diff --git a/VERSION b/VERSION
index 61fcc8735..09b254e90 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-5.1.2
+6.0.0
diff --git a/ocsigenserver.opam b/ocsigenserver.opam
index 4b192f762..26aca5d71 100644
--- a/ocsigenserver.opam
+++ b/ocsigenserver.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "ocsigenserver"
-version: "5.1.2"
+version: "6.0.0"
 maintainer: "dev@ocsigen.org"
 synopsis: "A full-featured and extensible Web server"
 description: "Ocsigen Server implements most features of the HTTP protocol, and has a very powerful extension mechanism that makes it very easy to plug your own OCaml modules for generating pages. Many extensions are already implemented, like a reverse proxy, content compression, access control, authentication, etc."