diff --git a/requirements.txt b/requirements.txt
index 1596ca3..539cb83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -76,6 +76,7 @@ pygments==2.19.2
 pyyaml==6.0.2
     # via
     #   myst-parser
+    #   sphinxcontrib-mermaid
     #   wavedrom
 requests==2.32.5
     # via
@@ -100,6 +101,7 @@ sphinx==8.2.3
     #   sphinx-rtd-theme
     #   sphinxcontrib-images
     #   sphinxcontrib-jquery
+    #   sphinxcontrib-mermaid
     #   sphinxcontrib-video
     #   sphinxcontrib-wavedrom
 sphinx-book-theme==1.1.4
@@ -124,10 +126,10 @@ sphinxcontrib-jquery==4.1
     # via sphinx-rtd-theme
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
+sphinxcontrib-mermaid==1.0.0
+    # via -r requirements.in
 sphinxcontrib-qthelp==2.0.0
     # via sphinx
-sphinxcontrib-mermaid>=1.0.0
-    # via sphinx
 sphinxcontrib-serializinghtml==2.0.0
     # via sphinx
 sphinxcontrib-video==0.4.1