diff --git a/packages/melange-webapi/melange-webapi.0.21.0/opam b/packages/melange-webapi/melange-webapi.0.21.0/opam
index 0c72f1dda697..41a6c841b7da 100644
--- a/packages/melange-webapi/melange-webapi.0.21.0/opam
+++ b/packages/melange-webapi/melange-webapi.0.21.0/opam
@@ -12,7 +12,7 @@ bug-reports: "https://github.com/melange-community/melange-webapi/issues"
 depends: [
   "dune" {>= "3.8"}
   "ocaml"
-  "melange" {>= "2.0.0"}
+  "melange" {>= "2.0.0" & < "6.0.0"}
   "melange-fetch"
   "reason" {>= "3.10"}
   "ocaml-lsp-server" {with-test}
diff --git a/packages/melange/melange.6.0.1-414/opam b/packages/melange/melange.6.0.1-414/opam
new file mode 100644
index 000000000000..c086472aef0c
--- /dev/null
+++ b/packages/melange/melange.6.0.1-414/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Toolchain to produce JS from Reason/OCaml"
+maintainer: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+authors: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+license: "LGPL-2.1-or-later"
+homepage: "https://github.com/melange-re/melange"
+bug-reports: "https://github.com/melange-re/melange/issues"
+depends: [
+  "dune" {>= "3.18"}
+  "ocaml" {>= "4.14" & < "4.15"}
+  "cmdliner" {>= "1.1.0"}
+  "dune-build-info"
+  "cppo" {build}
+  "ppxlib" {>= "0.36"}
+  "menhir" {>= "20201214"}
+  "odoc" {with-doc}
+]
+available: arch != "x86_32" & arch != "arm32"
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/melange-re/melange.git"
+x-maintenance-intent: ["(latest)"]
+url {
+  src:
+    "https://github.com/melange-re/melange/releases/download/6.0.1-414/melange-6.0.1-414.tbz"
+  checksum: [
+    "sha256=c1cce011864740dc43ee0f4e8130f70725f5e7042942cce653be5b6a8b439fb5"
+    "sha512=04fc82d97d5b9632c4ee041414d9fe104556a8c329e7444ffd71017baa00612da103fda91c309fc29a16e143c29d8748e1b1035a74681b61ff65fcfdf7f4e59c"
+  ]
+}
+x-commit-hash: "28109a0a976b48abf94c314602018a15a8a68858"
diff --git a/packages/melange/melange.6.0.1-51/opam b/packages/melange/melange.6.0.1-51/opam
new file mode 100644
index 000000000000..145c38b50405
--- /dev/null
+++ b/packages/melange/melange.6.0.1-51/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Toolchain to produce JS from Reason/OCaml"
+maintainer: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+authors: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+license: "LGPL-2.1-or-later"
+homepage: "https://github.com/melange-re/melange"
+bug-reports: "https://github.com/melange-re/melange/issues"
+depends: [
+  "dune" {>= "3.18"}
+  "ocaml" {>= "5.1" & < "5.2"}
+  "cmdliner" {>= "1.1.0"}
+  "dune-build-info"
+  "cppo" {build}
+  "ppxlib" {>= "0.36"}
+  "menhir" {>= "20201214"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@doc" {with-doc}
+  ]
+]
+available: arch != "x86_32" & arch != "arm32"
+dev-repo: "git+https://github.com/melange-re/melange.git"
+x-maintenance-intent: ["(latest)"]
+url {
+  src:
+    "https://github.com/melange-re/melange/releases/download/6.0.1-51/melange-6.0.1-51.tbz"
+  checksum: [
+    "sha256=e4b6d50504d2f83d2be366fa0f7f815176679efc6a3b32a97bc53b8efbc7476e"
+    "sha512=1079bbcd916793ba891b8322299d0f01db8cac144104c8d99dc420300c1e56dd27e2180b10026aec17e47690076afa4cdc60e23d847c0fd1ca28a675e0ef1933"
+  ]
+}
+x-commit-hash: "2189e4fee34ca70ff2d5bd144122b1ecbbd23216"
diff --git a/packages/melange/melange.6.0.1-52/opam b/packages/melange/melange.6.0.1-52/opam
new file mode 100644
index 000000000000..fbb45a28acd0
--- /dev/null
+++ b/packages/melange/melange.6.0.1-52/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Toolchain to produce JS from Reason/OCaml"
+maintainer: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+authors: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+license: "LGPL-2.1-or-later"
+homepage: "https://github.com/melange-re/melange"
+bug-reports: "https://github.com/melange-re/melange/issues"
+depends: [
+  "dune" {>= "3.18"}
+  "ocaml" {>= "5.2" & < "5.3"}
+  "cmdliner" {>= "1.1.0"}
+  "dune-build-info"
+  "cppo" {build}
+  "ppxlib" {>= "0.36"}
+  "menhir" {>= "20201214"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@doc" {with-doc}
+  ]
+]
+available: arch != "x86_32" & arch != "arm32"
+dev-repo: "git+https://github.com/melange-re/melange.git"
+x-maintenance-intent: ["(latest)"]
+url {
+  src:
+    "https://github.com/melange-re/melange/releases/download/6.0.1-52/melange-6.0.1-52.tbz"
+  checksum: [
+    "sha256=20123039b9009362857915da348376b637023eebe2e1152f8c619f352564e558"
+    "sha512=90d59d247691adcb6a9de74584db923cfb758b835466aa2230c907416d535acec39e34b76fb1ac00b4ee78ab8b56c8017cb4c5154e191db8ce15b54dcc84c545"
+  ]
+}
+x-commit-hash: "3babd012feba66bf133acc5ded3f320513844229"
diff --git a/packages/melange/melange.6.0.1-53/opam b/packages/melange/melange.6.0.1-53/opam
new file mode 100644
index 000000000000..076249a5e7fc
--- /dev/null
+++ b/packages/melange/melange.6.0.1-53/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Toolchain to produce JS from Reason/OCaml"
+maintainer: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+authors: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+license: "LGPL-2.1-or-later"
+homepage: "https://github.com/melange-re/melange"
+bug-reports: "https://github.com/melange-re/melange/issues"
+depends: [
+  "dune" {>= "3.18"}
+  "ocaml" {>= "5.3" & < "5.4"}
+  "cmdliner" {>= "1.1.0"}
+  "dune-build-info"
+  "cppo" {build}
+  "ppxlib" {>= "0.36"}
+  "menhir" {>= "20201214"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@doc" {with-doc}
+  ]
+]
+available: arch != "x86_32" & arch != "arm32"
+dev-repo: "git+https://github.com/melange-re/melange.git"
+x-maintenance-intent: ["(latest)"]
+url {
+  src:
+    "https://github.com/melange-re/melange/releases/download/6.0.1-53/melange-6.0.1-53.tbz"
+  checksum: [
+    "sha256=7b5fd122c16c29e01b736c2041fd4786d6be9f201722e10feee6ad5eb53d70bb"
+    "sha512=8c3099db5328f833d55b5447342cb6a059f002e2e977b897c48b2b08515addf304d5c54b4462f21a05d6947c43634cf3edb55cffef5d491441ae42585b47061d"
+  ]
+}
+x-commit-hash: "e298bf1f1979e170b7ef5828d9b288824c477227"
diff --git a/packages/melange/melange.6.0.1-54/opam b/packages/melange/melange.6.0.1-54/opam
new file mode 100644
index 000000000000..52e6b954f56f
--- /dev/null
+++ b/packages/melange/melange.6.0.1-54/opam
@@ -0,0 +1,42 @@
+opam-version: "2.0"
+synopsis: "Toolchain to produce JS from Reason/OCaml"
+maintainer: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+authors: ["Antonio Nuno Monteiro <anmonteiro@gmail.com>"]
+license: "LGPL-2.1-or-later"
+homepage: "https://github.com/melange-re/melange"
+bug-reports: "https://github.com/melange-re/melange/issues"
+depends: [
+  "dune" {>= "3.18"}
+  "ocaml" {>= "5.4" & < "5.5"}
+  "cmdliner" {>= "1.1.0"}
+  "dune-build-info"
+  "cppo" {build}
+  "ppxlib" {>= "0.36"}
+  "menhir" {>= "20201214"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@doc" {with-doc}
+  ]
+]
+available: arch != "x86_32" & arch != "arm32"
+dev-repo: "git+https://github.com/melange-re/melange.git"
+x-maintenance-intent: ["(latest)"]
+url {
+  src:
+    "https://github.com/melange-re/melange/releases/download/6.0.1-54/melange-6.0.1-54.tbz"
+  checksum: [
+    "sha256=6d5e530fcaa52edef041d9bd5b44f28430c1145a3f3dd2571a08ac727b011667"
+    "sha512=d18244080d0af70eca885bbc11357add73f5a3071c7dac241b7c78f7e451e0eea435aaa61aa87931a0f488c67e4c8d7b6945d0d41b50e506c1b6ab6fc6c4d1d4"
+  ]
+}
+x-commit-hash: "05511c3e6c3c2a792f36852a7f8c57a107c452c8"
diff --git a/packages/reason-react-ppx/reason-react-ppx.0.13.0/opam b/packages/reason-react-ppx/reason-react-ppx.0.13.0/opam
index 147167aa2196..01e4acd7529e 100644
--- a/packages/reason-react-ppx/reason-react-ppx.0.13.0/opam
+++ b/packages/reason-react-ppx/reason-react-ppx.0.13.0/opam
@@ -14,7 +14,7 @@ doc: "https://reasonml.github.io/reason-react"
 bug-reports: "https://github.com/reasonml/reason-react/issues"
 depends: [
   "dune" {>= "3.9"}
-  "melange" {>= "2.0.0"}
+  "melange" {>= "2.0.0" & < "6.0.0"}
   "ocaml" {>= "5.1.0"}
   "reason" {>= "3.10.0"}
   "ppxlib" {>= "0.28.0"}
diff --git a/packages/server-reason-react/server-reason-react.0.2.0/opam b/packages/server-reason-react/server-reason-react.0.2.0/opam
index fab45bd5ab6c..265e12766d85 100644
--- a/packages/server-reason-react/server-reason-react.0.2.0/opam
+++ b/packages/server-reason-react/server-reason-react.0.2.0/opam
@@ -9,7 +9,7 @@ depends: [
   "dune" {>= "3.9"}
   "ocaml" {>= "5.0.0"}
   "reason" {>= "3.10.0"}
-  "melange" {>= "3.0.0"}
+  "melange" {>= "3.0.0" & < "6.0.0"}
   "ppxlib" {> "0.23.0"}
   "quickjs" {= "0.1.1"}
   "promise" {>= "1.1.2"}
diff --git a/packages/server-reason-react/server-reason-react.0.3.0/opam b/packages/server-reason-react/server-reason-react.0.3.0/opam
index caa9926ca7e5..51f59f21fd02 100644
--- a/packages/server-reason-react/server-reason-react.0.3.0/opam
+++ b/packages/server-reason-react/server-reason-react.0.3.0/opam
@@ -9,7 +9,7 @@ depends: [
   "dune" {>= "3.9"}
   "ocaml" {>= "5.0.0"}
   "reason" {>= "3.10.0"}
-  "melange" {>= "3.0.0"}
+  "melange" {>= "3.0.0" & < "6.0.0"}
   "ppxlib" {> "0.23.0"}
   "quickjs" {>= "0.1.1" & < "0.1.2"}
   "promise" {>= "1.1.2"}
diff --git a/packages/server-reason-react/server-reason-react.0.3.1/opam b/packages/server-reason-react/server-reason-react.0.3.1/opam
index 0fcc4bd0ace6..16984b5d1752 100644
--- a/packages/server-reason-react/server-reason-react.0.3.1/opam
+++ b/packages/server-reason-react/server-reason-react.0.3.1/opam
@@ -9,9 +9,9 @@ depends: [
   "dune" {>= "3.9"}
   "ocaml" {>= "5.0.0"}
   "reason" {>= "3.10.0"}
-  "melange" {>= "3.0.0"}
+  "melange" {>= "3.0.0" & < "6.0.0"}
   "ppxlib" {> "0.23.0"}
-  "quickjs" {>= "0.1.2"}
+  "quickjs" {= "0.1.2"}
   "promise" {>= "1.1.2"}
   "lwt" {>= "5.6.0"}
   "lwt_ppx" {>= "2.1.0"}