diff --git a/src/utils.ts b/src/utils.ts
index 9cbf594..3876c6a 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -28,8 +28,10 @@ export function addExtension(path: string, ext: string): string {
 }
 
 const FILE_VERSION_READERS = {
-  "package.json": (content: string) =>
-    JSON.parse(content).packageManager?.split("bun@")?.[1],
+  "package.json": (content: string) => {
+    const pkg = JSON.parse(content);
+    return pkg.packageManager?.split("bun@")?.[1] ?? pkg.engines?.bun;
+  },
   ".tool-versions": (content: string) =>
     content.match(/^bun\s*(?<version>.*?)$/m)?.groups?.version,
   ".bumrc": (content: string) => content, // https://github.com/owenizedd/bum