diff --git a/terria/build/TerriaJS/doc/guide/requirements.txt b/terria/build/TerriaJS/doc/guide/requirements.txt
index 4f4b140..a3e93cc 100644
--- a/terria/build/TerriaJS/doc/guide/requirements.txt
+++ b/terria/build/TerriaJS/doc/guide/requirements.txt
@@ -5,7 +5,7 @@ Markdown==2.6.11
 MarkupSafe==1.0
 mkdocs==0.17.2
 mkdocs-material==2.7.0
-Pygments==2.2.0
+Pygments==2.15.0
 pymdown-extensions==4.9
 PyYAML==5.1
 six==1.11.0