diff --git a/packages/captp/package.json b/packages/captp/package.json
index 00602cdb1a4..35cda199bdd 100644
--- a/packages/captp/package.json
+++ b/packages/captp/package.json
@@ -39,7 +39,7 @@
   },
   "dependencies": {
     "@agoric/eventual-send": "^0.12.0-dev.0",
-    "@agoric/marshal": "^0.2.7-dev.0",
+    "@agoric/marshal": "^0.5.0",
     "@agoric/nat": "^2.0.1",
     "@agoric/promise-kit": "^0.1.7-dev.0",
     "esm": "^3.2.5"