diff --git a/ui/src/logic/useSystemUpdate.tsx b/ui/src/logic/useSystemUpdate.tsx
index 94bcdd1..e8834ac 100644
--- a/ui/src/logic/useSystemUpdate.tsx
+++ b/ui/src/logic/useSystemUpdate.tsx
@@ -1,27 +1,23 @@
-import { kilnBump, Vat } from '@urbit/api';
+import { kilnBump, Pike } from '@urbit/api';
 import { partition, pick } from 'lodash';
 import { useCallback } from 'react';
 import { useHistory } from 'react-router-dom';
 import api from '../state/api';
 import { useCharges } from '../state/docket';
-import useKilnState, { useVat } from '../state/kiln';
+import useKilnState, { usePike } from '../../state/kiln';
 
-export function vatIsBlocked(newKelvin: number | undefined, vat: Vat) {
-  if (!newKelvin) {
-    return false;
-  }
-
-  return !(vat.arak?.rail?.next || []).find(({ weft }) => weft.kelvin === newKelvin);
+function pikeIsBlocked(newKelvin: number, pike: Pike) {
+  return !pike.wefts?.find(({ kelvin }) => kelvin === newKelvin);
 }
 
 export function useSystemUpdate() {
   const { push } = useHistory();
-  const base = useVat('base');
+  const basePike = usePike('base');
   const update = base?.arak?.rail?.next?.[0];
-  const newKelvin = update?.weft?.kelvin;
+  const newKelvin = basePike?.wefts[0]?.kelvin ?? 418;
   const charges = useCharges();
   const [blocked] = useKilnState((s) => {
-    const [b, u] = partition(Object.entries(s.vats), ([, vat]) => vatIsBlocked(newKelvin, vat));
+    const [b, u] = partition(Object.entries(s.pikes), ([, pike]) => pikeIsBlocked(newKelvin, pike));
     return [b.map(([d]) => d), u.map(([d]) => d)] as const;
   });
 
diff --git a/ui/src/preferences/AppPrefs.tsx b/ui/src/preferences/AppPrefs.tsx
index 763d493..4df62d2 100644
--- a/ui/src/preferences/AppPrefs.tsx
+++ b/ui/src/preferences/AppPrefs.tsx
@@ -3,7 +3,7 @@ import { RouteComponentProps } from 'react-router-dom';
 import { Setting } from '../components/Setting';
 import { ShipName } from '../components/ShipName';
 import { useCharge } from '../state/docket';
-import useKilnState, { usePike, useVat } from '../../state/kiln';
+import useKilnState, { usePike } from '../../state/kiln';
 import { getAppName } from '../state/util';
 
 export const AppPrefs = ({ match }: RouteComponentProps<{ desk: string }>) => {