diff --git a/Makefile.am b/Makefile.am
index 4082eed..ee41524 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -151,7 +151,7 @@ libpkgconf_la_SOURCES  =	\
 		libpkgconf/path.c		\
 		libpkgconf/personality.c	\
 		libpkgconf/parser.c
-libpkgconf_la_LDFLAGS = -no-undefined -version-info 3:0:0 -export-symbols-regex '^pkgconf_'
+libpkgconf_la_LDFLAGS = -no-undefined -version-info 4:0:0 -export-symbols-regex '^pkgconf_'
 
 dist_man_MANS    = 		\
 	man/pkgconf.1		\
diff --git a/meson.build b/meson.build
index 88ef05b..7051e40 100644
--- a/meson.build
+++ b/meson.build
@@ -82,8 +82,8 @@ libpkgconf = library('pkgconf',
   'libpkgconf/tuple.c',
   c_args: ['-DLIBPKGCONF_EXPORT', build_static],
   install : true,
-  version : '3.0.0',
-  soversion : '3',
+  version : '4.0.0',
+  soversion : '4',
 )
 
 # For other projects using libpkgconfig as a subproject