diff --git a/dune-project b/dune-project
index 8d819808..1a6d448f 100644
--- a/dune-project
+++ b/dune-project
@@ -4,6 +4,8 @@
 (source
  (github aestheticintegration/ocaml-opentelemetry))
 
+(version 0.1)
+
 (authors "the Imandra team")
 (maintainers "the Imandra team")
 (license MIT)
diff --git a/opentelemetry-client-ocurl.opam b/opentelemetry-client-ocurl.opam
index 7133660b..9b882f13 100644
--- a/opentelemetry-client-ocurl.opam
+++ b/opentelemetry-client-ocurl.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "0.1"
 synopsis: "Collector client for opentelemetry, using http + ocurl"
 maintainer: ["the Imandra team"]
 authors: ["the Imandra team"]
diff --git a/opentelemetry-cohttp-lwt.opam b/opentelemetry-cohttp-lwt.opam
index af591c09..7b6a9b5e 100644
--- a/opentelemetry-cohttp-lwt.opam
+++ b/opentelemetry-cohttp-lwt.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "0.1"
 synopsis: "Opentelemetry tracing for Cohttp HTTP servers"
 maintainer: ["the Imandra team"]
 authors: ["the Imandra team"]
diff --git a/opentelemetry-lwt.opam b/opentelemetry-lwt.opam
index 601fcf69..efdf941f 100644
--- a/opentelemetry-lwt.opam
+++ b/opentelemetry-lwt.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "0.1"
 synopsis: "Lwt-compatible instrumentation for https://opentelemetry.io"
 maintainer: ["the Imandra team"]
 authors: ["the Imandra team"]
diff --git a/opentelemetry.opam b/opentelemetry.opam
index 4c7190b1..bf86cc1f 100644
--- a/opentelemetry.opam
+++ b/opentelemetry.opam
@@ -1,5 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
+version: "0.1"
 synopsis: "Instrumentation for https://opentelemetry.io"
 maintainer: ["the Imandra team"]
 authors: ["the Imandra team"]