diff --git a/lib/govuk_design_system_formbuilder/version.rb b/lib/govuk_design_system_formbuilder/version.rb
index 4f6baa32..b09c15c2 100644
--- a/lib/govuk_design_system_formbuilder/version.rb
+++ b/lib/govuk_design_system_formbuilder/version.rb
@@ -1,3 +1,3 @@
 module GOVUKDesignSystemFormBuilder
-  VERSION = '4.0.0a1'.freeze
+  VERSION = '4.0.0rc1'.freeze
 end