diff --git a/auto-update.ts b/auto-update.ts
index fd583ca..841dc73 100644
--- a/auto-update.ts
+++ b/auto-update.ts
@@ -1,6 +1,7 @@
 import * as fs from "fs";
 import * as path from "path";
 import * as os from "os";
+import { spawn } from "child_process";
 import type { PluginInput } from "@opencode-ai/plugin";
 
 const PACKAGE_NAME = "opencode-session-handoff";
@@ -204,16 +205,19 @@ function invalidatePackage(): boolean {
 
 async function runBunInstall(): Promise<boolean> {
   try {
-    const proc = Bun.spawn(["bun", "install"], {
+    const proc = spawn("bun", ["install"], {
       cwd: getConfigDir(),
-      stdout: "pipe",
-      stderr: "pipe",
+      stdio: "pipe",
+    });
+
+    const exitPromise = new Promise<number | null>((resolve) => {
+      proc.on("close", (code) => resolve(code));
+      proc.on("error", () => resolve(null));
     });
 
     const timeoutPromise = new Promise<"timeout">((resolve) =>
       setTimeout(() => resolve("timeout"), BUN_INSTALL_TIMEOUT_MS),
     );
-    const exitPromise = proc.exited.then(() => "completed" as const);
 
     const result = await Promise.race([exitPromise, timeoutPromise]);
 
@@ -226,7 +230,7 @@ async function runBunInstall(): Promise<boolean> {
       return false;
     }
 
-    return proc.exitCode === 0;
+    return result === 0;
   } catch {
     return false;
   }
diff --git a/package.json b/package.json
index df05c66..a0541a5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "opencode-session-handoff",
-  "version": "1.1.0",
+  "version": "1.1.6",
   "description": "OpenCode plugin for seamless session continuation when context windows fill up",
   "keywords": [
     "context-window",