diff --git a/vendors/ocplib-json-typed/ocplib-json-typed-browser.opam b/vendors/ocplib-json-typed/ocplib-json-typed-browser.opam
index c8c14c33b..6f24eeb2b 100644
--- a/vendors/ocplib-json-typed/ocplib-json-typed-browser.opam
+++ b/vendors/ocplib-json-typed/ocplib-json-typed-browser.opam
@@ -7,9 +7,11 @@ homepage: "https://github.com/ocamlpro/ocplib-json-typed"
 bug-reports: "https://github.com/ocamlpro/ocplib-json-typed/issues"
 license: "LGPLv3 w/ linking exception"
 dev-repo: "git+https://github.com/ocamlpro/ocplib-json-typed.git"
+
 build: [ "dune" "build" "-j" jobs "-p" name "@install" ]
 run-test: [ "dune" "runtest" "-p" name "-j" jobs ]
 depends: [
+  "ocaml" {>= "4.3.0"}
   "dune" {build & >= "1.0.1"}
   "ocplib-json-typed" {= "0.6" }
   "js_of_ocaml" {>= "3.3.0"}
diff --git a/vendors/ocplib-json-typed/ocplib-json-typed-bson.opam b/vendors/ocplib-json-typed/ocplib-json-typed-bson.opam
index c9d257b3a..b169506e8 100644
--- a/vendors/ocplib-json-typed/ocplib-json-typed-bson.opam
+++ b/vendors/ocplib-json-typed/ocplib-json-typed-bson.opam
@@ -7,9 +7,11 @@ homepage: "https://github.com/ocamlpro/ocplib-json-typed"
 bug-reports: "https://github.com/ocamlpro/ocplib-json-typed/issues"
 license: "LGPLv3 w/ linking exception"
 dev-repo: "git+https://github.com/ocamlpro/ocplib-json-typed.git"
+
 build: [ "dune" "build" "-j" jobs "-p" name "@install" ]
 run-test: [ "dune" "runtest" "-p" name "-j" jobs ]
 depends: [
+  "ocaml" {>= "4.3.0"}
   "dune" {build & >= "1.0.1"}
   "ocplib-json-typed" {= "0.6" }
   "ocplib-endian" {>= "1.0"}
diff --git a/vendors/ocplib-json-typed/ocplib-json-typed.opam b/vendors/ocplib-json-typed/ocplib-json-typed.opam
index ef269e679..08b7830f6 100644
--- a/vendors/ocplib-json-typed/ocplib-json-typed.opam
+++ b/vendors/ocplib-json-typed/ocplib-json-typed.opam
@@ -7,9 +7,11 @@ homepage: "https://github.com/ocamlpro/ocplib-json-typed"
 bug-reports: "https://github.com/ocamlpro/ocplib-json-typed/issues"
 license: "LGPLv3 w/ linking exception"
 dev-repo: "git+https://github.com/ocamlpro/ocplib-json-typed.git"
+
 build: [ "dune" "build" "-j" jobs "-p" name "@install" ]
 run-test: [ "dune" "runtest" "-p" name "-j" jobs ]
 depends: [
+  "ocaml" {>= "4.3.0"}
   "dune" {build & >= "1.0.1"}
   "uri" {>= "1.9.0" }
 ]