diff --git a/book/external/Sphinx-Image-Inverter b/book/external/Sphinx-Image-Inverter
index 20d8d6d..250103c 160000
--- a/book/external/Sphinx-Image-Inverter
+++ b/book/external/Sphinx-Image-Inverter
@@ -1 +1 @@
-Subproject commit 20d8d6d1280edbb2e6df9639fe66c28b58d2e63c
+Subproject commit 250103c723aa782bcec785ae3d241cb1ffebd3d0