diff --git a/CHANGELOG.md b/CHANGELOG.md
index c20517d..9fe0b89 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,25 @@
 
 All notable changes to `ohdear-php-sdk` will be documented in this file
 
+## 4.6.0 - 2026-03-26
+
+### What's Changed
+
+* Chore | Upgrade to Saloon v4 by @Sammyjo20 in https://github.com/ohdearapp/ohdear-php-sdk/pull/70
+
+### New Contributors
+
+* @Sammyjo20 made their first contribution in https://github.com/ohdearapp/ohdear-php-sdk/pull/70
+
+**Full Changelog**: https://github.com/ohdearapp/ohdear-php-sdk/compare/4.4.3...4.6.0
+
+## Add warning state support - 2026-02-28
+
+### What changed
+
+- Added `CheckResult` backed string enum (`pending`, `succeeded`, `warning`, `failed`, `errored-or-timed-out`) with helper methods (`isUp()`, `isDown()`, `isPending()`, `isWarning()`)
+- Added `checkResult()` method to `Check`, `Monitor`, and `CheckSummary` DTOs that returns the typed enum
+
 ## Add missing API endpoints - 2026-02-17
 
 ### What changed
diff --git a/README.md b/README.md
index e40a01e..7196f70 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 ![Tests](https://github.com/ohdearapp/ohdear-php-sdk/workflows/run-tests/badge.svg)
 [![Total Downloads](https://img.shields.io/packagist/dt/ohdearapp/ohdear-php-sdk.svg?style=flat-square)](https://packagist.org/packages/ohdearapp/ohdear-php-sdk)
 
-This package is the official PHP SDK for the [Oh Dear](https://ohdear.app) API, built with [Saloon](https://docs.saloon.dev/) v3.
+This package is the official PHP SDK for the [Oh Dear](https://ohdear.app) API, built with [Saloon](https://docs.saloon.dev/) v4.
 
 ```php
 use OhDear\PhpSdk\OhDear;
@@ -152,9 +152,51 @@ $checkSummary = $ohDear->checkSummary($monitorId, CheckType::CertificateHealth);
 
 echo "Check result: {$checkSummary->result}\n";
 echo "Summary: {$checkSummary->summary}\n";
+
+// Use the checkResult() method to get the typed enum with helper methods
+if ($checkSummary->checkResult()->isUp()) {
+    echo "Monitor is reachable\n";
+}
+
+if ($checkSummary->checkResult()->isWarning()) {
+    echo "Partial connectivity issue detected\n";
+}
+
+if ($checkSummary->checkResult()->isDown()) {
+    echo "Monitor is down\n";
+}
 ```
 
-You can request a summary for all available cases in the `CheckType` enum.`
+You can request a summary for all available cases in the `CheckType` enum.
+
+#### Check result enum
+
+The `CheckResult` enum represents the possible states of a check. Access it via the `checkResult()` method available on `Check`, `Monitor`, and `CheckSummary` DTOs:
+
+```php
+use OhDear\PhpSdk\Enums\CheckResult;
+
+$checkSummary = $ohDear->checkSummary($monitorId, CheckType::Uptime);
+
+// The raw string is still available
+echo $checkSummary->result; // 'succeeded', 'warning', 'failed', etc.
+
+// Use checkResult() for the typed enum
+$result = $checkSummary->checkResult();
+
+// Available cases:
+CheckResult::Pending;          // 'pending'
+CheckResult::Succeeded;        // 'succeeded'
+CheckResult::Warning;          // 'warning' — primary location reports down, secondary confirms reachable
+CheckResult::Failed;           // 'failed'
+CheckResult::ErroredOrTimedOut; // 'errored-or-timed-out'
+
+// Helper methods:
+$result->isUp();      // true for Succeeded and Warning
+$result->isDown();    // true for Failed and ErroredOrTimedOut
+$result->isPending(); // true for Pending only
+$result->isWarning(); // true for Warning only
+```
 
 #### Getting certificate health for a monitor
 
diff --git a/composer.json b/composer.json
index b56d824..122de07 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
     "require": {
         "php": "^8.1",
         "saloonphp/pagination-plugin": "^2.2",
-        "saloonphp/saloon": "^3.14"
+        "saloonphp/saloon": "^4.0"
     },
     "require-dev": {
         "laravel/pint": "^1.27",
diff --git a/src/Dto/Check.php b/src/Dto/Check.php
index da090c1..4715c2d 100644
--- a/src/Dto/Check.php
+++ b/src/Dto/Check.php
@@ -2,6 +2,8 @@
 
 namespace OhDear\PhpSdk\Dto;
 
+use OhDear\PhpSdk\Enums\CheckResult;
+
 class Check
 {
     public function __construct(
@@ -17,6 +19,15 @@ public function __construct(
         public ?array $activeSnooze,
     ) {}
 
+    public function checkResult(): ?CheckResult
+    {
+        if ($this->latestRunResult === null) {
+            return null;
+        }
+
+        return CheckResult::tryFrom($this->latestRunResult);
+    }
+
     public static function fromResponse(array $data): self
     {
         return new self(
diff --git a/src/Dto/CheckSummary.php b/src/Dto/CheckSummary.php
index 44149b9..914b180 100644
--- a/src/Dto/CheckSummary.php
+++ b/src/Dto/CheckSummary.php
@@ -2,18 +2,29 @@
 
 namespace OhDear\PhpSdk\Dto;
 
+use OhDear\PhpSdk\Enums\CheckResult;
+
 class CheckSummary
 {
     public function __construct(
-        public string $result,
+        public ?string $result,
         public ?string $summary,
     ) {}
 
+    public function checkResult(): ?CheckResult
+    {
+        if ($this->result === null) {
+            return null;
+        }
+
+        return CheckResult::tryFrom($this->result);
+    }
+
     public static function fromResponse(array $data): self
     {
         return new self(
-            result: $data['result'],
-            summary: $data['summary'],
+            result: $data['result'] ?? null,
+            summary: $data['summary'] ?? null,
         );
     }
 }
diff --git a/src/Dto/Monitor.php b/src/Dto/Monitor.php
index 77fc585..5c04304 100644
--- a/src/Dto/Monitor.php
+++ b/src/Dto/Monitor.php
@@ -2,6 +2,8 @@
 
 namespace OhDear\PhpSdk\Dto;
 
+use OhDear\PhpSdk\Enums\CheckResult;
+
 class Monitor
 {
     public function __construct(
@@ -40,6 +42,15 @@ public function __construct(
         public ?string $updatedAt = null,
     ) {}
 
+    public function checkResult(): ?CheckResult
+    {
+        if ($this->summarizedCheckResult === null) {
+            return null;
+        }
+
+        return CheckResult::tryFrom($this->summarizedCheckResult);
+    }
+
     public static function fromResponse(array $data): self
     {
         return new self(
diff --git a/src/Enums/CheckResult.php b/src/Enums/CheckResult.php
new file mode 100644
index 0000000..6377521
--- /dev/null
+++ b/src/Enums/CheckResult.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace OhDear\PhpSdk\Enums;
+
+enum CheckResult: string
+{
+    case Pending = 'pending';
+    case Succeeded = 'succeeded';
+    case Warning = 'warning';
+    case Failed = 'failed';
+    case ErroredOrTimedOut = 'errored-or-timed-out';
+
+    public function isUp(): bool
+    {
+        return match ($this) {
+            self::Succeeded, self::Warning => true,
+            default => false,
+        };
+    }
+
+    public function isDown(): bool
+    {
+        return match ($this) {
+            self::Failed, self::ErroredOrTimedOut => true,
+            default => false,
+        };
+    }
+
+    public function isPending(): bool
+    {
+        return $this === self::Pending;
+    }
+
+    public function isWarning(): bool
+    {
+        return $this === self::Warning;
+    }
+}
diff --git a/tests/Fixtures/Saloon/check-summary-warning.json b/tests/Fixtures/Saloon/check-summary-warning.json
new file mode 100644
index 0000000..63d6ed8
--- /dev/null
+++ b/tests/Fixtures/Saloon/check-summary-warning.json
@@ -0,0 +1,21 @@
+{
+    "statusCode": 200,
+    "headers": {
+        "Date": "Sun, 10 Aug 2025 18:46:17 GMT",
+        "Content-Type": "application\/json",
+        "Transfer-Encoding": "chunked",
+        "Connection": "keep-alive",
+        "Server": "cloudflare",
+        "Vary": "Accept-Encoding",
+        "Cache-Control": "no-cache, private",
+        "X-Ratelimit-Limit": "500",
+        "X-Ratelimit-Remaining": "498",
+        "Access-Control-Allow-Origin": "*",
+        "X-Frame-Options": "SAMEORIGIN",
+        "X-Xss-Protection": "1; mode=block",
+        "X-Content-Type-Options": "nosniff",
+        "Cf-Cache-Status": "BYPASS"
+    },
+    "data": "{\"result\":\"warning\",\"summary\":\"Primary location reports down, secondary confirms reachable.\"}",
+    "context": []
+}
diff --git a/tests/OhDearTests/CheckResultTest.php b/tests/OhDearTests/CheckResultTest.php
new file mode 100644
index 0000000..4152fb0
--- /dev/null
+++ b/tests/OhDearTests/CheckResultTest.php
@@ -0,0 +1,57 @@
+<?php
+
+use OhDear\PhpSdk\Enums\CheckResult;
+
+it('has all expected cases', function () {
+    expect(CheckResult::cases())->toHaveCount(5);
+    expect(CheckResult::Pending->value)->toBe('pending');
+    expect(CheckResult::Succeeded->value)->toBe('succeeded');
+    expect(CheckResult::Warning->value)->toBe('warning');
+    expect(CheckResult::Failed->value)->toBe('failed');
+    expect(CheckResult::ErroredOrTimedOut->value)->toBe('errored-or-timed-out');
+});
+
+it('can be created from string values', function () {
+    expect(CheckResult::from('succeeded'))->toBe(CheckResult::Succeeded);
+    expect(CheckResult::from('warning'))->toBe(CheckResult::Warning);
+    expect(CheckResult::from('failed'))->toBe(CheckResult::Failed);
+    expect(CheckResult::from('pending'))->toBe(CheckResult::Pending);
+    expect(CheckResult::from('errored-or-timed-out'))->toBe(CheckResult::ErroredOrTimedOut);
+});
+
+it('returns null for unknown values with tryFrom', function () {
+    expect(CheckResult::tryFrom('unknown'))->toBeNull();
+    expect(CheckResult::tryFrom(''))->toBeNull();
+});
+
+it('correctly identifies up states', function () {
+    expect(CheckResult::Succeeded->isUp())->toBeTrue();
+    expect(CheckResult::Warning->isUp())->toBeTrue();
+    expect(CheckResult::Pending->isUp())->toBeFalse();
+    expect(CheckResult::Failed->isUp())->toBeFalse();
+    expect(CheckResult::ErroredOrTimedOut->isUp())->toBeFalse();
+});
+
+it('correctly identifies down states', function () {
+    expect(CheckResult::Failed->isDown())->toBeTrue();
+    expect(CheckResult::ErroredOrTimedOut->isDown())->toBeTrue();
+    expect(CheckResult::Succeeded->isDown())->toBeFalse();
+    expect(CheckResult::Warning->isDown())->toBeFalse();
+    expect(CheckResult::Pending->isDown())->toBeFalse();
+});
+
+it('correctly identifies pending state', function () {
+    expect(CheckResult::Pending->isPending())->toBeTrue();
+    expect(CheckResult::Succeeded->isPending())->toBeFalse();
+    expect(CheckResult::Warning->isPending())->toBeFalse();
+    expect(CheckResult::Failed->isPending())->toBeFalse();
+    expect(CheckResult::ErroredOrTimedOut->isPending())->toBeFalse();
+});
+
+it('correctly identifies warning state', function () {
+    expect(CheckResult::Warning->isWarning())->toBeTrue();
+    expect(CheckResult::Succeeded->isWarning())->toBeFalse();
+    expect(CheckResult::Failed->isWarning())->toBeFalse();
+    expect(CheckResult::Pending->isWarning())->toBeFalse();
+    expect(CheckResult::ErroredOrTimedOut->isWarning())->toBeFalse();
+});
diff --git a/tests/OhDearTests/ChecksTest.php b/tests/OhDearTests/ChecksTest.php
index 1be6f4f..7e2e18c 100644
--- a/tests/OhDearTests/ChecksTest.php
+++ b/tests/OhDearTests/ChecksTest.php
@@ -1,5 +1,6 @@
 <?php
 
+use OhDear\PhpSdk\Enums\CheckResult;
 use OhDear\PhpSdk\Requests\Checks\DisableCheckRequest;
 use OhDear\PhpSdk\Requests\Checks\EnableCheckRequest;
 use OhDear\PhpSdk\Requests\Checks\RequestCheckRunRequest;
@@ -21,6 +22,8 @@
 
     expect($check->id)->toBe(940704);
     expect($check->enabled)->toBe(true);
+    expect($check->latestRunResult)->toBe('succeeded');
+    expect($check->checkResult())->toBe(CheckResult::Succeeded);
 });
 
 it('can disable a check', function () {
diff --git a/tests/OhDearTests/MonitorsTest.php b/tests/OhDearTests/MonitorsTest.php
index 10021c0..8c8467b 100644
--- a/tests/OhDearTests/MonitorsTest.php
+++ b/tests/OhDearTests/MonitorsTest.php
@@ -1,5 +1,6 @@
 <?php
 
+use OhDear\PhpSdk\Enums\CheckResult;
 use OhDear\PhpSdk\Enums\CheckType;
 use OhDear\PhpSdk\Requests\Monitors\AddToBrokenLinksWhitelistRequest;
 use OhDear\PhpSdk\Requests\Monitors\CreateMonitorRequest;
@@ -36,6 +37,8 @@
     $monitor = $this->ohDear->monitor(82063);
 
     expect($monitor->url)->toBe('https://laravel.com');
+    expect($monitor->summarizedCheckResult)->toBe('succeeded');
+    expect($monitor->checkResult())->toBe(CheckResult::Succeeded);
 });
 
 it('can create a monitor', function () {
@@ -74,6 +77,24 @@
     $checkSummary = $this->ohDear->checkSummary(82060, CheckType::CertificateHealth);
 
     expect($checkSummary->result)->toBe('succeeded');
+    expect($checkSummary->checkResult())->toBe(CheckResult::Succeeded);
+    expect($checkSummary->checkResult()->isUp())->toBeTrue();
+    expect($checkSummary->checkResult()->isDown())->toBeFalse();
+    expect($checkSummary->checkResult()->isWarning())->toBeFalse();
+});
+
+it('can get a warning check summary for a monitor', function () {
+    MockClient::global([
+        GetCheckSummaryRequest::class => MockResponse::fixture('check-summary-warning'),
+    ]);
+
+    $checkSummary = $this->ohDear->checkSummary(82060, CheckType::Uptime);
+
+    expect($checkSummary->result)->toBe('warning');
+    expect($checkSummary->checkResult())->toBe(CheckResult::Warning);
+    expect($checkSummary->checkResult()->isUp())->toBeTrue();
+    expect($checkSummary->checkResult()->isDown())->toBeFalse();
+    expect($checkSummary->checkResult()->isWarning())->toBeTrue();
 });
 
 it('can get notification destinations for a monitor', function () {