diff --git a/dune-project b/dune-project
index 93d60bb3..0ead41b2 100644
--- a/dune-project
+++ b/dune-project
@@ -18,7 +18,7 @@
    (ocaml (>= "4.08"))
    ptime
    (odoc :with-doc)
-   (ocaml-protoc (>= 2.1)))
+   (ocaml-protoc (>= 2.2)))
  (tags
   (instrumentation tracing opentelemetry datadog jaeger)))
 
@@ -40,7 +40,7 @@
    (mtime (>= "1.4")) ; for spans
    ; atomic ; vendored
    (opentelemetry (= :version))
-   (ocaml-protoc (>= 2.1))
+   (ocaml-protoc (>= 2.2))
    (odoc :with-doc)
    ocurl)
   (synopsis "Collector client for opentelemetry, using http + ocurl"))
diff --git a/opentelemetry-client-ocurl.opam b/opentelemetry-client-ocurl.opam
index f65d64ee..760071c6 100644
--- a/opentelemetry-client-ocurl.opam
+++ b/opentelemetry-client-ocurl.opam
@@ -13,7 +13,7 @@ depends: [
   "ocaml" {>= "4.08"}
   "mtime" {>= "1.4"}
   "opentelemetry" {= version}
-  "ocaml-protoc" {>= "2.1"}
+  "ocaml-protoc" {>= "2.2"}
   "odoc" {with-doc}
   "ocurl"
 ]
diff --git a/opentelemetry.opam b/opentelemetry.opam
index f02508d8..b4d44fc2 100644
--- a/opentelemetry.opam
+++ b/opentelemetry.opam
@@ -14,7 +14,7 @@ depends: [
   "ocaml" {>= "4.08"}
   "ptime"
   "odoc" {with-doc}
-  "ocaml-protoc" {>= "2.1"}
+  "ocaml-protoc" {>= "2.2"}
 ]
 build: [
   ["dune" "subst"] {dev}