diff --git a/CHANGES.md b/CHANGES.md
index 67b61ea6..18e79d9b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,8 @@
 
+## 0.11.1
+
+- add missing sample argument to `Traceparent.to_value`
+
 ## 0.11
 
 - add `Span_kind.t`, add {kind,set_kind} to `Scope`
diff --git a/dune-project b/dune-project
index af08f8c0..7f428494 100644
--- a/dune-project
+++ b/dune-project
@@ -7,7 +7,7 @@
 (source
  (github imandra-ai/ocaml-opentelemetry))
 
-(version 0.11)
+(version 0.11.1)
 
 (authors "the Imandra team and contributors")
 
diff --git a/opentelemetry-client-cohttp-lwt.opam b/opentelemetry-client-cohttp-lwt.opam
index 333e156c..cb76211f 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: "0.11"
+version: "0.11.1"
 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 4f06d970..062a9e67 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: "0.11"
+version: "0.11.1"
 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 cd88a21a..d71bb8ed 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: "0.11"
+version: "0.11.1"
 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 d4d5c59a..2a141a68 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: "0.11"
+version: "0.11.1"
 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 be1f8a3f..00eb6639 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: "0.11"
+version: "0.11.1"
 synopsis: "Instrumentation for https://opentelemetry.io"
 maintainer: [
   "Simon Cruanes <simon.cruanes.2007@m4x.org>"