diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cbf1033..ea3d848 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        php_version: [8.0, 8.1, 8.2]
+        php_version: [8.1, 8.2]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        php_version: [8.0, 8.1, 8.2]
+        php_version: [8.1, 8.2]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
diff --git a/README.md b/README.md
index fa43e88..c88f558 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ If you would like to help, check out the [Contributing](#contributing) section b
 
 ## Requirements
 
-This package requires PHP `8.0` or above.
+This package requires PHP `8.1` or above.
 
 
 ## Installation
diff --git a/composer.json b/composer.json
index 3c8900d..3dc5864 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
 	],
 	"minimum-stability": "stable",
 	"require": {
-		"php": ">=8.0",
-		"symfony/http-client": "^6.2"
+		"php": ">=8.1",
+		"symfony/http-client": "^6.2.7"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^10.0",
diff --git a/src/Api/Module/CmsEndpoints.php b/src/Api/Module/CmsEndpoints.php
index fad4b04..8bfecfa 100644
--- a/src/Api/Module/CmsEndpoints.php
+++ b/src/Api/Module/CmsEndpoints.php
@@ -48,11 +48,22 @@ public function getCollection(string $collectionId): Collection
 	/**
 	 * Get all items for a collection
 	 *
+	 * @param string $sortBy        Defines the field by which to sort the results.
+	 * 								Either a `CollectionItem::SORT_BY_` constant or the slug of a field from the collection.
+	 * @param string $sortDirection	Either `ASC` or `DESC`.
 	 * @return PaginatedList<CollectionItem>
 	 */
-	public function listCollectionItems(string|Collection $collectionId): PaginatedList
+	public function listCollectionItems(string|Collection $collectionId, string $sortBy = CollectionItem::SORT_BY_CREATED_ON, string $sortDirection = 'ASC'): PaginatedList
 	{
-		return $this->requestWithPagination(CollectionItem::class, "/collections/{$collectionId}/items");
+		$sortPrefix = strtoupper($sortDirection) === 'DESC' ? '-' : '';
+
+		return $this->requestWithPagination(
+			CollectionItem::class,
+			"/collections/{$collectionId}/items",
+			[
+				'sort[]' => $sortPrefix . $sortBy,
+			]
+		);
 	}
 
 	/**
diff --git a/src/Api/Module/MembershipEndpoints.php b/src/Api/Module/MembershipEndpoints.php
index 0e15787..a817e13 100644
--- a/src/Api/Module/MembershipEndpoints.php
+++ b/src/Api/Module/MembershipEndpoints.php
@@ -21,11 +21,22 @@ trait MembershipEndpoints
 	/**
 	 * Get a list of users for a site
 	 *
+	 * @param string $sortBy        Defines the field by which to sort the results.
+	 * 								Must be a `User::SORT_BY_` constant.
+	 * @param string $sortDirection	Either `ASC` or `DESC`.
 	 * @return PaginatedList<User>
 	 */
-	public function listUsers(string|Site $siteId): PaginatedList
+	public function listUsers(string|Site $siteId, string $sortBy = User::SORT_BY_CREATED_ON, string $sortDirection = 'ASC'): PaginatedList
 	{
-		return $this->requestWithPagination(User::class, "/sites/{$siteId}/users");
+		$sortPrefix = strtoupper($sortDirection) === 'DESC' ? '-' : '';
+
+		return $this->requestWithPagination(
+			User::class,
+			"/sites/{$siteId}/users",
+			[
+				'sort' => $sortPrefix . $sortBy,
+			]
+		);
 	}
 
 	/**
@@ -104,6 +115,8 @@ public function inviteUser(string|Site $siteId, string $email, array $accessGrou
 	 */
 	public function listAccessGroups(string|Site $siteId): PaginatedList
 	{
-		return $this->requestWithPagination(AccessGroup::class, "/sites/{$siteId}/accessgroups");
+		return $this->requestWithPagination(AccessGroup::class, "/sites/{$siteId}/accessgroups", [
+			'sort' => 'CreatedOn',
+		]);
 	}
 }
diff --git a/src/Api/SiteClient.php b/src/Api/SiteClient.php
index 8523899..9abc7bf 100644
--- a/src/Api/SiteClient.php
+++ b/src/Api/SiteClient.php
@@ -158,11 +158,14 @@ public function getCollection(string $collectionId): Collection
 	/**
 	 * Get all items for a collection
 	 *
+	 * @param string $sortBy        Defines the field by which to sort the results.
+	 * 								Either a `CollectionItem::SORT_BY_` constant or the slug of a field from the collection.
+	 * @param string $sortDirection	Either `ASC` or `DESC`.
 	 * @return PaginatedList<CollectionItem>
 	 */
-	public function listCollectionItems(Collection|string $collectionId): PaginatedList
+	public function listCollectionItems(Collection|string $collectionId, string $sortBy = 'created-on', string $sortDirection = 'ASC'): PaginatedList
 	{
-		return $this->client->listCollectionItems($collectionId);
+		return $this->client->listCollectionItems($collectionId, $sortBy, $sortDirection);
 	}
 
 	/**
@@ -228,11 +231,14 @@ public function publishCollectionItems(Collection|string $collectionId, array $i
 	/**
 	 * Get a list of users for a site
 	 *
+	 * @param string $sortBy        Defines the field by which to sort the results.
+	 * 								Must be a `User::SORT_BY_` constant.
+	 * @param string $sortDirection	Either `ASC` or `DESC`.
 	 * @return PaginatedList<User>
 	 */
-	public function listUsers(): PaginatedList
+	public function listUsers(string $sortBy = 'CreatedOn', string $sortDirection = 'ASC'): PaginatedList
 	{
-		return $this->client->listUsers($this->siteId);
+		return $this->client->listUsers($this->siteId, $sortBy, $sortDirection);
 	}
 
 	/**
diff --git a/src/Model/Cms/CollectionItem.php b/src/Model/Cms/CollectionItem.php
index b95d129..3db75aa 100644
--- a/src/Model/Cms/CollectionItem.php
+++ b/src/Model/Cms/CollectionItem.php
@@ -14,6 +14,14 @@
  */
 class CollectionItem extends AbstractWebflowModel
 {
+	public const SORT_BY_CREATED_ON = 'created-on';
+
+	public const SORT_BY_UPDATED_ON = 'updated-on';
+
+	public const SORT_BY_PUBLISHED_ON = 'published-on';
+
+	public const SORT_BY_SLUG = 'slug';
+
 	/**
 	 * Date on which the item was created
 	 */
diff --git a/src/Model/Membership/User.php b/src/Model/Membership/User.php
index d390f22..017a453 100644
--- a/src/Model/Membership/User.php
+++ b/src/Model/Membership/User.php
@@ -13,6 +13,16 @@
  */
 class User extends AbstractWebflowModel
 {
+	public const SORT_BY_STATUS = 'Status';
+
+	public const SORT_BY_EMAIL = 'Email';
+
+	public const SORT_BY_CREATED_ON = 'CreatedOn';
+
+	public const SORT_BY_UPDATED_ON = 'UpdatedOn';
+
+	public const SORT_BY_LAST_LOGIN = 'LastLogin';
+
 	public const STATUS_INVITED = 'invited';
 
 	public const STATUS_UNVERIFIED = 'unverified';
diff --git a/src/Util/PaginatedList.php b/src/Util/PaginatedList.php
index dbc872a..acc4b01 100644
--- a/src/Util/PaginatedList.php
+++ b/src/Util/PaginatedList.php
@@ -26,6 +26,12 @@ class PaginatedList implements Iterator
 	 */
 	public const LIMIT = 100;
 
+	/**
+	 * Total number of items in the list.
+	 * This includes items that haven't been loaded yet.
+	 */
+	public readonly int $total;
+
 	private int $currentItemIndex = 0;
 
 	/**
@@ -35,11 +41,6 @@ class PaginatedList implements Iterator
 	 */
 	private array $pages = [];
 
-	/**
-	 * Total number of pages in the list.
-	 */
-	private int $total = 0;
-
 	/**
 	 * The key that contains the list of data in raw responses.
 	 */
diff --git a/tests/Api/ClientTest.php b/tests/Api/ClientTest.php
index 5e61d1a..c689de6 100644
--- a/tests/Api/ClientTest.php
+++ b/tests/Api/ClientTest.php
@@ -22,9 +22,9 @@ protected function setUp(): void
 
 		// Mock the API client's inner HttpClient
 		$mockResponses = include(__DIR__ . '/../sample_data.php');
-		$mockResponses['/sites/paginationtest/accessgroups'] = $this->generateRandomAccessGroupDataForPaginationTest(0, 205);
-		$mockResponses['/sites/paginationtest/accessgroups?offset=100'] = $this->generateRandomAccessGroupDataForPaginationTest(100, 205);
-		$mockResponses['/sites/paginationtest/accessgroups?offset=200'] = $this->generateRandomAccessGroupDataForPaginationTest(200, 205);
+		$mockResponses['/sites/paginationtest/accessgroups?sort=CreatedOn'] = $this->generateRandomAccessGroupDataForPaginationTest(0, 205);
+		$mockResponses['/sites/paginationtest/accessgroups?sort=CreatedOn&offset=100'] = $this->generateRandomAccessGroupDataForPaginationTest(100, 205);
+		$mockResponses['/sites/paginationtest/accessgroups?sort=CreatedOn&offset=200'] = $this->generateRandomAccessGroupDataForPaginationTest(200, 205);
 		$responseFactory = function (string $method, string $url) use ($mockResponses) {
 			$url = str_replace('https://api.webflow.com', '', $url);
 			return new MockResponse(json_encode($mockResponses[$url][$method]));
diff --git a/tests/real_use_ci_test.php b/tests/real_use_ci_test.php
index 2918238..b987996 100644
--- a/tests/real_use_ci_test.php
+++ b/tests/real_use_ci_test.php
@@ -21,6 +21,13 @@
 $collections = $client->listCollections();
 $testCollection = $client->getCollection($collections[0]->getId());
 
+// Loop over items to test paginated list
+$items = $client->listCollectionItems($testCollection);
+foreach ($items as $i => $item) {
+	$item->name = 'Test item #' . ($i + 1);
+	$client->updateCollectionItem($testCollection, $item, false);
+}
+
 // Create a test item
 $newItem = new CollectionItem(
 	name: 'Test item',
@@ -35,15 +42,9 @@
 	]
 );
 $createdItem = $client->createCollectionItem($testCollection, $newItem, true);
-$createdItem->name .= ' :)';
+$createdItem->name .= ' #' . ($items->total + 1);
 $client->updateCollectionItem($testCollection, $createdItem, true);
 
-// Loop over items to test paginated list
-$items = $client->listCollectionItems($testCollection);
-foreach ($items as $item) {
-	// Nothing to do
-}
-
 // Create a duplicate, then delete it
 $deletionTestItem = new CollectionItem(
 	name: 'Deletion Test Item',
diff --git a/tests/sample_data.php b/tests/sample_data.php
index d55a14c..3b3ffab 100644
--- a/tests/sample_data.php
+++ b/tests/sample_data.php
@@ -382,6 +382,39 @@
 		],
 	],
 
+	'/collections/580e63fc8c9a982ac9b8b745/items?sort[]=created-on' => [
+		'GET' => [
+			'items' => [
+				[
+					'_archived' => false,
+					'_draft' => false,
+					'color' => '#a98080',
+					'name' => 'Exciting blog post title',
+					'post-body' => '<p>Blog post contents...</p>',
+					'post-summary' => 'Summary of exciting blog post',
+					'main-image' => [
+						'fileId' => '580e63fe8c9a982ac9b8b749',
+						'url' => 'https://d1otoma47x30pg.cloudfront.net/580e63fc8c9a982ac9b8b744/580e63fe8c9a982ac9b8b749_1477338110257-image20.jpg',
+					],
+					'slug' => 'exciting-post',
+					'author' => '580e640c8c9a982ac9b8b778',
+					'updated-on' => '2016-11-15T22:45:32.647Z',
+					'updated-by' => 'Person_5660c5338e9d3b0bee3b86aa',
+					'created-on' => '2016-11-15T22:45:32.647Z',
+					'created-by' => 'Person_5660c5338e9d3b0bee3b86aa',
+					'published-on' => null,
+					'published-by' => null,
+					'_cid' => '580e63fc8c9a982ac9b8b745',
+					'_id' => '580e64008c9a982ac9b8b754',
+				],
+			],
+			'count' => 1,
+			'limit' => 1,
+			'offset' => 0,
+			'total' => 1,
+		],
+	],
+
 	'/collections/580e63fc8c9a982ac9b8b745/items' => [
 		'GET' => [
 			'items' => [
@@ -2337,7 +2370,7 @@
 		],
 	],
 
-	'/sites/580e63e98c9a982ac9b8b741/users' => [
+	'/sites/580e63e98c9a982ac9b8b741/users?sort=CreatedOn' => [
 		'GET' => [
 			'users' => [
 				[
@@ -2466,25 +2499,7 @@
 		],
 	],
 
-	'/sites/580e63e98c9a982ac9b8b741/accessgroups' => [
-		'GET' => [
-			'accessGroups' => [
-				[
-					'_id' => '62be58d404be8a6cc900c081',
-					'name' => 'Webflowers',
-					'shortId' => 'jo',
-					'slug' => 'webflowers',
-					'createdOn' => '2022-08-01T19:41:48.349Z',
-				],
-			],
-			'count' => 1,
-			'limit' => 10,
-			'offset' => 0,
-			'total' => 1,
-		],
-	],
-
-	'/sites/paginationtest/accessgroups' => [
+	'/sites/580e63e98c9a982ac9b8b741/accessgroups?sort=CreatedOn' => [
 		'GET' => [
 			'accessGroups' => [
 				[