diff --git a/book/external/sphinx-iframes b/book/external/sphinx-iframes
index 7663b1f..077ba23 160000
--- a/book/external/sphinx-iframes
+++ b/book/external/sphinx-iframes
@@ -1 +1 @@
-Subproject commit 7663b1f326e11617a8a35aec7cda0f3d67135551
+Subproject commit 077ba23fa29ef1f0dd454f2ebf93c107923d1068