diff --git a/packages/binaryen/binaryen.0.35.0/opam b/packages/binaryen/binaryen.0.35.0/opam
new file mode 100644
index 000000000000..5242e344ae81
--- /dev/null
+++ b/packages/binaryen/binaryen.0.35.0/opam
@@ -0,0 +1,28 @@
+opam-version: "2.0"
+synopsis: "OCaml bindings for Binaryen"
+maintainer: "oscar@grain-lang.org"
+authors: "Oscar Spencer"
+license: " Apache-2.0"
+homepage: "https://github.com/grain-lang/binaryen.ml"
+bug-reports: "https://github.com/grain-lang/binaryen.ml/issues"
+depends: [
+  "ocaml" {>= "4.13.0"}
+  "dune" {>= "3.0.0"}
+  "dune-configurator" {>= "3.0.0"}
+  "js_of_ocaml-compiler" {>= "6.0.0" & < "7.0.0"}
+  "libbinaryen" {>= "125.0.0" & < "126.0.0"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+dev-repo: "git+https://github.com/grain-lang/binaryen.ml.git"
+url {
+  src:
+    "https://github.com/grain-lang/binaryen.ml/releases/download/v0.35.0/binaryen-archive-v0.35.0.tar.gz"
+  checksum: [
+    "md5=60d798c5efaaedffcee94634f7d68518"
+    "sha512=bec9e0e4616f5712e7a206d6861d2a07296d08cca176e06bd37f7fc427838fb315d2adcb72ff3ee4715c89c0dae09521168ab5af7186e135e70f04d9395f30f7"
+  ]
+}
+x-maintenance-intent: ["0.(latest)"]
\ No newline at end of file