diff --git a/INSTALL.in b/INSTALL.in
index ae3bf4f846..e28a0674a8 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -4,7 +4,7 @@ Prerequisites
 GTK+ requires the following packages:
 
  - The GLib, Pango, ATK and cairo libraries, available at the same
-   location as GTK+. GTK+ @GTK_VERSION@ requires at least GLib 2.21.3,
+   location as GTK+. GTK+ @GTK_VERSION@ requires at least GLib 2.23.6,
    Pango 1.20, ATK 1.29.2 and cairo 1.6.0.
 
  - The TIFF, PNG, and JPEG image loading libraries. You most