diff --git a/dune-project b/dune-project
index 42091a2..32c4d3a 100644
--- a/dune-project
+++ b/dune-project
@@ -34,6 +34,8 @@
  (depends
   (ocaml
    (>= 4.08))
+  (bigstringaf
+   (>= 0.9.1))
   (h2
    (>= 0.9.0))
   ppx_deriving
@@ -50,6 +52,8 @@
  (depends
   (grpc
    (= :version))
+  (h2
+   (>= 0.9.0))
   (lwt
    (>= 5.3.0))
   stringext))
@@ -68,6 +72,10 @@
    (>= v0.16))
   (grpc
    (= :version))
+  (h2
+   (>= 0.9.0))
+  (ppx_jane
+   (>= v0.16.0))
   stringext))
 
 (package
@@ -80,6 +88,8 @@
    (>= 0.12))
   (grpc
    (= :version))
+  (h2
+   (>= 0.9.0))
   stringext))
 
 (package
@@ -89,16 +99,28 @@
  (tags
   (network rpc serialisation))
  (depends
+  (async
+   (>= v0.16.0))
+  cohttp
+  cohttp-lwt
   cohttp-lwt-unix
   conduit-lwt-unix
+  (core
+   (>= v0.16.2))
+  (core_unix
+   (>= v0.16.0))
   (eio_main
    (>= 0.12))
   grpc-async
   grpc-eio
   grpc-lwt
+  (h2
+   (>= 0.9.0))
   h2-async
   h2-eio
   h2-lwt-unix
+  (lwt
+   (>= 5.3.0))
   (lwt_ssl
    (>= 1.2.0))
   (mdx
@@ -107,9 +129,14 @@
     :with-test))
   (ocaml-protoc-plugin
    (>= 4.5))
+  ppx_deriving
   ppx_deriving_yojson
+  (ppx_jane
+   (>= v0.16.0))
   stringext
-  tls-async))
+  tls-async
+  (uri
+   (>= 4.0.0))))
 
 (package
  (name grpc-bench)
diff --git a/grpc-async.opam b/grpc-async.opam
index d0da986..fd4a3b4 100644
--- a/grpc-async.opam
+++ b/grpc-async.opam
@@ -23,6 +23,8 @@ depends: [
   "ocaml" {>= "4.11"}
   "async" {>= "v0.16"}
   "grpc" {= version}
+  "h2" {>= "0.9.0"}
+  "ppx_jane" {>= "v0.16.0"}
   "stringext"
   "odoc" {with-doc}
 ]
diff --git a/grpc-eio.opam b/grpc-eio.opam
index 34eb00f..7f00944 100644
--- a/grpc-eio.opam
+++ b/grpc-eio.opam
@@ -20,6 +20,7 @@ depends: [
   "dune" {>= "3.7"}
   "eio" {>= "0.12"}
   "grpc" {= version}
+  "h2" {>= "0.9.0"}
   "stringext"
   "odoc" {with-doc}
 ]
diff --git a/grpc-examples.opam b/grpc-examples.opam
index cb260b3..0091766 100644
--- a/grpc-examples.opam
+++ b/grpc-examples.opam
@@ -19,21 +19,31 @@ doc: "https://dialohq.github.io/ocaml-grpc"
 bug-reports: "https://github.com/dialohq/ocaml-grpc/issues"
 depends: [
   "dune" {>= "3.7"}
+  "async" {>= "v0.16.0"}
+  "cohttp"
+  "cohttp-lwt"
   "cohttp-lwt-unix"
   "conduit-lwt-unix"
+  "core" {>= "v0.16.2"}
+  "core_unix" {>= "v0.16.0"}
   "eio_main" {>= "0.12"}
   "grpc-async"
   "grpc-eio"
   "grpc-lwt"
+  "h2" {>= "0.9.0"}
   "h2-async"
   "h2-eio"
   "h2-lwt-unix"
+  "lwt" {>= "5.3.0"}
   "lwt_ssl" {>= "1.2.0"}
   "mdx" {>= "2.2.1" & with-test}
   "ocaml-protoc-plugin" {>= "4.5"}
+  "ppx_deriving"
   "ppx_deriving_yojson"
+  "ppx_jane" {>= "v0.16.0"}
   "stringext"
   "tls-async"
+  "uri" {>= "4.0.0"}
   "odoc" {with-doc}
 ]
 build: [
diff --git a/grpc-lwt.opam b/grpc-lwt.opam
index 0a5d69e..e6797ef 100644
--- a/grpc-lwt.opam
+++ b/grpc-lwt.opam
@@ -20,6 +20,7 @@ bug-reports: "https://github.com/dialohq/ocaml-grpc/issues"
 depends: [
   "dune" {>= "3.7"}
   "grpc" {= version}
+  "h2" {>= "0.9.0"}
   "lwt" {>= "5.3.0"}
   "stringext"
   "odoc" {with-doc}
diff --git a/grpc.opam b/grpc.opam
index e3a8773..8355be4 100644
--- a/grpc.opam
+++ b/grpc.opam
@@ -21,6 +21,7 @@ bug-reports: "https://github.com/dialohq/ocaml-grpc/issues"
 depends: [
   "dune" {>= "3.7"}
   "ocaml" {>= "4.08"}
+  "bigstringaf" {>= "0.9.1"}
   "h2" {>= "0.9.0"}
   "ppx_deriving"
   "uri" {>= "4.0.0"}