diff --git a/book/external/Sphinx-Named-Colors b/book/external/Sphinx-Named-Colors
index 2ae6342..191c2f4 160000
--- a/book/external/Sphinx-Named-Colors
+++ b/book/external/Sphinx-Named-Colors
@@ -1 +1 @@
-Subproject commit 2ae6342aa7d1b341d046db10de5b713cdeff4ecb
+Subproject commit 191c2f4ac1755d3b50c6a63950eb6c2e5c035d75