diff --git a/requirements.txt b/requirements.txt
index cc7bf0e..1596ca3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -126,7 +126,7 @@ sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-qthelp==2.0.0
     # via sphinx
-sphinxcontrib-mermaid
+sphinxcontrib-mermaid>=1.0.0
     # via sphinx
 sphinxcontrib-serializinghtml==2.0.0
     # via sphinx