From c88567366791bbfb51d03c8e4275b776ac57da1b Mon Sep 17 00:00:00 2001
From: Kozova1 <30871100+Kozova1@users.noreply.github.com>
Date: Sun, 14 Feb 2021 21:19:13 +0200
Subject: [PATCH] Change Programming with gtkmm 3 -> Programming with gtkmm 4
 (#5296)

The book has changed its title to this.
---
 books/free-programming-books.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/books/free-programming-books.md b/books/free-programming-books.md
index 47b3a200..4c57f7fe 100644
--- a/books/free-programming-books.md
+++ b/books/free-programming-books.md
@@ -308,7 +308,7 @@
 
 ### Graphical User Interfaces
 
-* [Programming with gtkmm 3](https://developer.gnome.org/gtkmm-tutorial/stable/)
+* [Programming with gtkmm 4](https://developer.gnome.org/gtkmm-tutorial/stable/)
 * [Search User Interfaces](http://searchuserinterfaces.com/book/) - Marti A. Hearst
 * [The GLib/GTK+ Development Platform](https://people.gnome.org/~swilmet/glib-gtk-dev-platform.pdf) - Sébastien Wilmet (PDF)