diff --git a/functions/src/scripts/denormalize.ts b/functions/src/scripts/denormalize.ts
index d4feb425..3362e940 100644
--- a/functions/src/scripts/denormalize.ts
+++ b/functions/src/scripts/denormalize.ts
@@ -3,7 +3,6 @@
 
 import { DocumentSnapshot, Transaction } from 'firebase-admin/firestore'
 import { isEqual, zip } from 'lodash'
-import { UpdateSpec } from '../utils'
 
 export type DocumentValue = {
   doc: DocumentSnapshot
@@ -54,7 +53,7 @@ export function getDiffUpdate(diff: DocumentDiff) {
   return {
     doc: diff.dest.doc.ref,
     fields: Object.fromEntries(zip(diff.dest.fields, diff.src.vals)),
-  } as UpdateSpec
+  }
 }
 
 export function applyDiff(transaction: Transaction, diff: DocumentDiff) {
diff --git a/functions/src/utils.ts b/functions/src/utils.ts
index efc22e53..91f4b293 100644
--- a/functions/src/utils.ts
+++ b/functions/src/utils.ts
@@ -47,7 +47,7 @@ export const writeAsync = async (
     const batch = db.batch()
     for (const { doc, fields } of chunks[i]) {
       if (operationType === 'update') {
-        batch.update(doc, fields)
+        batch.update(doc, fields as any)
       } else {
         batch.set(doc, fields)
       }