diff --git a/requirements.txt b/requirements.txt
index 1fde9fd..88d1619 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ mkdocs-material==9.7.6
 mkdocstrings[python]==0.25.2
 ford==7.0.13
 mkdocs-autorefs==1.3.1
+pygments==2.17.2