diff --git a/requirements.txt b/requirements.txt
index 67ca84141..92ce08e4a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,4 +24,4 @@ markdown>=3.2
 mkdocs>=1.3.0
 mkdocs-material-extensions>=1.0.3
 pygments>=2.10,<2.12
-pymdown-extensions>=9.0
+pymdown-extensions>=9.0,<9.4