diff --git a/lib/govuk_tech_docs/version.rb b/lib/govuk_tech_docs/version.rb
index 39c17cdc..4f2dcb9a 100644
--- a/lib/govuk_tech_docs/version.rb
+++ b/lib/govuk_tech_docs/version.rb
@@ -1,3 +1,3 @@
 module GovukTechDocs
-  VERSION = "3.5.0".freeze
+  VERSION = "4.0.0".freeze
 end