diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0bda127a..f3077185 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,11 @@ and this project adheres to
 
 ## [unreleased]
 
+### Changed
+
+- Run brew update before set up to avoid an issue with Bintray transition
+  period.
+
 ## [1.1.9]
 
 ## Fixed
diff --git a/dist/index.js b/dist/index.js
index dd980cdd..950849a9 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -5080,17 +5080,20 @@ function acquireOpamDarwin(version, customRepository) {
             switch (_a.label) {
                 case 0:
                     repository = customRepository || "https://github.com/ocaml/opam-repository.git";
-                    return [4 /*yield*/, exec_1.exec("brew", ["install", "opam"])];
+                    return [4 /*yield*/, exec_1.exec("brew", ["update"])];
                 case 1:
                     _a.sent();
-                    return [4 /*yield*/, exec_1.exec("opam", ["init", "--bare", "-yav", repository])];
+                    return [4 /*yield*/, exec_1.exec("brew", ["install", "opam"])];
                 case 2:
                     _a.sent();
-                    return [4 /*yield*/, exec_1.exec(__nccwpck_require__.ab + "install-ocaml-unix.sh", [version])];
+                    return [4 /*yield*/, exec_1.exec("opam", ["init", "--bare", "-yav", repository])];
                 case 3:
                     _a.sent();
-                    return [4 /*yield*/, exec_1.exec("opam", ["install", "-y", "depext"])];
+                    return [4 /*yield*/, exec_1.exec(__nccwpck_require__.ab + "install-ocaml-unix.sh", [version])];
                 case 4:
+                    _a.sent();
+                    return [4 /*yield*/, exec_1.exec("opam", ["install", "-y", "depext"])];
+                case 5:
                     _a.sent();
                     return [2 /*return*/];
             }
diff --git a/src/installer.ts b/src/installer.ts
index 7960c247..5fff7b9b 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -85,6 +85,7 @@ async function acquireOpamDarwin(version: string, customRepository: string) {
   const repository =
     customRepository || "https://github.com/ocaml/opam-repository.git";
 
+  await exec("brew", ["update"]);
   await exec("brew", ["install", "opam"]);
   await exec("opam", ["init", "--bare", "-yav", repository]);
   await exec(path.join(__dirname, "install-ocaml-unix.sh"), [version]);