diff --git a/book/external/Sphinx-Named-Colors b/book/external/Sphinx-Named-Colors
index 730c036..3e7d914 160000
--- a/book/external/Sphinx-Named-Colors
+++ b/book/external/Sphinx-Named-Colors
@@ -1 +1 @@
-Subproject commit 730c036c4842de4a7bdae52d40ee106ac72bc8c7
+Subproject commit 3e7d91401c820d6e0b34eddc038294c2c3ab694f