diff --git a/CHANGES.md b/CHANGES.md
index 3107b081..1ef394e8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,9 @@
 
+## 2.3
+
+- allow `optional` in proto3 files
+- improve compatibility with OCaml 5
+
 ## 2.2
 
 - handle `stream` as a name (#179)
diff --git a/ocaml-protoc.opam b/ocaml-protoc.opam
index bfa9c580..21d5dc0d 100644
--- a/ocaml-protoc.opam
+++ b/ocaml-protoc.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "ocaml-protoc"
-version: "2.2"
+version: "2.3"
 synopsis: "Protobuf compiler for OCaml"
 description: "Protobuf compiler for OCaml"
 maintainer: "Maxime Ransan <maxime.ransan@gmail.com>"
diff --git a/pbrt.opam b/pbrt.opam
index 9d6ee073..3ff7b574 100644
--- a/pbrt.opam
+++ b/pbrt.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "pbrt"
-version: "2.2"
+version: "2.3"
 synopsis: "Runtime library for Protobuf tooling"
 description: "Runtime library for Protobuf tooling"
 maintainer: "Maxime Ransan <maxime.ransan@gmail.com>"