diff --git a/books/w-python-matplotlib b/books/w-python-matplotlib
index 52c65db..ff44244 160000
--- a/books/w-python-matplotlib
+++ b/books/w-python-matplotlib
@@ -1 +1 @@
-Subproject commit 52c65db1d2c27388d0c7d2a6c2fc5887b90c37a8
+Subproject commit ff4424470c5cac4a8e8ae073b8a59aa953ecc92a