diff --git a/packages/libbinaryen/libbinaryen.123.0.0/opam b/packages/libbinaryen/libbinaryen.123.0.0/opam
new file mode 100644
index 00000000000..9f05a66da33
--- /dev/null
+++ b/packages/libbinaryen/libbinaryen.123.0.0/opam
@@ -0,0 +1,29 @@
+opam-version: "2.0"
+synopsis: "Libbinaryen packaged for OCaml"
+maintainer: "blaine@grain-lang.org"
+authors: "Blaine Bublitz"
+license: "Apache-2.0"
+homepage: "https://github.com/grain-lang/libbinaryen"
+bug-reports: "https://github.com/grain-lang/libbinaryen/issues"
+depends: [
+  "conf-cmake" {build}
+  "dune" {>= "3.0.0"}
+  "dune-configurator" {>= "3.0.0"}
+  "js_of_ocaml-compiler" {with-test & >= "4.1.0" & < "7.0.0"}
+  "ocaml" {>= "4.13"}
+]
+build: [
+  ["dune" "subst"] {dev}
+  ["dune" "build" "-p" name "-j" jobs]
+]
+depexts: ["gcc-g++"] {os-distribution = "cygwinports"}
+dev-repo: "git+https://github.com/grain-lang/libbinaryen.git"
+url {
+  src:
+    "https://github.com/grain-lang/libbinaryen/releases/download/v123.0.0/libbinaryen-v123.0.0.tar.gz"
+  checksum: [
+    "md5=96e0736fc40db8c99e128dcbcbc56c37"
+    "sha512=9132f497c948e47e320c3046362ab77fd3b97d76b4ebfd7f8110588f3bbb6ba04852a56507585279abcfee556dbfa789af54d814e57e0a2096bb88a0f08a13b0"
+  ]
+}
+x-maintenance-intent: ["(latest)"]
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