diff --git a/packages/cli/package.json b/packages/cli/package.json
index b2e0b44db..7ddfc6674 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@openrouter/spawn",
-  "version": "1.0.43",
+  "version": "1.0.44",
   "type": "module",
   "bin": {
     "spawn": "cli.js"
diff --git a/packages/cli/src/index.ts b/packages/cli/src/index.ts
index 7fcfabe87..8c423d5e2 100644
--- a/packages/cli/src/index.ts
+++ b/packages/cli/src/index.ts
@@ -964,7 +964,7 @@ async function main(): Promise<void> {
   }
   // --fast implies all beta features
   if (process.env.SPAWN_FAST === "1") {
-    betaFeatures.push("tarball", "images", "parallel", "docker");
+    betaFeatures.push("tarball", "images", "parallel", "docker", "sandbox");
   }
 
   // fast_provision experiment: if the user did NOT pass --beta or --fast,