diff --git a/dune-project b/dune-project
index f431941f..8263cbe6 100644
--- a/dune-project
+++ b/dune-project
@@ -173,7 +173,8 @@
   (opentelemetry
    (= :version))
   (odoc :with-doc)
-  cohttp-eio
+  (cohttp-eio
+   (>= 6.1.0))
   eio_main
   (alcotest :with-test))
  (synopsis "Collector client for opentelemetry, using cohttp + eio"))
diff --git a/opentelemetry-client-cohttp-eio.opam b/opentelemetry-client-cohttp-eio.opam
index 7bf13158..434de85b 100644
--- a/opentelemetry-client-cohttp-eio.opam
+++ b/opentelemetry-client-cohttp-eio.opam
@@ -17,7 +17,7 @@ depends: [
   "mtime" {>= "1.4"}
   "opentelemetry" {= version}
   "odoc" {with-doc}
-  "cohttp-eio"
+  "cohttp-eio" {>= "6.1.0"}
   "eio_main"
   "alcotest" {with-test}
 ]