diff --git a/meson_options.txt b/meson_options.txt
index 64a5b7e..b7f4927 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -80,7 +80,7 @@
 
 option(
     'class-version', type: 'integer',
-    value: 1,
+    value: 2,
     description: 'Class version to register with Cereal.',
 )