diff --git a/packages/graphql-cohttp/graphql-cohttp.0.9.0/opam b/packages/graphql-cohttp/graphql-cohttp.0.9.0/opam
index 12baf3a0c1d..c1e01dbef69 100644
--- a/packages/graphql-cohttp/graphql-cohttp.0.9.0/opam
+++ b/packages/graphql-cohttp/graphql-cohttp.0.9.0/opam
@@ -15,7 +15,7 @@ depends: [
   "ocaml" {>= "4.03.0"}
   "dune"
   "graphql" {>= "0.9.0"}
-  "cohttp" {>= "2.0.0"}
+  "cohttp" {>= "2.0.0" & < "6.0.0~~"}
   "crunch"
   "astring" {>= "0.8.3"}
   "base64" {>= "3.0.0"}