diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a366f387..35780eb4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -49,7 +49,7 @@ jobs:
 
       - run: opam exec -- dune build @install -p opentelemetry,opentelemetry-lwt,opentelemetry-client-ocurl,opentelemetry-cohttp-lwt,opentelemetry-client-cohttp-lwt
 
-      - run: opam install trace.0.7
+      - run: opam install trace.0.9
       - run: opam exec -- dune build @install -p opentelemetry
 
       - run: opam install ocaml-protoc
diff --git a/CHANGES.md b/CHANGES.md
index 471daf64..67b61ea6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,19 @@
 
+## 0.11
+
+- add `Span_kind.t`, add {kind,set_kind} to `Scope`
+- expose `Span_status` types
+- add `Scope.set_span_status`
+- add `record_exception`
+- otel.trace: extension points for links, record_exn, kind
+- otel.trace: set status of a span based on `exception.message`
+
+- add cohttp upper bound version constraint
+- in backends, call `tick()` before cleaning up
+- reduce memory usage of `Scope.t` (@tatchi)
+
+- remove dependency on ambient-context, vendor/inline/specialize it
+
 ## 0.10
 
 - feat: add support for per-signal urls (by @tatchi)
diff --git a/dune-project b/dune-project
index 91e27d51..af08f8c0 100644
--- a/dune-project
+++ b/dune-project
@@ -7,7 +7,7 @@
 (source
  (github imandra-ai/ocaml-opentelemetry))
 
-(version 0.10)
+(version 0.11)
 
 (authors "the Imandra team and contributors")
 
@@ -48,7 +48,7 @@
  (depopts trace lwt eio)
  (conflicts
   (trace
-   (< 0.7)))
+   (< 0.9)))
  (tags
   (instrumentation tracing opentelemetry datadog jaeger)))
 
diff --git a/opentelemetry-client-cohttp-lwt.opam b/opentelemetry-client-cohttp-lwt.opam
index 2b66f73d..333e156c 100644
--- a/opentelemetry-client-cohttp-lwt.opam
+++ b/opentelemetry-client-cohttp-lwt.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.10"
+version: "0.11"
 synopsis: "Collector client for opentelemetry, using cohttp + lwt"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"
diff --git a/opentelemetry-client-ocurl.opam b/opentelemetry-client-ocurl.opam
index f79b70f4..4f06d970 100644
--- a/opentelemetry-client-ocurl.opam
+++ b/opentelemetry-client-ocurl.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.10"
+version: "0.11"
 synopsis: "Collector client for opentelemetry, using http + ezcurl"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"
diff --git a/opentelemetry-cohttp-lwt.opam b/opentelemetry-cohttp-lwt.opam
index 0a1490ca..cd88a21a 100644
--- a/opentelemetry-cohttp-lwt.opam
+++ b/opentelemetry-cohttp-lwt.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.10"
+version: "0.11"
 synopsis: "Opentelemetry tracing for Cohttp HTTP servers"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"
diff --git a/opentelemetry-lwt.opam b/opentelemetry-lwt.opam
index 1801246a..d4d5c59a 100644
--- a/opentelemetry-lwt.opam
+++ b/opentelemetry-lwt.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.10"
+version: "0.11"
 synopsis: "Lwt-compatible instrumentation for https://opentelemetry.io"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"
diff --git a/opentelemetry.opam b/opentelemetry.opam
index 80da4b91..be1f8a3f 100644
--- a/opentelemetry.opam
+++ b/opentelemetry.opam
@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.10"
+version: "0.11"
 synopsis: "Instrumentation for https://opentelemetry.io"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"
@@ -27,7 +27,7 @@ depends: [
 ]
 depopts: ["trace" "lwt" "eio"]
 conflicts: [
-  "trace" {< "0.7"}
+  "trace" {< "0.9"}
 ]
 build: [
   ["dune" "subst"] {dev}