diff --git a/action.yml b/action.yml
index dc1e7a3..49bf257 100644
--- a/action.yml
+++ b/action.yml
@@ -23,7 +23,7 @@ inputs:
   source-pr:
     description: The PR of `magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
-    default: 1
+    default: 3
   source-revision:
     description: The revision of `nix-magic-nix-cache` to use. Conflicts with all other `source-*` options.
     required: false
diff --git a/bun.lockb b/bun.lockb
index 5f50faf..f3e6291 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/dist/index.js b/dist/index.js
index 4256df1..9fe91b1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -12181,10 +12181,12 @@ async function setUpAutoCache() {
     else {
         runEnv = process.env;
     }
-    const outputPath = `${daemonDir}/parent.log`;
+    // Start the server. Once it is ready, it will notify us via file descriptor 3.
+    const outputPath = `${daemonDir}/daemon.log`;
     const output = openSync(outputPath, 'a');
-    const launch = spawn(daemonBin, [
-        '--daemon-dir', daemonDir,
+    const notifyFd = 3;
+    const daemon = spawn(daemonBin, [
+        '--notify-fd', String(notifyFd),
         '--listen', coreExports.getInput('listen'),
         '--upstream', coreExports.getInput('upstream-cache'),
         '--diagnostic-endpoint', coreExports.getInput('diagnostic-endpoint'),
@@ -12197,13 +12199,20 @@ async function setUpAutoCache() {
     ] : []).concat(coreExports.getInput('use-gha-cache') === 'true' ? [
         '--use-gha-cache'
     ] : []), {
-        stdio: ['ignore', output, output],
-        env: runEnv
+        stdio: ['ignore', output, output, 'pipe'],
+        env: runEnv,
+        detached: true
     });
+    const pidFile = path$1.join(daemonDir, 'daemon.pid');
+    await fs$2.writeFile(pidFile, `${daemon.pid}`);
     await new Promise((resolve, reject) => {
-        launch.on('exit', async (code, signal) => {
+        daemon.stdio[notifyFd].on('data', (data) => {
+            if (data.toString().trim() == 'INIT') {
+                resolve();
+            }
+        });
+        daemon.on('exit', async (code, signal) => {
             const log = await fs$2.readFile(outputPath, 'utf-8');
-            console.log(log);
             if (signal) {
                 reject(new Error(`Daemon was killed by signal ${signal}: ${log}`));
             }
@@ -12211,10 +12220,11 @@ async function setUpAutoCache() {
                 reject(new Error(`Daemon exited with code ${code}: ${log}`));
             }
             else {
-                resolve();
+                reject(new Error(`Daemon unexpectedly exited: ${log}`));
             }
         });
     });
+    daemon.unref();
     coreExports.info('Launched Magic Nix Cache');
     coreExports.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);
 }
diff --git a/src/index.ts b/src/index.ts
index 406f927..79ade61 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -113,12 +113,14 @@ async function setUpAutoCache() {
     runEnv = process.env;
   }
 
-  const outputPath = `${daemonDir}/parent.log`;
+  // Start the server. Once it is ready, it will notify us via file descriptor 3.
+  const outputPath = `${daemonDir}/daemon.log`;
   const output = openSync(outputPath, 'a');
-  const launch = spawn(
+  const notifyFd = 3;
+  const daemon = spawn(
     daemonBin,
     [
-      '--daemon-dir', daemonDir,
+      '--notify-fd', String(notifyFd),
       '--listen', core.getInput('listen'),
       '--upstream', core.getInput('upstream-cache'),
       '--diagnostic-endpoint', core.getInput('diagnostic-endpoint'),
@@ -134,25 +136,36 @@ async function setUpAutoCache() {
           '--use-gha-cache'
         ] : []),
     {
-      stdio: ['ignore', output, output],
-      env: runEnv
+      stdio: ['ignore', output, output, 'pipe'],
+      env: runEnv,
+      detached: true
     }
   );
 
+  const pidFile = path.join(daemonDir, 'daemon.pid');
+  await fs.writeFile(pidFile, `${daemon.pid}`);
+
   await new Promise<void>((resolve, reject) => {
-    launch.on('exit', async (code, signal) => {
+    daemon.stdio[notifyFd].on('data', (data) => {
+      if (data.toString().trim() == 'INIT') {
+        resolve();
+      }
+    });
+
+    daemon.on('exit', async (code, signal) => {
       const log: string = await fs.readFile(outputPath, 'utf-8');
-      console.log(log);
       if (signal) {
         reject(new Error(`Daemon was killed by signal ${signal}: ${log}`));
       } else if (code) {
         reject(new Error(`Daemon exited with code ${code}: ${log}`));
       } else {
-        resolve();
+        reject(new Error(`Daemon unexpectedly exited: ${log}`));
       }
     });
   });
 
+  daemon.unref();
+
   core.info('Launched Magic Nix Cache');
   core.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);
 }