diff --git a/bucket/opam.json b/bucket/opam.json
new file mode 100644
index 0000000000000..ded92f24ca29f
--- /dev/null
+++ b/bucket/opam.json
@@ -0,0 +1,23 @@
+{
+    "homepage": "https://opam.ocaml.org/",
+    "license": "LGPL-2.1-only",
+    "description": "opam is a source-based package manager for OCaml.",
+    "version": "2.2.1",
+    "architecture": {
+        "64bit": {
+            "url": "https://github.com/ocaml/opam/releases/download/2.2.1/opam-2.2.1-x86_64-windows.exe#/opam.exe",
+            "hash": "6AECD4DD221E2E283874652AA3577A9677CC417ECB79DAC8AAC9CEEE1B790FE1"
+        }
+    },
+    "bin": "opam.exe",
+    "checkver": {
+        "github": "https://github.com/ocaml/opam"
+    },
+    "autoupdate": {
+        "architecture": {
+            "64bit": {
+                "url": "https://github.com/ocaml/opam/releases/download/$version/opam-$version-x86_64-windows.exe#/opam.exe"
+            }
+        }
+    }
+}