diff --git a/requirements-docs.txt b/requirements-docs.txt
index 28f483cb..8a74abef 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -206,7 +206,7 @@ smmap==5.0.1
     # via gitdb
 sqlparse==0.5.1
     # via django
-tinycss2==1.3.0
+tinycss2==1.4.0
     # via
     #   cairosvg
     #   cssselect2