diff --git a/src/Rules/AbstractFixableRule.php b/src/Rules/AbstractFixableRule.php
index ea7dc298..656df4e3 100644
--- a/src/Rules/AbstractFixableRule.php
+++ b/src/Rules/AbstractFixableRule.php
@@ -13,7 +13,7 @@ abstract class AbstractFixableRule extends AbstractRule implements FixableRuleIn
 {
     private ?FixerInterface $fixer = null;
 
-    protected function init(
+    final protected function init(
         ?Report $report,
         array $ignoredViolations = [],
         ?FixerInterface $fixer = null
@@ -22,7 +22,7 @@ protected function init(
         $this->fixer = $fixer;
     }
 
-    public function fixFile(Tokens $tokens, FixerInterface $fixer): void
+    final public function fixFile(Tokens $tokens, FixerInterface $fixer): void
     {
         $this->init(null, $tokens->getIgnoredViolations(), $fixer);
 
@@ -31,7 +31,7 @@ public function fixFile(Tokens $tokens, FixerInterface $fixer): void
         }
     }
 
-    protected function addFixableWarning(
+    final protected function addFixableWarning(
         string $message,
         Token $token,
         ?string $messageId = null
@@ -44,7 +44,7 @@ protected function addFixableWarning(
         return $this->fixer;
     }
 
-    protected function addFixableError(
+    final protected function addFixableError(
         string $message,
         Token $token,
         ?string $messageId = null
diff --git a/src/Rules/AbstractRule.php b/src/Rules/AbstractRule.php
index 1d2c2af5..e69c8036 100644
--- a/src/Rules/AbstractRule.php
+++ b/src/Rules/AbstractRule.php
@@ -14,7 +14,7 @@ abstract class AbstractRule implements RuleInterface
 {
     use RuleTrait;
 
-    public function lintFile(Tokens $tokens, Report $report): void
+    final public function lintFile(Tokens $tokens, Report $report): void
     {
         $this->init($report, $tokens->getIgnoredViolations());
 
@@ -34,7 +34,7 @@ protected function init(?Report $report, array $ignoredViolations = []): void
 
     abstract protected function process(int $tokenIndex, Tokens $tokens): void;
 
-    protected function addWarning(string $message, Token $token, ?string $messageId = null): bool
+    final protected function addWarning(string $message, Token $token, ?string $messageId = null): bool
     {
         return $this->addMessage(
             Violation::LEVEL_WARNING,
@@ -46,7 +46,7 @@ protected function addWarning(string $message, Token $token, ?string $messageId
         );
     }
 
-    protected function addFileWarning(string $message, Token $token, ?string $messageId = null): bool
+    final protected function addFileWarning(string $message, Token $token, ?string $messageId = null): bool
     {
         return $this->addMessage(
             Violation::LEVEL_WARNING,
@@ -58,7 +58,7 @@ protected function addFileWarning(string $message, Token $token, ?string $messag
         );
     }
 
-    protected function addError(string $message, Token $token, ?string $messageId = null): bool
+    final protected function addError(string $message, Token $token, ?string $messageId = null): bool
     {
         return $this->addMessage(
             Violation::LEVEL_ERROR,
@@ -70,7 +70,7 @@ protected function addError(string $message, Token $token, ?string $messageId =
         );
     }
 
-    protected function addFileError(string $message, Token $token, ?string $messageId = null): bool
+    final protected function addFileError(string $message, Token $token, ?string $messageId = null): bool
     {
         return $this->addMessage(
             Violation::LEVEL_ERROR,
diff --git a/src/Rules/AbstractSpacingRule.php b/src/Rules/AbstractSpacingRule.php
index 9f96e63d..63235f5c 100644
--- a/src/Rules/AbstractSpacingRule.php
+++ b/src/Rules/AbstractSpacingRule.php
@@ -14,7 +14,7 @@ abstract class AbstractSpacingRule extends AbstractFixableRule
 {
     protected bool $skipIfNewLine = true;
 
-    protected function process(int $tokenIndex, Tokens $tokens): void
+    final protected function process(int $tokenIndex, Tokens $tokens): void
     {
         $spaceAfter = $this->getSpaceAfter($tokenIndex, $tokens);
         $spaceBefore = $this->getSpaceBefore($tokenIndex, $tokens);
diff --git a/src/Rules/Node/AbstractNodeRule.php b/src/Rules/Node/AbstractNodeRule.php
index 99325c70..cddec8a8 100644
--- a/src/Rules/Node/AbstractNodeRule.php
+++ b/src/Rules/Node/AbstractNodeRule.php
@@ -15,7 +15,7 @@ abstract class AbstractNodeRule implements NodeRuleInterface
 {
     use RuleTrait;
 
-    public function setReport(Report $report, array $ignoredViolations = []): void
+    final public function setReport(Report $report, array $ignoredViolations = []): void
     {
         $this->report = $report;
         $this->ignoredViolations = $ignoredViolations;
@@ -36,7 +36,7 @@ public function getPriority(): int
         return 0;
     }
 
-    protected function addWarning(string $message, Node $node, ?string $messageId = null): bool
+    final protected function addWarning(string $message, Node $node, ?string $messageId = null): bool
     {
         $templateName = $node->getTemplateName();
         Assert::notNull($templateName, 'Parsed node should always have a source context.');
@@ -51,7 +51,7 @@ protected function addWarning(string $message, Node $node, ?string $messageId =
         );
     }
 
-    protected function addError(string $message, Node $node, ?string $messageId = null): bool
+    final protected function addError(string $message, Node $node, ?string $messageId = null): bool
     {
         $templateName = $node->getTemplateName();
         Assert::notNull($templateName, 'Parsed node should always have a source context.');
diff --git a/tests/FileTestCase.php b/tests/FileTestCase.php
index 753f856e..7d82faa8 100644
--- a/tests/FileTestCase.php
+++ b/tests/FileTestCase.php
@@ -52,7 +52,7 @@ protected function tearDown(): void
         chdir($this->cwd);
     }
 
-    protected function getFilesystem(): Filesystem
+    final protected function getFilesystem(): Filesystem
     {
         if (null === $this->filesystem) {
             $this->filesystem = new Filesystem();
@@ -61,7 +61,7 @@ protected function getFilesystem(): Filesystem
         return $this->filesystem;
     }
 
-    protected function getTmpPath(string $path): string
+    final protected function getTmpPath(string $path): string
     {
         $path = TestHelper::getOsPath($path);
         if (!str_starts_with($path, $this->getDir())) {