diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 1121ae1b235..facf2c1361c 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -6,20 +6,8 @@ parameters:
 			count: 1
 			path: src/Extension/CoreExtension.php
 
-		- # Avoid BC-break
-			message: '#^Constructor of class Twig\\Node\\ForNode has an unused parameter \$ifexpr\.$#'
-			identifier: constructor.unusedParameter
-			count: 1
-			path: src/Node/ForNode.php
-
 		- # 2 parameters will be required
 			message: '#^Method Twig\\Node\\IncludeNode\:\:addGetTemplate\(\) invoked with 2 parameters, 1 required\.$#'
 			identifier: arguments.count
 			count: 1
 			path: src/Node/IncludeNode.php
-
-		- # int|string will be supported in 4.x
-			message: '#^PHPDoc tag @param for parameter $name with type int|string is not subtype of native type string\.$#'
-			identifier: parameter.phpDocType
-			count: 5
-			path: src/Node/Node.php
diff --git a/src/Environment.php b/src/Environment.php
index f016048babf..80c578d766d 100644
--- a/src/Environment.php
+++ b/src/Environment.php
@@ -54,7 +54,7 @@ class Environment
     private LoaderInterface $loader;
     private bool $debug;
     private bool $autoReload;
-    private CacheInterface|string|false $cache;
+    private CacheInterface $cache;
     private ?Lexer $lexer = null;
     private ?Parser $parser = null;
     private ?Compiler $compiler = null;
diff --git a/src/ExpressionParser.php b/src/ExpressionParser.php
index d5528f14069..1797d2ec186 100644
--- a/src/ExpressionParser.php
+++ b/src/ExpressionParser.php
@@ -26,9 +26,7 @@
 use Twig\Node\Expression\Ternary\ConditionalTernary;
 use Twig\Node\Expression\TestExpression;
 use Twig\Node\Expression\Unary\AbstractUnary;
-use Twig\Node\Expression\Unary\NegUnary;
 use Twig\Node\Expression\Unary\NotUnary;
-use Twig\Node\Expression\Unary\PosUnary;
 use Twig\Node\Expression\Unary\SpreadUnary;
 use Twig\Node\Expression\Variable\AssignContextVariable;
 use Twig\Node\Expression\Variable\ContextVariable;
diff --git a/src/Runtime/LoopIterator.php b/src/Runtime/LoopIterator.php
index af20fcfd756..db9c0ce7174 100644
--- a/src/Runtime/LoopIterator.php
+++ b/src/Runtime/LoopIterator.php
@@ -45,10 +45,12 @@ public function __construct($seq)
             $this->seq = new \ArrayIterator($seq);
         } elseif ($seq instanceof \IteratorAggregate) {
             do {
+                /** @var \Iterator<TKey, TValue> $seq */
                 $seq = $seq->getIterator();
             } while ($seq instanceof \IteratorAggregate);
             $this->seq = $seq;
         } elseif (is_iterable($seq)) {
+            /** @var \Iterator<TKey, TValue> $seq */
             $this->seq = $seq;
         } else {
             $this->seq = new \EmptyIterator();