diff --git a/CHANGES.md b/CHANGES.md
index afcc84b..d01e984 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,11 @@
 
+# 0.3
+
+
+- add explicit spans, for more precise tracing
+- rename repo to ocaml-trace
+- trace-tef: add a ticker thread to ensure we flush the file regularly
+
 # 0.2
 
 - trace-tef: additional argument to `with_setup`; env for "stdout"/"stderr"
diff --git a/Makefile b/Makefile
index a992a93..f575c6d 100644
--- a/Makefile
+++ b/Makefile
@@ -17,3 +17,12 @@ watch:
 	dune build $(DUNE_OPTS) -w $(WATCH)
 
 .PHONY: test clean watch
+
+VERSION=$(shell awk '/^version:/ {print $$2}' trace.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/dune-project b/dune-project
index 5b5b2ac..5d4bce1 100644
--- a/dune-project
+++ b/dune-project
@@ -2,7 +2,7 @@
 
 (name trace)
 (generate_opam_files true)
-(version 0.2)
+(version 0.3)
 
 (source
  (github c-cube/ocaml-trace))
diff --git a/src/core/collector.ml b/src/core/collector.ml
index 0ba5ffc..9758878 100644
--- a/src/core/collector.ml
+++ b/src/core/collector.ml
@@ -29,7 +29,7 @@ module type S = sig
 
       This replaces the previous [enter_span] and [exit_span] which were too flexible
       to be efficient to implement in async contexts.
-     @since NEXT_RELEASE *)
+     @since 0.3 *)
 
   val enter_manual_span :
     parent:explicit_span option ->
@@ -47,11 +47,11 @@ module type S = sig
       This means that the collector doesn't need to implement contextual
       storage mapping {!span} to scopes, metadata, etc. on its side;
       everything can be transmitted in the {!explicit_span}.
-      @since NEXT_RELEASE *)
+      @since 0.3 *)
 
   val exit_manual_span : explicit_span -> unit
   (** Exit an explicit span.
-      @since NEXT_RELEASE *)
+      @since 0.3 *)
 
   val message : ?span:span -> data:(string * user_data) list -> string -> unit
   (** Emit a message with associated metadata. *)
diff --git a/src/core/trace_core.mli b/src/core/trace_core.mli
index 6e1d1ae..66a9b18 100644
--- a/src/core/trace_core.mli
+++ b/src/core/trace_core.mli
@@ -51,7 +51,7 @@ val enter_manual_sub_span :
       start and stop on one thread, and are nested purely by their timestamp;
       and [`Async] spans can overlap, migrate between threads, etc. (as happens in
       Lwt, Eio, Async, etc.) which impacts how the collector might represent them.
-    @since NEXT_RELEASE *)
+    @since 0.3 *)
 
 val enter_manual_toplevel_span :
   ?flavor:[ `Sync | `Async ] ->
@@ -65,7 +65,7 @@ val enter_manual_toplevel_span :
     [explicit_span] around until it's exited with {!exit_manual_span}.
     The span can be used as a parent in {!enter_manual_sub_span}.
     @param flavor see {!enter_manual_sub_span} for more details.
-    @since NEXT_RELEASE *)
+    @since 0.3 *)
 
 val exit_manual_span : explicit_span -> unit
 (** Exit an explicit span. This can be on another thread, in a
@@ -73,7 +73,7 @@ val exit_manual_span : explicit_span -> unit
     nonetheless.
     The span can be obtained via {!enter_manual_sub_span} or
     {!enter_manual_toplevel_span}.
-    @since NEXT_RELEASE *)
+    @since 0.3 *)
 
 val message :
   ?span:span -> ?data:(unit -> (string * user_data) list) -> string -> unit
diff --git a/trace-tef.opam b/trace-tef.opam
index eed0942..16a126f 100644
--- a/trace-tef.opam
+++ b/trace-tef.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.2"
+version: "0.3"
 synopsis: "A simple backend for trace, emitting Catapult JSON into a file"
 maintainer: ["Simon Cruanes"]
 authors: ["Simon Cruanes"]
diff --git a/trace.opam b/trace.opam
index 61856b1..f485ac7 100644
--- a/trace.opam
+++ b/trace.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.2"
+version: "0.3"
 synopsis:
   "A stub for tracing/observability, agnostic in how data is collected"
 maintainer: ["Simon Cruanes"]