diff --git a/book/external/learn-programming b/book/external/learn-programming
index 1e53d4f..1b6bc13 160000
--- a/book/external/learn-programming
+++ b/book/external/learn-programming
@@ -1 +1 @@
-Subproject commit 1e53d4f545797d14fd57f8ef28fec4bcc2fb14ea
+Subproject commit 1b6bc1340333d7341af701884c721e7cd7137ccd