diff --git a/_external/resources/wai-intro-wcag b/_external/resources/wai-intro-wcag
index edff5c3b041..df978cde460 160000
--- a/_external/resources/wai-intro-wcag
+++ b/_external/resources/wai-intro-wcag
@@ -1 +1 @@
-Subproject commit edff5c3b0411668b21e093e092addd777fe59a3d
+Subproject commit df978cde460e87774e9999cd60e41d98e3182a76