diff --git a/js_of_ocaml-camlp4.opam b/js_of_ocaml-camlp4.opam
index 523df94926..08f930f848 100644
--- a/js_of_ocaml-camlp4.opam
+++ b/js_of_ocaml-camlp4.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-camlp4"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-compiler.opam b/js_of_ocaml-compiler.opam
index c07cf1e3d9..1591fe90f9 100644
--- a/js_of_ocaml-compiler.opam
+++ b/js_of_ocaml-compiler.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-compiler"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-lwt.opam b/js_of_ocaml-lwt.opam
index 3bf67a8880..b89497cbc5 100644
--- a/js_of_ocaml-lwt.opam
+++ b/js_of_ocaml-lwt.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-lwt"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-ocamlbuild.opam b/js_of_ocaml-ocamlbuild.opam
index 4b3b340fbc..7ef3eb91a2 100644
--- a/js_of_ocaml-ocamlbuild.opam
+++ b/js_of_ocaml-ocamlbuild.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-ocamlbuild"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-ppx.opam b/js_of_ocaml-ppx.opam
index 68a255bf9f..0192ea078e 100644
--- a/js_of_ocaml-ppx.opam
+++ b/js_of_ocaml-ppx.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-ppx"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-toplevel.opam b/js_of_ocaml-toplevel.opam
index 282905aa10..38e6072a1a 100644
--- a/js_of_ocaml-toplevel.opam
+++ b/js_of_ocaml-toplevel.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-toplevel"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml-tyxml.opam b/js_of_ocaml-tyxml.opam
index 1251eaec6e..329c6942b7 100644
--- a/js_of_ocaml-tyxml.opam
+++ b/js_of_ocaml-tyxml.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml-tyxml"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/js_of_ocaml.opam b/js_of_ocaml.opam
index bac7fcb9eb..eefe9f6234 100644
--- a/js_of_ocaml.opam
+++ b/js_of_ocaml.opam
@@ -6,7 +6,7 @@ homepage:     "http://ocsigen.org/js_of_ocaml"
 dev-repo:     "git+https://github.com/ocsigen/js_of_ocaml.git"
 
 name: "js_of_ocaml"
-version: "3.0"
+version: "dev"
 
 build: [["jbuilder" "build" "-p" name "-j" jobs]]
 
diff --git a/lib/js_of_ocaml.ml b/lib/js_of_ocaml.ml
index da462c3a53..4dbc64de4e 100644
--- a/lib/js_of_ocaml.ml
+++ b/lib/js_of_ocaml.ml
@@ -17,7 +17,6 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *)
 
-module Lib_version = Lib_version
 module Js = Js
 module Dom = Dom
 module Typed_array = Typed_array