diff --git a/dune-project b/dune-project
index b1a84c72..91e27d51 100644
--- a/dune-project
+++ b/dune-project
@@ -101,7 +101,9 @@
   (lwt
    (>= "5.3"))
   (cohttp-lwt
-   (>= "4.0.0"))
+   (and
+    (>= "4.0.0")
+    (< "6")))
   (alcotest :with-test))
  (synopsis "Opentelemetry tracing for Cohttp HTTP servers"))
 
diff --git a/opentelemetry-cohttp-lwt.opam b/opentelemetry-cohttp-lwt.opam
index 0cd9bb22..0a1490ca 100644
--- a/opentelemetry-cohttp-lwt.opam
+++ b/opentelemetry-cohttp-lwt.opam
@@ -18,7 +18,7 @@ depends: [
   "opentelemetry-lwt" {= version}
   "odoc" {with-doc}
   "lwt" {>= "5.3"}
-  "cohttp-lwt" {>= "4.0.0"}
+  "cohttp-lwt" {>= "4.0.0" & < "6"}
   "alcotest" {with-test}
 ]
 build: [