diff --git a/system/CLI/InputOutput.php b/system/CLI/InputOutput.php
index 5b6c1da02f4d..b69c19e2eee1 100644
--- a/system/CLI/InputOutput.php
+++ b/system/CLI/InputOutput.php
@@ -21,7 +21,7 @@ class InputOutput
     /**
      * Is the readline library on the system?
      */
-    private bool $readlineSupport;
+    private readonly bool $readlineSupport;
 
     public function __construct()
     {
diff --git a/system/Commands/Utilities/Routes/SampleURIGenerator.php b/system/Commands/Utilities/Routes/SampleURIGenerator.php
index 4c4cf0c9112e..c0832a382eff 100644
--- a/system/Commands/Utilities/Routes/SampleURIGenerator.php
+++ b/system/Commands/Utilities/Routes/SampleURIGenerator.php
@@ -52,7 +52,7 @@ public function get(string $routeKey): string
     {
         $sampleUri = $routeKey;
 
-        if (strpos($routeKey, '{locale}') !== false) {
+        if (str_contains($routeKey, '{locale}')) {
             $sampleUri = str_replace(
                 '{locale}',
                 config(App::class)->defaultLocale,
diff --git a/system/Validation/StrictRules/Rules.php b/system/Validation/StrictRules/Rules.php
index a077625bb366..d7dd799f140b 100644
--- a/system/Validation/StrictRules/Rules.php
+++ b/system/Validation/StrictRules/Rules.php
@@ -43,7 +43,7 @@ public function differs(
         ?string $error = null,
         ?string $field = null
     ): bool {
-        if (strpos($otherField, '.') !== false) {
+        if (str_contains($otherField, '.')) {
             return $str !== dot_array_search($otherField, $data);
         }
 
@@ -274,7 +274,7 @@ public function matches(
         ?string $error = null,
         ?string $field = null
     ): bool {
-        if (strpos($otherField, '.') !== false) {
+        if (str_contains($otherField, '.')) {
             return $str === dot_array_search($otherField, $data);
         }