diff --git a/packages/kinetic-client/kinetic-client.0.0.11/opam b/packages/kinetic-client/kinetic-client.0.0.11/opam
index d93e155d968..e2b60603fe2 100644
--- a/packages/kinetic-client/kinetic-client.0.0.11/opam
+++ b/packages/kinetic-client/kinetic-client.0.0.11/opam
@@ -14,7 +14,7 @@ build: [
 depends: [
   "ocaml" {>= "4.04"}
   "dune" {>= "1.1.0"}
-  "ocaml-protoc" {>= "1.2.0"}
+  "ocaml-protoc" {>= "1.2.0" & < "3.0.0"}
   "lwt" {>= "3.2.0"}
   "lwt_log"
   "lwt_ssl"
diff --git a/packages/ocaml-protoc/ocaml-protoc.3.0.0/opam b/packages/ocaml-protoc/ocaml-protoc.3.0.0/opam
new file mode 100644
index 00000000000..edc389f0243
--- /dev/null
+++ b/packages/ocaml-protoc/ocaml-protoc.3.0.0/opam
@@ -0,0 +1,41 @@
+opam-version: "2.0"
+synopsis: "Pure OCaml compiler for .proto files"
+maintainer: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+authors: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+license: "MIT"
+tags: ["protoc" "protobuf" "codegen"]
+homepage: "https://github.com/mransan/ocaml-protoc"
+bug-reports: "https://github.com/mransan/ocaml-protoc/issues"
+depends: [
+  "dune" {>= "2.0"}
+  "odoc" {with-doc}
+  "pbrt" {= version}
+  "pbrt_yojson" {= version & with-test}
+  "pbrt_services" {= version & with-test}
+  "ocaml" {>= "4.08"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+available: arch != "arm32" & arch != "x86_32" & arch != "ppc32" & arch != "ppc64"
+dev-repo: "git+https://github.com/mransan/ocaml-protoc.git"
+url {
+  src:
+    "https://github.com/mransan/ocaml-protoc/releases/download/v3.0.0/ocaml-protoc-3.0.0.tbz"
+  checksum: [
+    "sha256=923b651cf0f400b5ee2fd1d05798a408b4c0a378aab655e4c2618bcce3fd7bff"
+    "sha512=5a1c80115e111f3d4e9384feb9a1a49375d06b11538cdfd388cb4d8a2cb1bb7ae6201d0555daf970be40a017cbb30819e7bec9875a418f5f316b0115999827df"
+  ]
+}
+x-commit-hash: "6f4bea038088774722ce17421758832c06b19890"
diff --git a/packages/opentelemetry/opentelemetry.0.2/opam b/packages/opentelemetry/opentelemetry.0.2/opam
index 6d45e2d583c..d8bfa258f99 100644
--- a/packages/opentelemetry/opentelemetry.0.2/opam
+++ b/packages/opentelemetry/opentelemetry.0.2/opam
@@ -13,8 +13,8 @@ depends: [
   "ocaml" {>= "4.08"}
   "ptime"
   "odoc" {with-doc}
-  "ocaml-protoc" {>= "2.2"}
-  "pbrt" {>= "2.2"}
+  "ocaml-protoc" {>= "2.2" & < "3.0.0"}
+  "pbrt" {>= "2.2" & < "3.0.0"}
 ]
 build: [
   ["dune" "subst"] {dev}
diff --git a/packages/opentelemetry/opentelemetry.0.3/opam b/packages/opentelemetry/opentelemetry.0.3/opam
index 7547ba0c4d0..a6e557a751c 100644
--- a/packages/opentelemetry/opentelemetry.0.3/opam
+++ b/packages/opentelemetry/opentelemetry.0.3/opam
@@ -13,8 +13,8 @@ depends: [
   "ocaml" {>= "4.08"}
   "ptime"
   "odoc" {with-doc}
-  "ocaml-protoc" {>= "2.2"}
-  "pbrt" {>= "2.2"}
+  "ocaml-protoc" {>= "2.2" & < "3.0.0"}
+  "pbrt" {>= "2.2" & < "3.0.0"}
 ]
 build: [
   ["dune" "subst"] {dev}
diff --git a/packages/opentelemetry/opentelemetry.0.4/opam b/packages/opentelemetry/opentelemetry.0.4/opam
index 05557e4ce80..797f90618a0 100644
--- a/packages/opentelemetry/opentelemetry.0.4/opam
+++ b/packages/opentelemetry/opentelemetry.0.4/opam
@@ -12,7 +12,7 @@ depends: [
   "ocaml" {>= "4.08"}
   "ptime"
   "odoc" {with-doc}
-  "pbrt" {>= "2.3"}
+  "pbrt" {>= "2.3" & < "3.0.0"}
 ]
 build: [
   ["dune" "subst"] {dev}
diff --git a/packages/opentelemetry/opentelemetry.0.5/opam b/packages/opentelemetry/opentelemetry.0.5/opam
index ccc0bed37ae..e213bac9a0f 100644
--- a/packages/opentelemetry/opentelemetry.0.5/opam
+++ b/packages/opentelemetry/opentelemetry.0.5/opam
@@ -11,7 +11,7 @@ depends: [
   "ocaml" {>= "4.08"}
   "ptime"
   "odoc" {with-doc}
-  "pbrt" {>= "2.3"}
+  "pbrt" {>= "2.3" & < "3.0.0"}
 ]
 depopts: [
   "trace"
diff --git a/packages/opentelemetry/opentelemetry.0.6/opam b/packages/opentelemetry/opentelemetry.0.6/opam
index c10222f3f63..23743784cdc 100644
--- a/packages/opentelemetry/opentelemetry.0.6/opam
+++ b/packages/opentelemetry/opentelemetry.0.6/opam
@@ -19,7 +19,7 @@ depends: [
   "alcotest" {with-test}
   "opentelemetry-client-cohttp-lwt" {with-test & = version}
   "opentelemetry-client-ocurl" {with-test & = version}
-  "pbrt" {>= "2.3"}
+  "pbrt" {>= "2.3" & < "3.0.0"}
   "ocaml-lsp-server" {with-dev-setup}
   "ocamlformat" {with-dev-setup & >= "0.24" & < "0.25"}
 ]
diff --git a/packages/pbrt/pbrt.3.0.0/opam b/packages/pbrt/pbrt.3.0.0/opam
new file mode 100644
index 00000000000..fe38bdfaeec
--- /dev/null
+++ b/packages/pbrt/pbrt.3.0.0/opam
@@ -0,0 +1,38 @@
+opam-version: "2.0"
+synopsis: "Runtime library for Protobuf tooling"
+maintainer: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+authors: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+license: "MIT"
+tags: ["protobuf" "encode" "decode"]
+homepage: "https://github.com/mransan/ocaml-protoc"
+bug-reports: "https://github.com/mransan/ocaml-protoc/issues"
+depends: [
+  "dune" {>= "2.0"}
+  "stdlib-shims"
+  "odoc" {with-doc}
+  "ocaml" {>= "4.08"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/mransan/ocaml-protoc.git"
+url {
+  src:
+    "https://github.com/mransan/ocaml-protoc/releases/download/v3.0.0/ocaml-protoc-3.0.0.tbz"
+  checksum: [
+    "sha256=923b651cf0f400b5ee2fd1d05798a408b4c0a378aab655e4c2618bcce3fd7bff"
+    "sha512=5a1c80115e111f3d4e9384feb9a1a49375d06b11538cdfd388cb4d8a2cb1bb7ae6201d0555daf970be40a017cbb30819e7bec9875a418f5f316b0115999827df"
+  ]
+}
+x-commit-hash: "6f4bea038088774722ce17421758832c06b19890"
diff --git a/packages/pbrt_services/pbrt_services.3.0.0/opam b/packages/pbrt_services/pbrt_services.3.0.0/opam
new file mode 100644
index 00000000000..6dab5f085ab
--- /dev/null
+++ b/packages/pbrt_services/pbrt_services.3.0.0/opam
@@ -0,0 +1,38 @@
+opam-version: "2.0"
+synopsis: "Runtime library for ocaml-protoc to support RPC services"
+maintainer: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+authors: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+license: "MIT"
+tags: ["protobuf" "encode" "decode" "services" "rpc"]
+homepage: "https://github.com/mransan/ocaml-protoc"
+bug-reports: "https://github.com/mransan/ocaml-protoc/issues"
+depends: [
+  "dune" {>= "2.0"}
+  "ocaml" {>= "4.08"}
+  "pbrt" {= version}
+  "pbrt_yojson" {= version}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/mransan/ocaml-protoc.git"
+url {
+  src:
+    "https://github.com/mransan/ocaml-protoc/releases/download/v3.0.0/ocaml-protoc-3.0.0.tbz"
+  checksum: [
+    "sha256=923b651cf0f400b5ee2fd1d05798a408b4c0a378aab655e4c2618bcce3fd7bff"
+    "sha512=5a1c80115e111f3d4e9384feb9a1a49375d06b11538cdfd388cb4d8a2cb1bb7ae6201d0555daf970be40a017cbb30819e7bec9875a418f5f316b0115999827df"
+  ]
+}
+x-commit-hash: "6f4bea038088774722ce17421758832c06b19890"
diff --git a/packages/pbrt_yojson/pbrt_yojson.3.0.0/opam b/packages/pbrt_yojson/pbrt_yojson.3.0.0/opam
new file mode 100644
index 00000000000..d1bb82a7cd2
--- /dev/null
+++ b/packages/pbrt_yojson/pbrt_yojson.3.0.0/opam
@@ -0,0 +1,40 @@
+opam-version: "2.0"
+synopsis:
+  "Runtime library for ocaml-protoc to support JSON encoding/decoding"
+maintainer: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+authors: ["Maxime Ransan <maxime.ransan@gmail.com>" "Simon Cruanes"]
+license: "MIT"
+tags: ["protobuf" "encode" "decode"]
+homepage: "https://github.com/mransan/ocaml-protoc"
+bug-reports: "https://github.com/mransan/ocaml-protoc/issues"
+depends: [
+  "dune" {>= "2.0"}
+  "ocaml" {>= "4.08"}
+  "odoc" {with-doc}
+  "yojson" {>= "1.6"}
+  "base64" {>= "3.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/mransan/ocaml-protoc.git"
+url {
+  src:
+    "https://github.com/mransan/ocaml-protoc/releases/download/v3.0.0/ocaml-protoc-3.0.0.tbz"
+  checksum: [
+    "sha256=923b651cf0f400b5ee2fd1d05798a408b4c0a378aab655e4c2618bcce3fd7bff"
+    "sha512=5a1c80115e111f3d4e9384feb9a1a49375d06b11538cdfd388cb4d8a2cb1bb7ae6201d0555daf970be40a017cbb30819e7bec9875a418f5f316b0115999827df"
+  ]
+}
+x-commit-hash: "6f4bea038088774722ce17421758832c06b19890"