diff --git a/src/Array/DotNotation.php b/src/Array/DotNotation.php
index 672f85e..a593ca3 100644
--- a/src/Array/DotNotation.php
+++ b/src/Array/DotNotation.php
@@ -73,7 +73,6 @@ private static function forgetEach(array &$array, array $segments): void
                 self::forgetBySegments($inner, $segments);
             }
         }
-        unset($inner);
     }
 
     /**
@@ -109,12 +108,10 @@ private static function handleWildcardSet(mixed &$target, array $segments, mixed
             foreach ($target as &$inner) {
                 self::setValueBySegments($inner, $segments, $value, $overwrite);
             }
-            unset($inner);
         } elseif ($overwrite) {
             foreach ($target as &$inner) {
                 $inner = $value;
             }
-            unset($inner);
         }
     }
 
diff --git a/src/Config/Concerns/LazyFileConfigCacheTrait.php b/src/Config/Concerns/LazyFileConfigCacheTrait.php
index d4ad809..ee43586 100644
--- a/src/Config/Concerns/LazyFileConfigCacheTrait.php
+++ b/src/Config/Concerns/LazyFileConfigCacheTrait.php
@@ -134,7 +134,7 @@ protected function discoverNamespaces(): array
     {
         $namespaces = [];
 
-        foreach (array_keys($this->items) as $namespace) {
+        foreach ($this->items as $namespace => $_) {
             if (is_string($namespace) && preg_match('/^[A-Za-z0-9_-]+$/', $namespace)) {
                 $namespaces[$namespace] = true;
             }
diff --git a/src/Config/LazyFileConfig.php b/src/Config/LazyFileConfig.php
index b1f3bff..ebfe7f5 100644
--- a/src/Config/LazyFileConfig.php
+++ b/src/Config/LazyFileConfig.php
@@ -504,7 +504,7 @@ protected function syncLoadedNamespacesFromItems(): void
         parent::flushReadCache();
         $this->loadedNamespaces = [];
 
-        foreach (array_keys($this->items) as $namespace) {
+        foreach ($this->items as $namespace => $_) {
             if (!is_string($namespace) || !preg_match('/^[A-Za-z0-9_-]+$/', $namespace)) {
                 continue;
             }
diff --git a/src/Config/Support/EnvValueResolver.php b/src/Config/Support/EnvValueResolver.php
index e045dca..3094fcb 100644
--- a/src/Config/Support/EnvValueResolver.php
+++ b/src/Config/Support/EnvValueResolver.php
@@ -35,7 +35,7 @@ public static function protectEscapedDollars(string $value): string
     public static function resolve(array $items): array
     {
         $resolved = [];
-        foreach (array_keys($items) as $name) {
+        foreach ($items as $name => $_) {
             $resolved[$name] = self::resolveName($name, $items, $resolved, []);
         }