diff --git a/requirements_doc.txt b/requirements_doc.txt
index 6908463..0b47505 100644
--- a/requirements_doc.txt
+++ b/requirements_doc.txt
@@ -26,7 +26,7 @@ packaging==24.1
     # via sphinx
 py==1.11.0
     # via dials-data (pyproject.toml)
-pygments==2.18.0
+pygments==2.20.0
     # via sphinx
 pyyaml==6.0.1
     # via dials-data (pyproject.toml)