diff --git a/packages/aws-cdk/lib/api/aws-auth/sdk.ts b/packages/aws-cdk/lib/api/aws-auth/sdk.ts
index 6a78965620c01..3e76b2c1016e2 100644
--- a/packages/aws-cdk/lib/api/aws-auth/sdk.ts
+++ b/packages/aws-cdk/lib/api/aws-auth/sdk.ts
@@ -1,3 +1,4 @@
+import * as region_info from '@aws-cdk/region-info';
 import * as AWS from 'aws-sdk';
 import type { ConfigurationOptions } from 'aws-sdk/lib/config-base';
 import { debug, trace } from './_env';
@@ -6,21 +7,6 @@ import { cached } from './cached';
 import { Account } from './sdk-provider';
 import { traceMethods } from '../../util/tracing';
 
-// We need to map regions to domain suffixes, and the SDK already has a function to do this.
-// It's not part of the public API, but it's also unlikely to go away.
-//
-// Reuse that function, and add a safety check, so we don't accidentally break if they ever
-// refactor that away.
-
-/* eslint-disable @typescript-eslint/no-require-imports */
-const regionUtil = require('aws-sdk/lib/region_config');
-require('aws-sdk/lib/maintenance_mode_message').suppress = true;
-/* eslint-enable @typescript-eslint/no-require-imports */
-
-if (!regionUtil.getEndpointSuffix) {
-  throw new Error('This version of AWS SDK for JS does not have the \'getEndpointSuffix\' function!');
-}
-
 export interface ISDK {
   /**
    * The region this SDK has been instantiated for
@@ -291,7 +277,11 @@ export class SDK implements ISDK {
   }
 
   public getEndpointSuffix(region: string): string {
-    return regionUtil.getEndpointSuffix(region);
+    const suffix = region_info.RegionInfo.get(region).domainSuffix;
+    if (!suffix) {
+      throw new Error(`Could not find domainSuffix in RegionInfo for ${region}`);
+    }
+    return suffix;
   }
 
   /**
diff --git a/packages/aws-cdk/test/api/logs/logs-monitor.test.ts b/packages/aws-cdk/test/api/logs/logs-monitor.test.ts
index 5d35455b0c846..3d073c1626b56 100644
--- a/packages/aws-cdk/test/api/logs/logs-monitor.test.ts
+++ b/packages/aws-cdk/test/api/logs/logs-monitor.test.ts
@@ -44,8 +44,8 @@ test('process events', async () => {
 
   // THEN
   const expectedLocaleTimeString = eventDate.toLocaleTimeString();
-  expect(stderrMock).toHaveBeenCalledTimes(1);
-  expect(stderrMock.mock.calls[0][0]).toContain(
+  expect(stderrMock).toHaveBeenCalledTimes(2);
+  expect(stderrMock.mock.calls[1][0]).toContain(
     `[${blue('loggroup')}] ${yellow(expectedLocaleTimeString)} message`,
   );
 });