diff --git a/Makefile.am b/Makefile.am
index e53cb6a875..2d10b20520 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -36,40 +36,40 @@ MAINTAINERCLEANFILES = \
 
 
 ## Copy .pc files to target-specific names
-gtk+-x11-3.0.pc gtk+-win32-3.0.pc gtk+-quartz-3.0.pc gtk+-broadway-3.0.pc gtk+-wayland-3.0.pc gtk+-mir-3.0.pc: gtk+-3.0.pc
+gtk+-x11-4.0.pc gtk+-win32-4.0.pc gtk+-quartz-4.0.pc gtk+-broadway-4.0.pc gtk+-wayland-4.0.pc gtk+-mir-4.0.pc: gtk+-4.0.pc
 	rm -f $@ && \
-	cp gtk+-3.0.pc $@
+	cp gtk+-4.0.pc $@
 
-gdk-x11-3.0.pc gdk-win32-3.0.pc gdk-quartz-3.0.pc gdk-broadway-3.0.pc gdk-wayland-3.0.pc gdk-mir-3.0.pc: gdk-3.0.pc
+gdk-x11-4.0.pc gdk-win32-4.0.pc gdk-quartz-4.0.pc gdk-broadway-4.0.pc gdk-wayland-4.0.pc gdk-mir-4.0.pc: gdk-4.0.pc
 	rm -f $@ && \
-	cp gdk-3.0.pc $@
+	cp gdk-4.0.pc $@
 
 pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = gdk-3.0.pc gtk+-3.0.pc gail-3.0.pc
-pkgconfig_DATA += ${GDK_BACKENDS:%=gtk+-%-3.0.pc}
-pkgconfig_DATA += ${GDK_BACKENDS:%=gdk-%-3.0.pc}
+pkgconfig_DATA = gdk-4.0.pc gtk+-4.0.pc gail-4.0.pc
+pkgconfig_DATA += ${GDK_BACKENDS:%=gtk+-%-4.0.pc}
+pkgconfig_DATA += ${GDK_BACKENDS:%=gdk-%-4.0.pc}
 
 if OS_UNIX
-pkgconfig_DATA += gtk+-unix-print-3.0.pc
+pkgconfig_DATA += gtk+-unix-print-4.0.pc
 endif
 
 DISTCLEANFILES = \
-	gtk+-unix-print-3.0.pc		\
-	gtk+-3.0.pc			\
-	gtk+-x11-3.0.pc			\
-	gtk+-win32-3.0.pc		\
-	gtk+-quartz-3.0.pc		\
-	gtk+-broadway-3.0.pc		\
-	gtk+-wayland-3.0.pc		\
-	gtk+-mir-3.0.pc			\
-	gdk-3.0.pc			\
-	gdk-x11-3.0.pc			\
-	gdk-win32-3.0.pc		\
-	gdk-quartz-3.0.pc		\
-	gdk-broadway-3.0.pc		\
-	gdk-wayland-3.0.pc		\
-	gdk-mir-3.0.pc			\
-	gail-3.0.pc			\
+	gtk+-unix-print-4.0.pc		\
+	gtk+-4.0.pc			\
+	gtk+-x11-4.0.pc			\
+	gtk+-win32-4.0.pc		\
+	gtk+-quartz-4.0.pc		\
+	gtk+-broadway-4.0.pc		\
+	gtk+-wayland-4.0.pc		\
+	gtk+-mir-4.0.pc			\
+	gdk-4.0.pc			\
+	gdk-x11-4.0.pc			\
+	gdk-win32-4.0.pc		\
+	gdk-quartz-4.0.pc		\
+	gdk-broadway-4.0.pc		\
+	gdk-wayland-4.0.pc		\
+	gdk-mir-4.0.pc			\
+	gail-4.0.pc			\
 	config.lt
 
 distclean-local:
@@ -93,7 +93,7 @@ ChangeLog:
 .PHONY: ChangeLog
 
 uninstall-local:
-	rm -f $(DESTDIR)$(pkgconfigdir)/gtk+-3.0.pc
+	rm -f $(DESTDIR)$(pkgconfigdir)/gtk+-4.0.pc
 
 AM_DISTCHECK_CONFIGURE_FLAGS =		\
 	--enable-gtk-doc 		\
diff --git a/configure.ac b/configure.ac
index a0999a29d6..b0e35e686e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1891,10 +1891,10 @@ INSTALL
 config.h.win32
 gtk-zip.sh
 Makefile
-gdk-3.0.pc
-gtk+-3.0.pc
-gtk+-unix-print-3.0.pc
-gail-3.0.pc
+gdk-4.0.pc
+gtk+-4.0.pc
+gtk+-unix-print-4.0.pc
+gail-4.0.pc
 m4macros/Makefile
 po/Makefile.in
 po-properties/Makefile.in
diff --git a/gail-3.0.pc.in b/gail-4.0.pc.in
similarity index 66%
rename from gail-3.0.pc.in
rename to gail-4.0.pc.in
index 9777545c02..e60f430242 100644
--- a/gail-3.0.pc.in
+++ b/gail-4.0.pc.in
@@ -6,6 +6,6 @@ includedir=@includedir@
 Name: Gail
 Description: GNOME Accessibility Implementation Library
 Version: @VERSION@
-Requires: atk gtk+-3.0
-Libs: -L${libdir} -lgailutil-3
-Cflags: -I${includedir}/gail-3.0
+Requires: atk gtk+-4.0
+Libs: -L${libdir} -lgailutil-4
+Cflags: -I${includedir}/gail-4.0
diff --git a/gdk-3.0.pc.in b/gdk-4.0.pc.in
similarity index 87%
rename from gdk-3.0.pc.in
rename to gdk-4.0.pc.in
index 97b0537291..6862697370 100644
--- a/gdk-3.0.pc.in
+++ b/gdk-4.0.pc.in
@@ -9,5 +9,5 @@ Description: GTK+ Drawing Kit
 Version: @VERSION@
 Requires: @GDK_PACKAGES@
 Requires.private: @GDK_PRIVATE_PACKAGES@
-Libs: -L${libdir} -lgdk-3 @GDK_EXTRA_LIBS@
+Libs: -L${libdir} -lgdk-4 @GDK_EXTRA_LIBS@
 Cflags: -I${includedir}/gtk-@GTK_API_VERSION@ @GDK_EXTRA_CFLAGS@
diff --git a/gtk+-3.0.pc.in b/gtk+-4.0.pc.in
similarity index 89%
rename from gtk+-3.0.pc.in
rename to gtk+-4.0.pc.in
index cf5d3be677..cc5b53c7ef 100644
--- a/gtk+-3.0.pc.in
+++ b/gtk+-4.0.pc.in
@@ -12,5 +12,5 @@ Description: GTK+ Graphical UI Library
 Version: @VERSION@
 Requires: gdk-@GTK_API_VERSION@ @GTK_PACKAGES@
 Requires.private: @GTK_PRIVATE_PACKAGES@
-Libs: -L${libdir} -lgtk-3 @GTK_EXTRA_LIBS@
+Libs: -L${libdir} -lgtk-4 @GTK_EXTRA_LIBS@
 Cflags: -I${includedir}/gtk-@GTK_API_VERSION@ @GTK_EXTRA_CFLAGS@
diff --git a/gtk+-unix-print-3.0.pc.in b/gtk+-unix-print-4.0.pc.in
similarity index 100%
rename from gtk+-unix-print-3.0.pc.in
rename to gtk+-unix-print-4.0.pc.in