diff --git a/HACKING b/HACKING
index 36cad32cb..7807c2120 100644
--- a/HACKING
+++ b/HACKING
@@ -167,16 +167,16 @@ unmanageable diffs.
 
 GTK versions & API documentation
 --------------------------------
-Geany requires GTK >= 2.16 and GLib >= 2.20. API symbols from newer
+Geany requires GTK >= 2.24 and GLib >= 2.28. API symbols from newer
 GTK/GLib versions should be avoided or made optional to keep the source
 code building on older systems.
 
-The official GTK 2.16 API documentation may not be available online
+The official GTK 2.24 API documentation may not be available online
 anymore, so we put it on http://www.geany.org/manual/gtk/. There
 is also a tarball with all available files for download and use with
 devhelp.
 
-Using the 2.16 API documentation of the GTK libs (including GLib, GDK
+Using the 2.24 API documentation of the GTK libs (including GLib, GDK
 and Pango) has the advantages that you don't get confused by any
 newer API additions and you don't have to take care about whether
 you can use them or not.
@@ -187,8 +187,8 @@ Coding
   them down into smaller static functions where possible. This makes code
   much easier to read and maintain.
 * Use GLib types and functions - gint not int, g_free() not free().
-* Your code should build against GLib 2.20 and GTK 2.16. At least for the
-  moment, we want to keep the minimum requirement for GTK at 2.16 (of
+* Your code should build against GLib 2.27.3 and GTK 2.24. At least for the
+  moment, we want to keep the minimum requirement for GTK at 2.24 (of
   course, you can use the GTK_CHECK_VERSION macro to protect code using
   later versions).
 * Variables should be declared before statements. You can use
diff --git a/README b/README
index b1e38dbcb..e128bd8d9 100644
--- a/README
+++ b/README
@@ -28,8 +28,8 @@ The basic features of Geany are:
 
 Requirements
 ------------
-For compiling Geany yourself, you will need the GTK (>= 2.16.0)
-libraries and header files. You will also need its dependency libraries
+For compiling Geany yourself, you will need the GTK2 (>= 2.24) or
+GTK3 libraries and header files. You will also need its dependency libraries
 and header files, such as Pango, Glib and ATK. All these files are
 available at http://www.gtk.org.
 
diff --git a/configure.ac b/configure.ac
index 2ec3782a7..4ac515eee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -70,12 +70,12 @@ AS_IF([test "x$enable_gtk3" = xyes],
 	  [gtk_package=gtk+-3.0
 	   gtk_min_version=3.0],
 	  [gtk_package=gtk+-2.0
-	   gtk_min_version=2.16])
+	   gtk_min_version=2.24])
 AM_CONDITIONAL([GTK3], [test "x$gtk_package" = "xgtk+-3.0"])
 
 # GTK/GLib/GIO checks
 gtk_modules="$gtk_package >= $gtk_min_version glib-2.0 >= 2.20"
-gtk_modules_private="gio-2.0 >= 2.20 gmodule-no-export-2.0"
+gtk_modules_private="gio-2.0 >= 2.28 gmodule-no-export-2.0"
 PKG_CHECK_MODULES([GTK], [$gtk_modules $gtk_modules_private])
 AC_SUBST([DEPENDENCIES], [$gtk_modules])
 AC_SUBST([GTK_CFLAGS])
diff --git a/data/geany.glade b/data/geany.glade
index 8f99ae23c..05b775ae6 100644
--- a/data/geany.glade
+++ b/data/geany.glade
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <requires lib="gtk+" version="2.16"/>
+  <requires lib="gtk+" version="2.24"/>
   <!-- interface-naming-policy project-wide -->
   <object class="GtkAccelGroup" id="accelgroup1"/>
   <object class="GtkAdjustment" id="adjustment1">
diff --git a/doc/geany.txt b/doc/geany.txt
index ebb236023..b46fa4c24 100644
--- a/doc/geany.txt
+++ b/doc/geany.txt
@@ -103,7 +103,7 @@ Installation
 Requirements
 ------------
 
-You will need the GTK (>= 2.16.0) libraries and their dependencies
+You will need the GTK (>= 2.24) libraries and their dependencies
 (Pango, GLib and ATK). Your distro should provide packages for these,
 usually installed by default. For Windows, you can download an installer
 from the website which bundles these libraries.
@@ -120,7 +120,7 @@ Source compilation
 ------------------
 
 Compiling Geany is quite easy.
-To do so, you need the GTK (>= 2.16.0) libraries and header files.
+To do so, you need the GTK (>= 2.24) libraries and header files.
 You also need the Pango, GLib and ATK libraries and header files.
 All these files are available at http://www.gtk.org, but very often
 your distro will provide development packages to save the trouble of
diff --git a/wscript b/wscript
index 792aa06ae..1786c2d1a 100644
--- a/wscript
+++ b/wscript
@@ -54,9 +54,9 @@ from waflib.Tools.compiler_cxx import cxx_compiler
 APPNAME = 'geany'
 VERSION = '1.25'
 LINGUAS_FILE = os.path.join('po', 'LINGUAS')
-MINIMUM_GTK_VERSION = '2.16.0'
+MINIMUM_GTK_VERSION = '2.24.0'
 MINIMUM_GTK3_VERSION = '3.0.0'
-MINIMUM_GLIB_VERSION = '2.20.0'
+MINIMUM_GLIB_VERSION = '2.28.0'
 
 GEANY_LIB_VERSION = '0.0.0'