs-material==8.3.9
 mkdocs-material-extensions==1.0.3