diff --git a/packages/browser/src/client.ts b/packages/browser/src/client.ts
index 851f830d6955..9209426b744f 100644
--- a/packages/browser/src/client.ts
+++ b/packages/browser/src/client.ts
@@ -122,7 +122,6 @@ export class BrowserClient extends BaseClient<BrowserClientOptions> {
     const envelope = createUserFeedbackEnvelope(feedback, {
       metadata: this.getSdkMetadata(),
       dsn: this.getDsn(),
-      tunnel: this.getOptions().tunnel,
     });
 
     // sendEnvelope should not throw
diff --git a/packages/browser/src/userfeedback.ts b/packages/browser/src/userfeedback.ts
index c2c8b0a116fc..5fa80e499fbf 100644
--- a/packages/browser/src/userfeedback.ts
+++ b/packages/browser/src/userfeedback.ts
@@ -12,7 +12,7 @@ export function createUserFeedbackEnvelope(
     dsn,
   }: {
     metadata: SdkMetadata | undefined;
-    tunnel: string | undefined;
+    tunnel?: string | undefined;
     dsn: DsnComponents | undefined;
   },
 ): EventEnvelope {
diff --git a/packages/core/src/baseclient.ts b/packages/core/src/baseclient.ts
index db79df0d1c16..a2fe9f33c58a 100644
--- a/packages/core/src/baseclient.ts
+++ b/packages/core/src/baseclient.ts
@@ -141,11 +141,10 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
     if (this._dsn) {
       const url = getEnvelopeEndpointWithUrlEncodedAuth(
         this._dsn,
-        options.tunnel,
+        undefined,
         options._metadata ? options._metadata.sdk : undefined,
       );
       this._transport = options.transport({
-        tunnel: this._options.tunnel,
         recordDroppedEvent: this.recordDroppedEvent.bind(this),
         ...options.transportOptions,
         url,
@@ -353,7 +352,7 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
   public sendEvent(event: Event, hint: EventHint = {}): void {
     this.emit('beforeSendEvent', event, hint);
 
-    let env = createEventEnvelope(event, this._dsn, this._options._metadata, this._options.tunnel);
+    let env = createEventEnvelope(event, this._dsn, this._options._metadata);
 
     for (const attachment of hint.attachments || []) {
       env = addItemToEnvelope(env, createAttachmentEnvelopeItem(attachment));
@@ -369,7 +368,7 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
    * @inheritDoc
    */
   public sendSession(session: Session | SessionAggregates): void {
-    const env = createSessionEnvelope(session, this._dsn, this._options._metadata, this._options.tunnel);
+    const env = createSessionEnvelope(session, this._dsn, this._options._metadata);
 
     // sendEnvelope should not throw
     // eslint-disable-next-line @typescript-eslint/no-floating-promises
@@ -915,7 +914,7 @@ export abstract class BaseClient<O extends ClientOptions> implements Client<O> {
 
     DEBUG_BUILD && logger.log('Sending outcomes:', outcomes);
 
-    const envelope = createClientReportEnvelope(outcomes, this._options.tunnel && dsnToString(this._dsn));
+    const envelope = createClientReportEnvelope(outcomes);
 
     // sendEnvelope should not throw
     // eslint-disable-next-line @typescript-eslint/no-floating-promises
diff --git a/packages/core/src/envelope.ts b/packages/core/src/envelope.ts
index efe55ab685ac..4d8c91af599f 100644
--- a/packages/core/src/envelope.ts
+++ b/packages/core/src/envelope.ts
@@ -111,13 +111,9 @@ export function createSpanEnvelope(spans: [SentrySpan, ...SentrySpan[]], client?
   // different segments in one envelope
   const dsc = getDynamicSamplingContextFromSpan(spans[0]);
 
-  const dsn = client && client.getDsn();
-  const tunnel = client && client.getOptions().tunnel;
-
   const headers: SpanEnvelope[0] = {
     sent_at: new Date().toISOString(),
     ...(dscHasRequiredProps(dsc) && { trace: dsc }),
-    ...(!!tunnel && dsn && { dsn: dsnToString(dsn) }),
   };
 
   const beforeSendSpan = client && client.getOptions().beforeSendSpan;
diff --git a/packages/core/src/metrics/envelope.ts b/packages/core/src/metrics/envelope.ts
index f3bd67b27ec6..d59a79547c62 100644
--- a/packages/core/src/metrics/envelope.ts
+++ b/packages/core/src/metrics/envelope.ts
@@ -9,9 +9,8 @@ export function captureAggregateMetrics(client: Client, metricBucketItems: Array
   logger.log(`Flushing aggregated metrics, number of metrics: ${metricBucketItems.length}`);
   const dsn = client.getDsn();
   const metadata = client.getSdkMetadata();
-  const tunnel = client.getOptions().tunnel;
 
-  const metricsEnvelope = createMetricEnvelope(metricBucketItems, dsn, metadata, tunnel);
+  const metricsEnvelope = createMetricEnvelope(metricBucketItems, dsn, metadata);
 
   // sendEnvelope should not throw
   // eslint-disable-next-line @typescript-eslint/no-floating-promises
diff --git a/packages/core/src/transports/multiplexed.ts b/packages/core/src/transports/multiplexed.ts
index 6b58637025dd..6fde1ce62463 100644
--- a/packages/core/src/transports/multiplexed.ts
+++ b/packages/core/src/transports/multiplexed.ts
@@ -106,7 +106,7 @@ export function makeMultiplexedTransport<TO extends BaseTransportOptions>(
         if (!validatedDsn) {
           return undefined;
         }
-        const url = getEnvelopeEndpointWithUrlEncodedAuth(validatedDsn, options.tunnel);
+        const url = getEnvelopeEndpointWithUrlEncodedAuth(validatedDsn);
 
         transport = release
           ? makeOverrideReleaseTransport(createTransport, release)({ ...options, url })
diff --git a/packages/core/src/utils/isSentryRequestUrl.ts b/packages/core/src/utils/isSentryRequestUrl.ts
index a3f3e08be3e0..b1586654aee0 100644
--- a/packages/core/src/utils/isSentryRequestUrl.ts
+++ b/packages/core/src/utils/isSentryRequestUrl.ts
@@ -7,22 +7,9 @@ import type { Client, DsnComponents } from '@sentry/types';
  */
 export function isSentryRequestUrl(url: string, client: Client | undefined): boolean {
   const dsn = client && client.getDsn();
-  const tunnel = client && client.getOptions().tunnel;
-  return checkDsn(url, dsn) || checkTunnel(url, tunnel);
-}
-
-function checkTunnel(url: string, tunnel: string | undefined): boolean {
-  if (!tunnel) {
-    return false;
-  }
-
-  return removeTrailingSlash(url) === removeTrailingSlash(tunnel);
+  return checkDsn(url, dsn);
 }
 
 function checkDsn(url: string, dsn: DsnComponents | undefined): boolean {
   return dsn ? url.includes(dsn.host) : false;
 }
-
-function removeTrailingSlash(str: string): string {
-  return str[str.length - 1] === '/' ? str.slice(0, -1) : str;
-}