diff --git a/package-lock.json b/package-lock.json
index 2195477..3c58f44 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,6 +19,7 @@
       },
       "devDependencies": {
         "@eslint/js": "^9.8.0",
+        "@testing-library/user-event": "^14.5.2",
         "@types/react": "^18.3.3",
         "@types/react-dom": "^18.3.0",
         "@vitejs/plugin-react": "^4.3.1",
@@ -1692,6 +1693,20 @@
         }
       }
     },
+    "node_modules/@testing-library/user-event": {
+      "version": "14.5.2",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-14.5.2.tgz",
+      "integrity": "sha512-YAh82Wh4TIrxYLmfGcixwD18oIjyC1pFQC2Y01F2lzV2HTMiYrI0nze0FD0ocB//CKS/7jIUgae+adPqxK5yCQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12",
+        "npm": ">=6"
+      },
+      "peerDependencies": {
+        "@testing-library/dom": ">=7.21.4"
+      }
+    },
     "node_modules/@types/aria-query": {
       "version": "5.0.4",
       "resolved": "https://registry.npmjs.org/@types/aria-query/-/aria-query-5.0.4.tgz",
diff --git a/package.json b/package.json
index 1ee556f..594782c 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.8.0",
+    "@testing-library/user-event": "^14.5.2",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
diff --git a/src/PullRequestViewer.test.tsx b/src/PullRequestViewer.test.tsx
index 10f2959..ca6bc07 100644
--- a/src/PullRequestViewer.test.tsx
+++ b/src/PullRequestViewer.test.tsx
@@ -2,6 +2,7 @@
 
 import React from 'react';
 import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
 import PullRequestViewer from './PullRequestViewer';
 
 describe('PullRequestViewer', () => {
@@ -16,4 +17,35 @@ describe('PullRequestViewer', () => {
     const selectElement = screen.getByRole('combobox', { name: /select a repository/i });
     expect(selectElement).toBeInTheDocument();
   });
+
+  it('renders the sort select dropdown', () => {
+    render(<PullRequestViewer />);
+    const sortSelect = screen.getByRole('combobox', { name: /sort pull requests/i });
+    expect(sortSelect).toBeInTheDocument();
+  });
+
+  it('displays default sort option', () => {
+    render(<PullRequestViewer />);
+    const defaultOption = screen.getByText('Creation Date (Newest)');
+    expect(defaultOption).toBeInTheDocument();
+  });
+
+  it('shows all sorting options', async () => {
+    render(<PullRequestViewer />);
+    const sortSelect = screen.getByRole('combobox', { name: /sort pull requests/i });
+    await userEvent.click(sortSelect);
+
+    const expectedOptions = [
+      'Creation Date (Newest)',
+      'Creation Date (Oldest)',
+      'Last Updated (Newest)',
+      'Last Updated (Oldest)',
+      'PR Number (Highest)',
+      'PR Number (Lowest)',
+    ];
+
+    expectedOptions.forEach(option => {
+      expect(screen.getAllByText(option)[0]).toBeInTheDocument();
+    });
+  });
 });
diff --git a/src/PullRequestViewer.tsx b/src/PullRequestViewer.tsx
index c2e9399..923e115 100644
--- a/src/PullRequestViewer.tsx
+++ b/src/PullRequestViewer.tsx
@@ -1,6 +1,5 @@
 
 
-
 import React, { useState, useEffect } from 'react';
 import { Octokit } from '@octokit/rest';
 import Select from 'react-select';
@@ -14,6 +13,9 @@ interface PullRequest {
   user: {
     login: string;
   };
+  created_at: string;
+  updated_at: string;
+  number: number;
 }
 
 interface Repo {
@@ -21,10 +23,26 @@ interface Repo {
   label: string;
 }
 
+interface SortOption {
+  value: keyof PullRequest | 'number' | 'created_at' | 'updated_at';
+  label: string;
+  direction: 'asc' | 'desc';
+}
+
+const sortOptions: SortOption[] = [
+  { value: 'created_at', label: 'Creation Date (Newest)', direction: 'desc' },
+  { value: 'created_at', label: 'Creation Date (Oldest)', direction: 'asc' },
+  { value: 'updated_at', label: 'Last Updated (Newest)', direction: 'desc' },
+  { value: 'updated_at', label: 'Last Updated (Oldest)', direction: 'asc' },
+  { value: 'number', label: 'PR Number (Highest)', direction: 'desc' },
+  { value: 'number', label: 'PR Number (Lowest)', direction: 'asc' },
+];
+
 const PullRequestViewer: React.FC = () => {
   const [repos, setRepos] = useState<Repo[]>([]);
   const [selectedRepo, setSelectedRepo] = useState<Repo | null>(null);
   const [pullRequests, setPullRequests] = useState<PullRequest[]>([]);
+  const [selectedSort, setSelectedSort] = useState<SortOption>(sortOptions[0]);
 
   useEffect(() => {
     const fetchRepos = async () => {
@@ -33,7 +51,7 @@ const PullRequestViewer: React.FC = () => {
           org: GITHUB_ORG,
           type: 'all',
         });
-        const repoOptions = response.data.map(repo => ({
+        const repoOptions = response.data.map((repo) => ({
           value: repo.name,
           label: repo.name,
         }));
@@ -49,7 +67,7 @@ const PullRequestViewer: React.FC = () => {
     const fetchPullRequests = async () => {
       if (selectedRepo) {
         try {
-          let allPullRequests: PullRequest[] = [];
+          const allPullRequests: PullRequest[] = [];
           let page = 1;
           let hasNextPage = true;
 
@@ -59,10 +77,10 @@ const PullRequestViewer: React.FC = () => {
               repo: selectedRepo.value,
               state: 'open',
               per_page: 100,
-              page: page,
+              page,
             });
 
-            allPullRequests = [...allPullRequests, ...response.data];
+            allPullRequests.push(...response.data);
 
             if (response.data.length < 100) {
               hasNextPage = false;
@@ -80,25 +98,55 @@ const PullRequestViewer: React.FC = () => {
     fetchPullRequests();
   }, [selectedRepo]);
 
+  const sortPullRequests = (prs: PullRequest[]) => {
+    return [...prs].sort((a, b) => {
+      const aValue = a[selectedSort.value];
+      const bValue = b[selectedSort.value];
+      
+      if (selectedSort.direction === 'asc') {
+        return aValue < bValue ? -1 : aValue > bValue ? 1 : 0;
+      } else {
+        return bValue < aValue ? -1 : bValue > aValue ? 1 : 0;
+      }
+    });
+  };
+
+  const sortedPullRequests = sortPullRequests(pullRequests);
+
   return (
     <div>
       <h1>Pull Request Viewer</h1>
-      <Select
-        options={repos}
-        value={selectedRepo}
-        onChange={(option) => setSelectedRepo(option as Repo)}
-        placeholder="Select a repository"
-        aria-label="Select a repository"
-      />
-      {pullRequests.length > 0 ? (
+      <div style={{ marginBottom: '1rem' }}>
+        <Select
+          options={repos}
+          value={selectedRepo}
+          onChange={(option) => setSelectedRepo(option as Repo)}
+          placeholder="Select a repository"
+          aria-label="Select a repository"
+        />
+      </div>
+      <div style={{ marginBottom: '1rem' }}>
+        <Select
+          options={sortOptions}
+          value={selectedSort}
+          onChange={(option) => setSelectedSort(option as SortOption)}
+          placeholder="Sort by"
+          aria-label="Sort pull requests"
+        />
+      </div>
+      {sortedPullRequests.length > 0 ? (
         <ul>
-          {pullRequests.map((pr) => (
+          {sortedPullRequests.map((pr) => (
             <li key={pr.html_url}>
               <a href={pr.html_url} target="_blank" rel="noopener noreferrer">
                 {pr.title}
               </a>
               {' by '}
               {pr.user.login}
+              {' - '}
+              Created: {new Date(pr.created_at).toLocaleDateString()}
+              {', '}
+              Last updated: {new Date(pr.updated_at).toLocaleDateString()}
             </li>
           ))}
         </ul>