diff --git a/packages/browser/test/unit/index.test.ts b/packages/browser/test/unit/index.test.ts
index e97046c3eb65..2aae1410d438 100644
--- a/packages/browser/test/unit/index.test.ts
+++ b/packages/browser/test/unit/index.test.ts
@@ -7,7 +7,6 @@ import {
 } from '@sentry/core';
 import * as utils from '@sentry/utils';
 
-import type { Event } from '../../src';
 import { setCurrentClient } from '../../src';
 import {
   BrowserClient,
@@ -213,7 +212,7 @@ describe('SentryBrowser', () => {
 
     it('should capture a message', done => {
       const options = getDefaultBrowserClientOptions({
-        beforeSend: (event: Event): Event | null => {
+        beforeSend: event => {
           expect(event.message).toBe('test');
           expect(event.exception).toBeUndefined();
           done();
@@ -227,7 +226,7 @@ describe('SentryBrowser', () => {
 
     it('should capture an event', done => {
       const options = getDefaultBrowserClientOptions({
-        beforeSend: (event: Event): Event | null => {
+        beforeSend: event => {
           expect(event.message).toBe('event');
           expect(event.exception).toBeUndefined();
           done();
@@ -241,7 +240,7 @@ describe('SentryBrowser', () => {
 
     it('should set `platform` on events', done => {
       const options = getDefaultBrowserClientOptions({
-        beforeSend: (event: Event): Event | null => {
+        beforeSend: event => {
           expect(event.platform).toBe('javascript');
           done();
           return event;
diff --git a/packages/core/test/lib/base.test.ts b/packages/core/test/lib/base.test.ts
index 0f789e2da169..373c2d6424cc 100644
--- a/packages/core/test/lib/base.test.ts
+++ b/packages/core/test/lib/base.test.ts
@@ -1,4 +1,4 @@
-import type { Client, Envelope, Event } from '@sentry/types';
+import type { Client, Envelope, ErrorEvent, Event, TransactionEvent } from '@sentry/types';
 import { SentryError, SyncPromise, dsnToString, logger } from '@sentry/utils';
 
 import { Scope, addBreadcrumb, getCurrentScope, getIsolationScope, makeSession, setCurrentClient } from '../../src';
@@ -1065,7 +1065,7 @@ describe('BaseClient', () => {
 
       const beforeSend = jest.fn(
         async event =>
-          new Promise<Event>(resolve => {
+          new Promise<ErrorEvent>(resolve => {
             setTimeout(() => {
               resolve(event);
             }, 1);
@@ -1095,7 +1095,7 @@ describe('BaseClient', () => {
 
       const beforeSendTransaction = jest.fn(
         async event =>
-          new Promise<Event>(resolve => {
+          new Promise<TransactionEvent>(resolve => {
             setTimeout(() => {
               resolve(event);
             }, 1);
@@ -1125,7 +1125,7 @@ describe('BaseClient', () => {
 
       const beforeSend = jest.fn(async event => {
         event.message = 'changed2';
-        return new Promise<Event>(resolve => {
+        return new Promise<ErrorEvent>(resolve => {
           setTimeout(() => {
             resolve(event);
           }, 1);
@@ -1155,7 +1155,7 @@ describe('BaseClient', () => {
 
       const beforeSendTransaction = jest.fn(async event => {
         event.transaction = '/adopt/dont/shop';
-        return new Promise<Event>(resolve => {
+        return new Promise<TransactionEvent>(resolve => {
           setTimeout(() => {
             resolve(event);
           }, 1);
diff --git a/packages/types/src/options.ts b/packages/types/src/options.ts
index 3f8c55e84949..c9c95140902d 100644
--- a/packages/types/src/options.ts
+++ b/packages/types/src/options.ts
@@ -1,5 +1,5 @@
 import type { Breadcrumb, BreadcrumbHint } from './breadcrumb';
-import type { ErrorEvent, Event, EventHint, TransactionEvent } from './event';
+import type { ErrorEvent, EventHint, TransactionEvent } from './event';
 import type { Integration } from './integration';
 import type { CaptureContext } from './scope';
 import type { SdkMetadata } from './sdkmetadata';
@@ -255,7 +255,6 @@ export interface ClientOptions<TO extends BaseTransportOptions = BaseTransportOp
    */
   tracesSampler?: (samplingContext: SamplingContext) => number | boolean;
 
-  // TODO (v8): Narrow the response type to `ErrorEvent` - this is technically a breaking change.
   /**
    * An event-processing callback for error and message events, guaranteed to be invoked after all other event
    * processors, which allows an event to be modified or dropped.
@@ -267,9 +266,8 @@ export interface ClientOptions<TO extends BaseTransportOptions = BaseTransportOp
    * @param hint Event metadata useful for processing.
    * @returns A new event that will be sent | null.
    */
-  beforeSend?: (event: ErrorEvent, hint: EventHint) => PromiseLike<Event | null> | Event | null;
+  beforeSend?: (event: ErrorEvent, hint: EventHint) => PromiseLike<ErrorEvent | null> | ErrorEvent | null;
 
-  // TODO (v8): Narrow the response type to `TransactionEvent` - this is technically a breaking change.
   /**
    * An event-processing callback for transaction events, guaranteed to be invoked after all other event
    * processors. This allows an event to be modified or dropped before it's sent.
@@ -281,7 +279,10 @@ export interface ClientOptions<TO extends BaseTransportOptions = BaseTransportOp
    * @param hint Event metadata useful for processing.
    * @returns A new event that will be sent | null.
    */
-  beforeSendTransaction?: (event: TransactionEvent, hint: EventHint) => PromiseLike<Event | null> | Event | null;
+  beforeSendTransaction?: (
+    event: TransactionEvent,
+    hint: EventHint,
+  ) => PromiseLike<TransactionEvent | null> | TransactionEvent | null;
 
   /**
    * A callback invoked when adding a breadcrumb, allowing to optionally modify