diff --git a/doc/requirements.txt b/doc/requirements.txt
index aef5fdc1..466e8f94 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -9,7 +9,7 @@
 sphinx_rtd_theme ~= 3.1
 
 # Sphinx Extenstions
-sphinxcontrib-mermaid ~= 2.0
+sphinxcontrib-mermaid ~= 2.1
 autoapi ~= 2.0.1
 sphinx_design ~= 0.7.0
 sphinx-copybutton ~= 0.5.2