diff --git a/book/external/sphinx-iframes b/book/external/sphinx-iframes
index e21273d..89f544c 160000
--- a/book/external/sphinx-iframes
+++ b/book/external/sphinx-iframes
@@ -1 +1 @@
-Subproject commit e21273da134cbf4753da5faf9adc277b8f1c3a1c
+Subproject commit 89f544c46ca36b9e57e3f0b724fcc81667c083bf