diff --git a/requirements.txt b/requirements.txt
index 0f411ba010ea427da8b82c5515e7cba00161b917..29e1e5bdd40f265f76dddd134579c9683b06609c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,8 +81,8 @@ pallets-sphinx-themes==1.2.3
 sphinxcontrib-plantuml==0.19
 py2puml==0.3.1
 plantuml-creator==1.0.7
+sphinxcontrib-gravizo==0.0.4
 #
-#sphinxcontrib-gravizo==0.0.4
 #plantuml-markdown==3.4.2
 #plantumlmarkdown==0.1.1
 #plantuml-wrapper==0.1.0