--- a/rector.php
+++ b/rector.php
@@ -44,6 +44,7 @@ use Rector\Privatization\Rector\Property\PrivatizeFinalClassPropertyRector;
 use Rector\Set\ValueObject\LevelSetList;
 use Rector\Set\ValueObject\SetList;
 use Rector\Strict\Rector\If_\BooleanInIfConditionRuleFixerRector;
+use Rector\TypeDeclaration\Rector\StmtsAwareInterface\DeclareStrictTypesRector;
 use Utils\Rector\PassStrictParameterToFunctionParameterRector;
 use Utils\Rector\RemoveErrorSuppressInTryCatchStmtsRector;
 use Utils\Rector\RemoveVarTagFromClassConstantRector;
@@ -107,6 +108,15 @@ return static function (RectorConfig $rectorConfig): void {
             __DIR__ . '/system/Session/Handlers',
         ],
 
+        DeclareStrictTypesRector::class => [
+            __DIR__ . '/app',
+            __DIR__ . '/system/Commands/Generators/Views',
+            __DIR__ . '/system/Pager/Views',
+            __DIR__ . '/system/Validation/Views',
+            __DIR__ . '/system/View/Parser.php',
+            __DIR__ . '/tests/system/View/Views',
+        ],
+
         // use mt_rand instead of random_int on purpose on non-cryptographically random
         RandomFunctionRector::class,
 
@@ -117,6 +127,7 @@ return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->importNames();
     $rectorConfig->removeUnusedImports();
 
+    $rectorConfig->rule(DeclareStrictTypesRector::class);
     $rectorConfig->rule(UnderscoreToCamelCaseVariableNameRector::class);
     $rectorConfig->rule(SimplifyUselessVariableRector::class);
     $rectorConfig->rule(RemoveAlwaysElseRector::class);