diff --git a/meta/cobalt_core_tests.cmx b/meta/cobalt_core_tests.cmx
index 1e930e8..261b7be 100644
--- a/meta/cobalt_core_tests.cmx
+++ b/meta/cobalt_core_tests.cmx
@@ -4,7 +4,7 @@
   },
   "sandbox": {
     "features": [
-      "system-temp",
+      "isolated-temp",
       "deprecated-ambient-replace-as-executable"
     ]
   }