diff --git a/lib/jekyll/webmention_io/version.rb b/lib/jekyll/webmention_io/version.rb
index f3df6261..4648c41 100644
--- a/lib/jekyll/webmention_io/version.rb
+++ b/lib/jekyll/webmention_io/version.rb
@@ -2,6 +2,6 @@
 
 module Jekyll
   module WebmentionIO
-    VERSION = "3.3.7"
+    VERSION = "4.0.0"
   end
 end