diff --git a/src/adapter/admin/transaction.mjs b/src/adapter/admin/transaction.mjs
index a6f2b3f..c63cbf5 100644
--- a/src/adapter/admin/transaction.mjs
+++ b/src/adapter/admin/transaction.mjs
@@ -18,7 +18,7 @@ export const transaction = (db, options) => {
   return {
     read: (readCallback) => {
       return {
-        write: (writeCallback) =>
+        write: async (writeCallback) =>
           db[firestoreSymbol]().runTransaction(async (firebaseTransaction) => {
             const readResult = await readCallback(
               transactionReadHelpers(db, firebaseTransaction),
diff --git a/src/adapter/web/transaction.mjs b/src/adapter/web/transaction.mjs
index 5c464ce..f435c44 100644
--- a/src/adapter/web/transaction.mjs
+++ b/src/adapter/web/transaction.mjs
@@ -19,7 +19,7 @@ export const transaction = (db, options) => {
   return {
     read: (readCallback) => {
       return {
-        write: (writeCallback) =>
+        write: async (writeCallback) =>
           runTransaction(db[firestoreSymbol](), async (firebaseTransaction) => {
             const readResult = await readCallback(
               transactionReadHelpers(db, firebaseTransaction),
diff --git a/src/types/transaction.ts b/src/types/transaction.ts
index 9e29419..325dc6f 100644
--- a/src/types/transaction.ts
+++ b/src/types/transaction.ts
@@ -255,7 +255,7 @@ export namespace TypesaurusTransaction {
   > {
     write: <WriteResult>(
       callback: WriteFunction<Schema, ReadResult, WriteResult, Props>,
-    ) => WriteDocsToDocs<WriteResult, Props>;
+    ) => Promise<WriteDocsToDocs<WriteResult, Props>>;
   }
 
   /**