diff --git a/packages/opam-spin/opam-spin.0.8.3/opam b/packages/opam-spin/opam-spin.0.8.3/opam
new file mode 100644
index 00000000000..463d51106c8
--- /dev/null
+++ b/packages/opam-spin/opam-spin.0.8.3/opam
@@ -0,0 +1,40 @@
+opam-version: "2.0"
+synopsis: "Opam plugin for Spin, the OCaml project generator"
+description: "Opam plugin for Spin, the OCaml project generator"
+maintainer: ["Thibaut Mattio"]
+authors: ["Thibaut Mattio"]
+license: "ISC"
+homepage: "https://github.com/tmattio/spin"
+doc: "https://tmattio.github.io/spin/"
+bug-reports: "https://github.com/tmattio/spin/issues"
+depends: [
+  "ocaml" {>= "4.10.0"}
+  "dune" {>= "2.8"}
+  "spin" {= version}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/tmattio/spin.git"
+flags: plugin
+url {
+  src:
+    "https://github.com/tmattio/spin/releases/download/0.8.3/opam-spin-0.8.3.tbz"
+  checksum: [
+    "sha256=eeef9d3b89cca796d8d47ba425cee131bf14b5b0f1349927c4d8b22297b1f6b6"
+    "sha512=1850cad87f180b37e658e716986f6aa0ba76e57d6638d40b8f6e8ae2c6f60deee82218464e02356632022b394f49cc5a341e7255112aef455ffec9ca2db4cc32"
+  ]
+}
+x-commit-hash: "7fc6742bcdff20f41ae7f04be35706652c6a225b"
diff --git a/packages/spin/spin.0.8.3/opam b/packages/spin/spin.0.8.3/opam
new file mode 100644
index 00000000000..b83a539e18f
--- /dev/null
+++ b/packages/spin/spin.0.8.3/opam
@@ -0,0 +1,51 @@
+opam-version: "2.0"
+synopsis: "OCaml project generator"
+description: "OCaml project generator"
+maintainer: ["Thibaut Mattio"]
+authors: ["Thibaut Mattio"]
+license: "ISC"
+homepage: "https://github.com/tmattio/spin"
+doc: "https://tmattio.github.io/spin/"
+bug-reports: "https://github.com/tmattio/spin/issues"
+depends: [
+  "ocaml" {>= "4.10.0"}
+  "dune" {>= "2.8"}
+  "alcotest" {with-test}
+  "js_of_ocaml" {with-test}
+  "js_of_ocaml-ppx" {with-test}
+  "ppxlib" {with-test}
+  "ctypes" {with-test}
+  "odoc" {with-doc}
+  "crunch" {build}
+  "sexplib" {>= "v0.13"}
+  "spawn" {>= "v0.13"}
+  "jingoo" {>= "1.4.0"}
+  "fmt" {>= "0.8.9"}
+  "fpath"
+  "cmdliner"
+  "logs"
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/tmattio/spin.git"
+url {
+  src:
+    "https://github.com/tmattio/spin/releases/download/0.8.3/opam-spin-0.8.3.tbz"
+  checksum: [
+    "sha256=eeef9d3b89cca796d8d47ba425cee131bf14b5b0f1349927c4d8b22297b1f6b6"
+    "sha512=1850cad87f180b37e658e716986f6aa0ba76e57d6638d40b8f6e8ae2c6f60deee82218464e02356632022b394f49cc5a341e7255112aef455ffec9ca2db4cc32"
+  ]
+}
+x-commit-hash: "7fc6742bcdff20f41ae7f04be35706652c6a225b"