diff --git a/meson.build b/meson.build
index 20dbfd9ce..3c4bef6bc 100644
--- a/meson.build
+++ b/meson.build
@@ -7,7 +7,7 @@ project('mutter', 'c',
 split_version = meson.project_version().split('.')
 
 # API version, bump each development cycle
-libmutter_api_version = '12'
+libmutter_api_version = '13'
 
 mutter_srcdir = meson.current_source_dir()
 mutter_builddir = meson.current_build_dir()