diff --git a/packages/SwingSet/package.json b/packages/SwingSet/package.json
index 46a1b1f06ed..967f30457cf 100644
--- a/packages/SwingSet/package.json
+++ b/packages/SwingSet/package.json
@@ -21,6 +21,7 @@
     "lint:eslint": "eslint '**/*.js'"
   },
   "devDependencies": {
+    "@agoric/vat-data": "^0.1.0",
     "@endo/ses-ava": "^0.2.21",
     "@types/tmp": "^0.2.0",
     "ava": "^3.12.1",
@@ -34,7 +35,6 @@
     "@agoric/store": "^0.6.10",
     "@agoric/swing-store": "^0.6.5",
     "@agoric/xsnap": "^0.11.2",
-    "@agoric/vat-data": "^0.1.0",
     "@endo/base64": "^0.2.21",
     "@endo/bundle-source": "^2.1.1",
     "@endo/captp": "^2.0.3",