diff --git a/packages/generator/src/fileCreators/prisma-idb-client/classes/models/IDBModelClass.ts b/packages/generator/src/fileCreators/prisma-idb-client/classes/models/IDBModelClass.ts
index e90f299..5511ce0 100644
--- a/packages/generator/src/fileCreators/prisma-idb-client/classes/models/IDBModelClass.ts
+++ b/packages/generator/src/fileCreators/prisma-idb-client/classes/models/IDBModelClass.ts
@@ -4,27 +4,28 @@ import { addCountMethod } from "./api/count";
 import { addCreateMethod } from "./api/create";
 import { addCreateManyMethod } from "./api/createMany";
 import { addCreateManyAndReturn } from "./api/createManyAndReturn";
+import { addDeleteMethod } from "./api/delete";
+import { addDeleteManyMethod } from "./api/deleteMany";
 import { addFindFirstMethod } from "./api/findFirst";
 import { addFindFirstOrThrow } from "./api/findFirstOrThrow";
 import { addFindManyMethod } from "./api/findMany";
 import { addFindUniqueMethod } from "./api/findUnique";
 import { addFindUniqueOrThrow } from "./api/findUniqueOrThrow";
 import { addUpdateMethod } from "./api/update";
+import { addUpdateMany } from "./api/updateMany";
+import { addUpsertMethod } from "./api/upsert";
+import { addApplyOrderByClause } from "./utils/_applyOrderByClause";
 import { addApplyRelations } from "./utils/_applyRelations";
 import { addApplySelectClause } from "./utils/_applySelectClause";
 import { addApplyWhereClause } from "./utils/_applyWhereClause";
 import { addFillDefaultsFunction } from "./utils/_fillDefaults";
 import { addGetNeededStoresForCreate } from "./utils/_getNeededStoresForCreate";
 import { addGetNeededStoresForFind } from "./utils/_getNeededStoresForFind";
-import { addRemoveNestedCreateDataMethod } from "./utils/_removeNestedCreateData";
 import { addGetNeededStoresForWhere } from "./utils/_getNeededStoresForWhere";
-import { addDeleteMethod } from "./api/delete";
-import { addDeleteManyMethod } from "./api/deleteMany";
-import { addApplyOrderByClause } from "./utils/_applyOrderByClause";
+import { addPreprocessListFields } from "./utils/_preprocessListFields";
+import { addRemoveNestedCreateDataMethod } from "./utils/_removeNestedCreateData";
 import { addResolveOrderByKey } from "./utils/_resolveOrderByKey";
 import { addResolveSortOrder } from "./utils/_resolveSortOrder";
-import { addPreprocessListFields } from "./utils/_preprocessListFields";
-import { addUpsertMethod } from "./api/upsert";
 
 export function addIDBModelClass(file: SourceFile, model: Model, models: readonly Model[]) {
   const modelClass = file.addClass({
@@ -60,5 +61,6 @@ export function addIDBModelClass(file: SourceFile, model: Model, models: readonl
   addDeleteManyMethod(modelClass, model, models);
 
   addUpdateMethod(modelClass, model);
+  addUpdateMany(modelClass, model);
   addUpsertMethod(modelClass, model);
 }
diff --git a/packages/generator/src/fileCreators/prisma-idb-client/classes/models/api/updateMany.ts b/packages/generator/src/fileCreators/prisma-idb-client/classes/models/api/updateMany.ts
new file mode 100644
index 0000000..10b81d7
--- /dev/null
+++ b/packages/generator/src/fileCreators/prisma-idb-client/classes/models/api/updateMany.ts
@@ -0,0 +1,39 @@
+import { getUniqueIdentifiers } from "../../../../../helpers/utils";
+import { Model } from "../../../../../fileCreators/types";
+import { ClassDeclaration } from "ts-morph";
+
+export function addUpdateMany(modelClass: ClassDeclaration, model: Model) {
+  modelClass.addMethod({
+    name: "updateMany",
+    isAsync: true,
+    typeParameters: [{ name: "Q", constraint: `Prisma.Args<Prisma.${model.name}Delegate, "updateMany">` }],
+    parameters: [
+      { name: "query", type: "Q" },
+      {
+        name: "tx",
+        hasQuestionToken: true,
+        type: "IDBUtils.ReadwriteTransactionType",
+      },
+    ],
+    returnType: `Promise<Prisma.Result<Prisma.${model.name}Delegate, Q, "updateMany">>`,
+    statements: (writer) => {
+      // TODO: composite keys
+      const pk = JSON.parse(getUniqueIdentifiers(model)[0].keyPath) as string[];
+      writer
+        // TODO: nested create stores as well
+        .writeLine(
+          `tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");`,
+        )
+        .writeLine(`const records = await this.findMany({ where: query.where }, tx);`)
+        .writeLine(`await Promise.all(`)
+        .writeLine(`records.map(async (record) =>`)
+        .block(() => {
+          writer.writeLine(
+            `await this.update({ where: { ${pk.map((field) => `${field}: record.${field},`)} }, data: query.data }, tx);`,
+          );
+        })
+        .writeLine(`));`)
+        .writeLine(`return { count: records.length };`);
+    },
+  });
+}
diff --git a/packages/usage/src/prisma/prisma-idb/prisma-idb-client.ts b/packages/usage/src/prisma/prisma-idb/prisma-idb-client.ts
index e1b84d4..8d00c94 100644
--- a/packages/usage/src/prisma/prisma-idb/prisma-idb-client.ts
+++ b/packages/usage/src/prisma/prisma-idb/prisma-idb-client.ts
@@ -797,6 +797,20 @@ class UserIDBClass extends BaseIDBModelClass {
     return recordWithRelations as Prisma.Result<Prisma.UserDelegate, Q, "update">;
   }
 
+  async updateMany<Q extends Prisma.Args<Prisma.UserDelegate, "updateMany">>(
+    query: Q,
+    tx?: IDBUtils.ReadwriteTransactionType,
+  ): Promise<Prisma.Result<Prisma.UserDelegate, Q, "updateMany">> {
+    tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");
+    const records = await this.findMany({ where: query.where }, tx);
+    await Promise.all(
+      records.map(async (record) => {
+        await this.update({ where: { id: record.id }, data: query.data }, tx);
+      }),
+    );
+    return { count: records.length };
+  }
+
   async upsert<Q extends Prisma.Args<Prisma.UserDelegate, "upsert">>(
     query: Q,
     tx?: IDBUtils.ReadwriteTransactionType,
@@ -1283,6 +1297,20 @@ class ProfileIDBClass extends BaseIDBModelClass {
     return recordWithRelations as Prisma.Result<Prisma.ProfileDelegate, Q, "update">;
   }
 
+  async updateMany<Q extends Prisma.Args<Prisma.ProfileDelegate, "updateMany">>(
+    query: Q,
+    tx?: IDBUtils.ReadwriteTransactionType,
+  ): Promise<Prisma.Result<Prisma.ProfileDelegate, Q, "updateMany">> {
+    tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");
+    const records = await this.findMany({ where: query.where }, tx);
+    await Promise.all(
+      records.map(async (record) => {
+        await this.update({ where: { id: record.id }, data: query.data }, tx);
+      }),
+    );
+    return { count: records.length };
+  }
+
   async upsert<Q extends Prisma.Args<Prisma.ProfileDelegate, "upsert">>(
     query: Q,
     tx?: IDBUtils.ReadwriteTransactionType,
@@ -1946,6 +1974,20 @@ class PostIDBClass extends BaseIDBModelClass {
     return recordWithRelations as Prisma.Result<Prisma.PostDelegate, Q, "update">;
   }
 
+  async updateMany<Q extends Prisma.Args<Prisma.PostDelegate, "updateMany">>(
+    query: Q,
+    tx?: IDBUtils.ReadwriteTransactionType,
+  ): Promise<Prisma.Result<Prisma.PostDelegate, Q, "updateMany">> {
+    tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");
+    const records = await this.findMany({ where: query.where }, tx);
+    await Promise.all(
+      records.map(async (record) => {
+        await this.update({ where: { id: record.id }, data: query.data }, tx);
+      }),
+    );
+    return { count: records.length };
+  }
+
   async upsert<Q extends Prisma.Args<Prisma.PostDelegate, "upsert">>(
     query: Q,
     tx?: IDBUtils.ReadwriteTransactionType,
@@ -2529,6 +2571,20 @@ class CommentIDBClass extends BaseIDBModelClass {
     return recordWithRelations as Prisma.Result<Prisma.CommentDelegate, Q, "update">;
   }
 
+  async updateMany<Q extends Prisma.Args<Prisma.CommentDelegate, "updateMany">>(
+    query: Q,
+    tx?: IDBUtils.ReadwriteTransactionType,
+  ): Promise<Prisma.Result<Prisma.CommentDelegate, Q, "updateMany">> {
+    tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");
+    const records = await this.findMany({ where: query.where }, tx);
+    await Promise.all(
+      records.map(async (record) => {
+        await this.update({ where: { id: record.id }, data: query.data }, tx);
+      }),
+    );
+    return { count: records.length };
+  }
+
   async upsert<Q extends Prisma.Args<Prisma.CommentDelegate, "upsert">>(
     query: Q,
     tx?: IDBUtils.ReadwriteTransactionType,
@@ -3077,6 +3133,20 @@ class AllFieldScalarTypesIDBClass extends BaseIDBModelClass {
     return recordWithRelations as Prisma.Result<Prisma.AllFieldScalarTypesDelegate, Q, "update">;
   }
 
+  async updateMany<Q extends Prisma.Args<Prisma.AllFieldScalarTypesDelegate, "updateMany">>(
+    query: Q,
+    tx?: IDBUtils.ReadwriteTransactionType,
+  ): Promise<Prisma.Result<Prisma.AllFieldScalarTypesDelegate, Q, "updateMany">> {
+    tx = tx ?? this.client._db.transaction(Array.from(this._getNeededStoresForFind(query)), "readwrite");
+    const records = await this.findMany({ where: query.where }, tx);
+    await Promise.all(
+      records.map(async (record) => {
+        await this.update({ where: { id: record.id }, data: query.data }, tx);
+      }),
+    );
+    return { count: records.length };
+  }
+
   async upsert<Q extends Prisma.Args<Prisma.AllFieldScalarTypesDelegate, "upsert">>(
     query: Q,
     tx?: IDBUtils.ReadwriteTransactionType,
diff --git a/packages/usage/tests/modelQueries/updateMany.spec.ts b/packages/usage/tests/modelQueries/updateMany.spec.ts
new file mode 100644
index 0000000..228a2ca
--- /dev/null
+++ b/packages/usage/tests/modelQueries/updateMany.spec.ts
@@ -0,0 +1,24 @@
+import { test } from "../fixtures";
+import { expectQueryToSucceed } from "../queryRunnerHelper";
+
+test("updateMany_ChangeNames_SuccessfullyUpdatesRecord", async ({ page }) => {
+  await expectQueryToSucceed({
+    page,
+    model: "user",
+    operation: "createMany",
+    query: { data: [{ name: "John" }, { name: "Alice" }, { name: "Clark" }] },
+  });
+
+  await expectQueryToSucceed({
+    page,
+    model: "user",
+    operation: "updateMany",
+    query: { where: { name: { contains: "c", mode: "insensitive" } }, data: { name: "ALICE" } },
+  });
+
+  await expectQueryToSucceed({
+    page,
+    model: "user",
+    operation: "findMany",
+  });
+});