diff --git a/packages/miou/miou.0.3.1/opam b/packages/miou/miou.0.3.1/opam
new file mode 100644
index 00000000000..82485ab7e90
--- /dev/null
+++ b/packages/miou/miou.0.3.1/opam
@@ -0,0 +1,39 @@
+opam-version: "2.0"
+maintainer:   "Romain Calascibetta <romain.calascibetta@gmail.com>"
+authors:      "Romain Calascibetta <romain.calascibetta@gmail.com>"
+homepage:     "https://git.robur.coop/robur/miou"
+bug-reports:  "https://git.robur.coop/robur/miou/issues"
+dev-repo:     "git+https://github.com/robur-coop/miou.git"
+doc:          "https://docs.osau.re/miou/"
+license:      "MIT"
+synopsis:     "Composable concurrency primitives for OCaml"
+
+build: [ "dune" "build" "-p" name "-j" jobs ]
+run-test: [ "dune" "runtest" "-p" name "-j" jobs ]
+
+depends: [
+  "ocaml"             {>= "5.0.0"}
+  "dune"              {>= "2.8.0"}
+  "dscheck"           {with-test & >= "0.4.0"}
+  "digestif"          {with-test}
+  "happy-eyeballs"    {with-test & >= "0.6.0"}
+  "dns-client"        {with-test}
+  "hxd"               {with-test}
+  "mirage-crypto-rng" {with-test}
+  "ipaddr"            {with-test}
+  "logs"              {with-test & >= "0.7.0"}
+  "dns"               {with-test}
+  "dns-client"        {with-test}
+  "mtime"             {with-test & >= "2.0.0"}
+  "ocamlformat"       {with-dev-setup & = "0.27.0"}
+]
+x-maintenance-intent: [ "(latest)" ]
+url {
+  src:
+    "https://github.com/robur-coop/miou/releases/download/v0.3.1/miou-0.3.1.tbz"
+  checksum: [
+    "sha256=2b7a2d52ec0599156b6e7c586190cc99dd964d840799763f6f2407bb83e39471"
+    "sha512=eba70cb4c5484ef4c5fce522b106d32f20482fe55a9252c82cf7b85d69cd1359d97a9d7279f39c05f3b2365d87cdfec39fbe2a0780167506d1eaeaf618227895"
+  ]
+}
+x-commit-hash: "2f77245890e58272c5d54bfc311b02793a666295"