diff --git a/book/external/mechanics-BSc b/book/external/mechanics-BSc
index 3fa8c1e..303c4a1 160000
--- a/book/external/mechanics-BSc
+++ b/book/external/mechanics-BSc
@@ -1 +1 @@
-Subproject commit 3fa8c1e5ee2800541ad314422f4b5e30232eb65d
+Subproject commit 303c4a1cbbb8bcf4853da252075f36b20e2b06c3