diff --git a/CHANGES.md b/CHANGES.md
index 99eac31e..83d24ac0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,11 @@
+## 0.12
+
+- add dep on `seq`
+- add a `Html` module with combinators to produce html
+- add `Tiny_httpd_dir.VFS` to emulate file systems
+- add a small program, `tiny-httpd-vfs-pack`, to pack directories and files
+  (local or behind a URL) into a OCaml module using `VFS`
+- show small example of socket activation
 
 ## 0.11
 
diff --git a/Makefile b/Makefile
index 39fceab8..85661a75 100644
--- a/Makefile
+++ b/Makefile
@@ -18,3 +18,12 @@ watch:
 	@dune build @all -w
 
 .PHONY: benchs tests build watch
+
+VERSION=$(shell awk '/^version:/ {print $$2}' tiny_httpd.opam)
+
+update_next_tag:
+	@echo "update version to $(VERSION)..."
+	sed --follow-symlinks -i "s/NEXT_VERSION/$(VERSION)/g" $(wildcard src/**.ml) $(wildcard src/**.mli) \
+			$(wildcard src/**/*.ml) $(wildcard src/**/*.mli)
+	sed --follow-symlinks -i "s/NEXT_RELEASE/$(VERSION)/g" $(wildcard src/**.ml) $(wildcard src/**.mli) \
+		$(wildcard src/**/*.ml) $(wildcard src/**/*.mli)
diff --git a/src/Tiny_httpd_buf.mli b/src/Tiny_httpd_buf.mli
index 24f3c42b..aa93551f 100644
--- a/src/Tiny_httpd_buf.mli
+++ b/src/Tiny_httpd_buf.mli
@@ -4,7 +4,7 @@
     These buffers are used to avoid allocating too many byte arrays when
     processing streams and parsing requests.
 
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 
 type t
diff --git a/src/Tiny_httpd_dir.mli b/src/Tiny_httpd_dir.mli
index 67bf5f51..34e622fd 100644
--- a/src/Tiny_httpd_dir.mli
+++ b/src/Tiny_httpd_dir.mli
@@ -68,7 +68,7 @@ val config :
   unit ->
   config
 (** Build a config from {!default_config}.
-    @since NEXT_RELEASE *)
+    @since 0.12 *)
 
 (** [add_dirpath ~config ~dir ~prefix server] adds route handle to the
     [server] to serve static files in [dir] when url starts with [prefix],
@@ -83,7 +83,7 @@ val add_dir_path :
 
     This is used to emulate a file system from pure OCaml functions and data,
     e.g. for resources bundled inside the web server.
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 module type VFS = sig
   val descr : string
@@ -118,7 +118,7 @@ end
 val vfs_of_dir : string -> (module VFS)
 (** [vfs_of_dir dir] makes a virtual file system that reads from the
     disk.
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 
 val add_vfs :
@@ -127,14 +127,14 @@ val add_vfs :
   prefix:string ->
   Tiny_httpd_server.t -> unit
 (** Similar to {!add_dir_path} but using a virtual file system instead.
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 
 (** An embedded file system, as a list of files with (relative) paths.
     This is useful in combination with the "tiny-httpd-mkfs" tool,
     which embeds the files it's given into a OCaml module.
 
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 module Embedded_fs : sig
   type t
diff --git a/src/Tiny_httpd_html.ml b/src/Tiny_httpd_html.ml
index 6188fa29..987798d7 100644
--- a/src/Tiny_httpd_html.ml
+++ b/src/Tiny_httpd_html.ml
@@ -4,7 +4,7 @@
     This module provides combinators to produce html. It doesn't enforce
     the well-formedness of the html, unlike Tyxml, but it's simple and should
     be reasonably efficient.
-    @since NEXT_RELEASE
+    @since 0.12
 *)
 
 (** @inline *)
diff --git a/src/gen/gentags.ml b/src/gen/gentags.ml
index 43a6fc2a..19ce5aaa 100644
--- a/src/gen/gentags.ml
+++ b/src/gen/gentags.ml
@@ -283,7 +283,7 @@ let prelude = {|
     This output type is used to produce a string reasonably efficiently from
     a tree of combinators.
 
-    @since NEXT_RELEASE
+    @since 0.12
     @open *)
 module Out : sig
   type t
diff --git a/tiny_httpd.opam b/tiny_httpd.opam
index d0ea743a..56345eb9 100644
--- a/tiny_httpd.opam
+++ b/tiny_httpd.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "0.11"
+version: "0.12"
 authors: ["Simon Cruanes"]
 maintainer: "simon.cruanes.2007@m4x.org"
 license: "MIT"
diff --git a/tiny_httpd_camlzip.opam b/tiny_httpd_camlzip.opam
index 11da244a..0bc0ff12 100644
--- a/tiny_httpd_camlzip.opam
+++ b/tiny_httpd_camlzip.opam
@@ -1,5 +1,5 @@
 opam-version: "2.0"
-version: "0.11"
+version: "0.12"
 authors: ["Simon Cruanes"]
 maintainer: "simon.cruanes.2007@m4x.org"
 license: "MIT"