diff --git a/src/__tests__/linkup-client.test.ts b/src/__tests__/linkup-client.test.ts
index cadbc56..81a6789 100644
--- a/src/__tests__/linkup-client.test.ts
+++ b/src/__tests__/linkup-client.test.ts
@@ -9,6 +9,8 @@ import {
   LinkupInvalidRequestError,
   LinkupNoResultError,
   LinkupPaymentRequiredError,
+  LinkupTaskNotFoundError,
+  LinkupTasksQueueLimitExceededError,
   LinkupTooManyRequestsError,
   LinkupUnknownError,
 } from '../errors';
@@ -732,6 +734,15 @@ describe('LinkupClient', () => {
           statusCode: 403,
         },
       },
+      {
+        description: '404 TASK_NOT_FOUND',
+        ErrorClass: LinkupTaskNotFoundError,
+        expectedMessage: 'Task task-123 not found.',
+        input: {
+          error: { code: 'TASK_NOT_FOUND', details: [], message: 'Task task-123 not found.' },
+          statusCode: 404,
+        },
+      },
       {
         description: '429 INSUFFICIENT_FUNDS_CREDITS',
         ErrorClass: LinkupInsufficientCreditError,
@@ -758,6 +769,21 @@ describe('LinkupClient', () => {
           statusCode: 429,
         },
       },
+      {
+        description: '429 TASKS_QUEUE_LIMIT_EXCEEDED',
+        ErrorClass: LinkupTasksQueueLimitExceededError,
+        expectedMessage:
+          'Too many pending tasks. You have 0 slots available (max 100). Please wait for some tasks to complete before submitting new ones.',
+        input: {
+          error: {
+            code: 'TASKS_QUEUE_LIMIT_EXCEEDED',
+            details: [],
+            message:
+              'Too many pending tasks. You have 0 slots available (max 100). Please wait for some tasks to complete before submitting new ones.',
+          },
+          statusCode: 429,
+        },
+      },
       {
         description: '429 TOO_MANY_REQUESTS',
         ErrorClass: LinkupTooManyRequestsError,
diff --git a/src/errors.ts b/src/errors.ts
index b525f96..c2f3be7 100644
--- a/src/errors.ts
+++ b/src/errors.ts
@@ -46,6 +46,19 @@ export class LinkupAuthenticationError extends Error {
   }
 }
 
+// Task not found error, raised when the Linkup API returns a 404 status code.
+// It is returned when a task or research task does not exist.
+export class LinkupTaskNotFoundError extends LinkupError {
+  constructor(message?: string) {
+    super(message);
+    this.name = LinkupTaskNotFoundError.name;
+
+    if ('captureStackTrace' in Error) {
+      Error.captureStackTrace(this, LinkupTaskNotFoundError);
+    }
+  }
+}
+
 // Insufficient credit error, raised when the Linkup API returns a 429 status code.
 // It is returned when you have run out of credits.
 export class LinkupInsufficientCreditError extends LinkupError {
@@ -59,6 +72,19 @@ export class LinkupInsufficientCreditError extends LinkupError {
   }
 }
 
+// Tasks queue limit exceeded error, raised when the Linkup API returns a 429 status code.
+// It is returned when you submit more pending tasks than your organization queue allows.
+export class LinkupTasksQueueLimitExceededError extends LinkupError {
+  constructor(message?: string) {
+    super(message);
+    this.name = LinkupTasksQueueLimitExceededError.name;
+
+    if ('captureStackTrace' in Error) {
+      Error.captureStackTrace(this, LinkupTasksQueueLimitExceededError);
+    }
+  }
+}
+
 // Too many requests error, raised when the Linkup API returns a 429 status code.
 // It is returned when you are sending too many requests at a time.
 export class LinkupTooManyRequestsError extends LinkupError {
diff --git a/src/utils/refine-error.utils.ts b/src/utils/refine-error.utils.ts
index e0d15fa..433604c 100644
--- a/src/utils/refine-error.utils.ts
+++ b/src/utils/refine-error.utils.ts
@@ -9,6 +9,8 @@ import {
   LinkupInvalidRequestError,
   LinkupNoResultError,
   LinkupPaymentRequiredError,
+  LinkupTaskNotFoundError,
+  LinkupTasksQueueLimitExceededError,
   LinkupTooManyRequestsError,
   LinkupUnknownError,
 } from '../errors';
@@ -54,11 +56,20 @@ export const refineError = (e: LinkupApiError): LinkupError => {
     case 401:
     case 403:
       return new LinkupAuthenticationError(message);
+    case 404:
+      switch (code) {
+        case 'TASK_NOT_FOUND':
+          return new LinkupTaskNotFoundError(message);
+        default:
+          return new LinkupUnknownError(`An unknown error occurred: ${error.message}`);
+      }
     case 429:
       switch (code) {
         case 'INSUFFICIENT_FUNDS_CREDITS':
         case 'EXCEED_BUDGET_LIMIT':
           return new LinkupInsufficientCreditError(message);
+        case 'TASKS_QUEUE_LIMIT_EXCEEDED':
+          return new LinkupTasksQueueLimitExceededError(message);
         case 'TOO_MANY_REQUESTS':
           return new LinkupTooManyRequestsError(message);
         default: