diff --git a/doc/requirements/dev.txt b/doc/requirements/dev.txt
index 156c124a8..eec0cc4ff 100644
--- a/doc/requirements/dev.txt
+++ b/doc/requirements/dev.txt
@@ -1,6 +1,6 @@
 Sphinx==4.1.2
 pyparsing==2.4.7
-Pygments==2.10.0
+Pygments==2.15.0
 actdiag==3.0.0
 blockdiag==3.0.0
 sphinxcontrib-actdiag==3.0.0