diff --git a/upack.json b/upack.json
index bff15da..feea07a 100644
--- a/upack.json
+++ b/upack.json
@@ -3,8 +3,8 @@
     "version": "v1alpha1",
     "description": "test pack",
     "engines": {
-        "build": "tester:v1",
-        "deploy": "tester:v1"
+        "build": "alpine:3",
+        "deploy": "alpine:3"
     },
     "build_steps": [
         "./build1.sh", "./build2.sh"