diff --git a/app/Views/errors/html/error_exception.php b/app/Views/errors/html/error_exception.php
index 1c094d728872..d27d52fdc576 100644
--- a/app/Views/errors/html/error_exception.php
+++ b/app/Views/errors/html/error_exception.php
@@ -205,7 +205,7 @@
                         </tr>
                         <tr>
                             <td>HTTP Method</td>
-                            <td><?= esc(strtoupper($request->getMethod())) ?></td>
+                            <td><?= esc($request->getMethod()) ?></td>
                         </tr>
                         <tr>
                             <td>IP Address</td>
diff --git a/system/Debug/Exceptions.php b/system/Debug/Exceptions.php
index 0f66f060f349..12c1930279e2 100644
--- a/system/Debug/Exceptions.php
+++ b/system/Debug/Exceptions.php
@@ -128,7 +128,7 @@ public function exceptionHandler(Throwable $exception)
 
         if ($this->config->log === true && ! in_array($statusCode, $this->config->ignoreCodes, true)) {
             $uri       = $this->request->getPath() === '' ? '/' : $this->request->getPath();
-            $routeInfo = '[Method: ' . strtoupper($this->request->getMethod()) . ', Route: ' . $uri . ']';
+            $routeInfo = '[Method: ' . $this->request->getMethod() . ', Route: ' . $uri . ']';
 
             log_message('critical', "{message}\n{routeInfo}\nin {exFile} on line {exLine}.\n{trace}", [
                 'message'   => $exception->getMessage(),
diff --git a/system/Debug/Toolbar.php b/system/Debug/Toolbar.php
index 4a7a20632fd7..b2d54c5d52cc 100644
--- a/system/Debug/Toolbar.php
+++ b/system/Debug/Toolbar.php
@@ -79,7 +79,7 @@ public function run(float $startTime, float $totalTime, RequestInterface $reques
         $data = [];
         // Data items used within the view.
         $data['url']             = current_url();
-        $data['method']          = strtoupper($request->getMethod());
+        $data['method']          = $request->getMethod();
         $data['isAJAX']          = $request->isAJAX();
         $data['startTime']       = $startTime;
         $data['totalTime']       = $totalTime * 1000;
diff --git a/system/Security/Security.php b/system/Security/Security.php
index 4ba665639f36..3868b19f8d84 100644
--- a/system/Security/Security.php
+++ b/system/Security/Security.php
@@ -280,7 +280,7 @@ public function getCSRFTokenName(): string
     public function verify(RequestInterface $request)
     {
         // Protects POST, PUT, DELETE, PATCH
-        $method           = strtoupper($request->getMethod());
+        $method           = $request->getMethod();
         $methodsToProtect = ['POST', 'PUT', 'DELETE', 'PATCH'];
         if (! in_array($method, $methodsToProtect, true)) {
             return $this;
diff --git a/system/Validation/Validation.php b/system/Validation/Validation.php
index 747ac66d9bc4..ae4f030907b4 100644
--- a/system/Validation/Validation.php
+++ b/system/Validation/Validation.php
@@ -501,7 +501,7 @@ public function withRequest(RequestInterface $request): ValidationInterface
             return $this;
         }
 
-        if (in_array(strtolower($request->getMethod()), ['put', 'patch', 'delete'], true)
+        if (in_array($request->getMethod(), ['PUT', 'PATCH', 'DELETE'], true)
             && strpos($request->getHeaderLine('Content-Type'), 'multipart/form-data') === false
         ) {
             $this->data = $request->getRawInput();
diff --git a/tests/system/HTTP/OutgoingRequestTest.php b/tests/system/HTTP/OutgoingRequestTest.php
index 51b2bab6a3fe..d857297d49ef 100644
--- a/tests/system/HTTP/OutgoingRequestTest.php
+++ b/tests/system/HTTP/OutgoingRequestTest.php
@@ -44,8 +44,8 @@ public function testWithMethod(): void
 
         $newRequest = $request->withMethod('POST');
 
-        $this->assertSame('GET', strtoupper($request->getMethod()));
-        $this->assertSame('POST', strtoupper($newRequest->getMethod()));
+        $this->assertSame('GET', $request->getMethod());
+        $this->assertSame('POST', $newRequest->getMethod());
     }
 
     public function testWithUri(): void