diff --git a/CHANGELOG.md b/CHANGELOG.md
index a37182107..6717e2915 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased]
 ### Added
 - Updated `guides/index_lifecycle.md` to provide example of `ignore_unavailable: true` while deleting indices. ([665](https://github.com/opensearch-project/opensearch-js/pull/665))
+- Add expiration buffer to prevent credentials to expire earlier than request may finish in case AWS SDK v3 is used. ([678](https://github.com/opensearch-project/opensearch-js/pull/678))
 ### Dependencies
 - Bumps `@types/node` from 20.9.0 to 20.10.5
 - Bumps `eslint` from 8.54.0 to 8.56.0
diff --git a/USER_GUIDE.md b/USER_GUIDE.md
index b7c6793d0..7af770049 100644
--- a/USER_GUIDE.md
+++ b/USER_GUIDE.md
@@ -99,8 +99,8 @@ const client = new Client({
     // Must return a Promise that resolve to an AWS.Credentials object.
     // This function is used to acquire the credentials when the client start and
     // when the credentials are expired.
-    // The Client will refresh the Credentials only when they are expired.
-    // With AWS SDK V2, Credentials.refreshPromise is used when available to refresh the credentials.
+    // The Client will treat the Credentials as expired if within
+    // `requestTimeout` ms of expiration (default is 30000 ms).
 
     // Example with AWS SDK V3:
     getCredentials: () => {
@@ -109,6 +109,7 @@ const client = new Client({
       return credentialsProvider();
     },
   }),
+  requestTimeout: 60000, // Also used for refreshing credentials in advance
   node: 'https://search-xxx.region.es.amazonaws.com', // OpenSearch domain URL
   // node: "https://xxx.region.aoss.amazonaws.com" for OpenSearch Serverless
 });
diff --git a/lib/Transport.js b/lib/Transport.js
index 4406aeda6..f86f73c8f 100644
--- a/lib/Transport.js
+++ b/lib/Transport.js
@@ -729,4 +729,5 @@ module.exports.internals = {
   randomSelector,
   generateRequestId,
   lowerCaseHeaders,
+  toMs,
 };
diff --git a/lib/aws/AwsSigv4Signer.js b/lib/aws/AwsSigv4Signer.js
index d46ba351d..6b8eb83f0 100644
--- a/lib/aws/AwsSigv4Signer.js
+++ b/lib/aws/AwsSigv4Signer.js
@@ -14,6 +14,7 @@ const Transport = require('../Transport');
 const aws4 = require('aws4');
 const AwsSigv4SignerError = require('./errors');
 const crypto = require('crypto');
+const { toMs } = Transport.internals;
 
 const getAwsSDKCredentialsProvider = async () => {
   // First try V3
@@ -102,6 +103,12 @@ function AwsSigv4Signer(opts = {}) {
       }
 
       const currentCredentials = credentialsState.credentials;
+      /**
+       * For AWS SDK V3
+       * Make sure token will expire no earlier than `expiryBufferMs` milliseconds in the future.
+       */
+      const expiryBufferMs = toMs(options.requestTimeout || this.requestTimeout);
+
       let expired = false;
       if (!currentCredentials) {
         // Credentials haven't been acquired yet.
@@ -120,7 +127,10 @@ function AwsSigv4Signer(opts = {}) {
         expired = true;
       }
       // AWS SDK V3, Credentials.expiration is a Date object
-      else if (currentCredentials.expiration && currentCredentials.expiration < new Date()) {
+      else if (
+        currentCredentials.expiration &&
+        currentCredentials.expiration.getTime() - Date.now() < expiryBufferMs
+      ) {
         expired = true;
       }
 
diff --git a/test/unit/lib/aws/awssigv4signer.test.js b/test/unit/lib/aws/awssigv4signer.test.js
index 7c8636fe3..5c6d3b699 100644
--- a/test/unit/lib/aws/awssigv4signer.test.js
+++ b/test/unit/lib/aws/awssigv4signer.test.js
@@ -472,3 +472,125 @@ test('Basic aws failure to refresh credentials', (t) => {
       .catch(t.fail);
   });
 });
+
+test('Basic aws sdk v3 when token expires earlier than `requestTimeout` ms in the future.', (t) => {
+  t.plan(4);
+
+  function handler(req, res) {
+    res.setHeader('Content-Type', 'application/json;utf=8');
+    res.end(JSON.stringify({ hello: 'world' }));
+  }
+
+  buildServer(handler, ({ port }, server) => {
+    const mockRegion = 'us-east-1';
+
+    let getCredentialsCalled = 0;
+
+    const AwsSigv4SignerOptions = {
+      getCredentials: () =>
+        new Promise((resolve) => {
+          setTimeout(() => {
+            getCredentialsCalled++;
+            resolve({
+              accessKeyId: uuidv4(),
+              secretAccessKey: uuidv4(),
+              expiration: new Date(Date.now() + 1000 * 25),
+            });
+          }, 100);
+        }),
+      region: mockRegion,
+    };
+
+    const auth = AwsSigv4Signer(AwsSigv4SignerOptions);
+
+    const client = new Client({
+      ...auth,
+      node: `http://localhost:${port}`,
+      requestTimeout: 1000 * 30,
+    });
+
+    client
+      .search({
+        index: 'test',
+        q: 'foo:bar',
+      })
+      .then(({ body }) => {
+        t.same(body, { hello: 'world' });
+        t.same(getCredentialsCalled, 1);
+        client
+          .search({
+            index: 'test',
+            q: 'foo:bar',
+          })
+          .then(({ body }) => {
+            t.same(body, { hello: 'world' });
+            t.same(getCredentialsCalled, 2);
+
+            server.stop();
+          })
+          .catch(t.fail);
+      })
+      .catch(t.fail);
+  });
+});
+
+test('Basic aws sdk v3 when token expires later than `requestTimeout` ms in the future.', (t) => {
+  t.plan(4);
+
+  function handler(req, res) {
+    res.setHeader('Content-Type', 'application/json;utf=8');
+    res.end(JSON.stringify({ hello: 'world' }));
+  }
+
+  buildServer(handler, ({ port }, server) => {
+    const mockRegion = 'us-east-1';
+
+    let getCredentialsCalled = 0;
+
+    const AwsSigv4SignerOptions = {
+      getCredentials: () =>
+        new Promise((resolve) => {
+          setTimeout(() => {
+            getCredentialsCalled++;
+            resolve({
+              accessKeyId: uuidv4(),
+              secretAccessKey: uuidv4(),
+              expiration: new Date(Date.now() + 1000 * 45),
+            });
+          }, 100);
+        }),
+      region: mockRegion,
+    };
+
+    const auth = AwsSigv4Signer(AwsSigv4SignerOptions);
+
+    const client = new Client({
+      ...auth,
+      node: `http://localhost:${port}`,
+      requestTimeout: 1000 * 30,
+    });
+
+    client
+      .search({
+        index: 'test',
+        q: 'foo:bar',
+      })
+      .then(({ body }) => {
+        t.same(body, { hello: 'world' });
+        t.same(getCredentialsCalled, 1);
+        client
+          .search({
+            index: 'test',
+            q: 'foo:bar',
+          })
+          .then(({ body }) => {
+            t.same(body, { hello: 'world' });
+            t.same(getCredentialsCalled, 1);
+
+            server.stop();
+          })
+          .catch(t.fail);
+      })
+      .catch(t.fail);
+  });
+});