diff --git a/pyproject.toml b/pyproject.toml
index 40bf160574..7741980ec5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ gui = [
   "blockdiag==3.0.0",
   "docutils==0.21.2",
   "Jinja2==3.1.6",
-  "Pygments==2.18.0",
+  "Pygments==2.20.0",
   "Sphinx==9.0.4",
   "sphinxcontrib-blockdiag==3.0.0",
   "sphinx_autodoc_typehints==3.6.1",
@@ -115,7 +115,7 @@ wheel = [
   "blockdiag==3.0.0",
   "docutils==0.21.2",
   "Jinja2==3.1.6",
-  "Pygments==2.18.0",
+  "Pygments==2.20.0",
   #
   # Windows
   #