diff --git a/extensions/package-manager/src/Api/Resource/ExternalExtensionResource.php b/extensions/package-manager/src/Api/Resource/ExternalExtensionResource.php
index 0984cbc19..970eca562 100644
--- a/extensions/package-manager/src/Api/Resource/ExternalExtensionResource.php
+++ b/extensions/package-manager/src/Api/Resource/ExternalExtensionResource.php
@@ -32,7 +32,7 @@ use Tobyz\JsonApiServer\Schema\CustomFilter;
 
 class ExternalExtensionResource extends AbstractResource implements Listable, Paginatable, Countable
 {
-    protected int|null $totalResults = null;
+    protected ?int $totalResults = null;
 
     public function __construct(
         protected Repository $cache,
diff --git a/framework/core/src/Api/Context.php b/framework/core/src/Api/Context.php
index 75b45cc6e..478a74bce 100644
--- a/framework/core/src/Api/Context.php
+++ b/framework/core/src/Api/Context.php
@@ -108,27 +108,27 @@ class Context extends BaseContext
         return $this->parameters[$key] ?? $default;
     }
 
-    public function creating(string|null $resource = null): bool
+    public function creating(?string $resource = null): bool
     {
         return $this->endpoint instanceof Endpoint\Create && (! $resource || is_a($this->collection, $resource));
     }
 
-    public function updating(string|null $resource = null): bool
+    public function updating(?string $resource = null): bool
     {
         return $this->endpoint instanceof Endpoint\Update && (! $resource || is_a($this->collection, $resource));
     }
 
-    public function deleting(string|null $resource = null): bool
+    public function deleting(?string $resource = null): bool
     {
         return $this->endpoint instanceof Endpoint\Delete && (! $resource || is_a($this->collection, $resource));
     }
 
-    public function showing(string|null $resource = null): bool
+    public function showing(?string $resource = null): bool
     {
         return $this->endpoint instanceof Endpoint\Show && (! $resource || is_a($this->collection, $resource));
     }
 
-    public function listing(string|null $resource = null): bool
+    public function listing(?string $resource = null): bool
     {
         return $this->endpoint instanceof Endpoint\Index && (! $resource || is_a($this->collection, $resource));
     }
diff --git a/framework/core/src/Api/Endpoint/Concerns/HasAuthorization.php b/framework/core/src/Api/Endpoint/Concerns/HasAuthorization.php
index e61dcc600..d105ca7e0 100644
--- a/framework/core/src/Api/Endpoint/Concerns/HasAuthorization.php
+++ b/framework/core/src/Api/Endpoint/Concerns/HasAuthorization.php
@@ -60,7 +60,7 @@ trait HasAuthorization
             : ($this->authenticated)($context));
     }
 
-    public function getAuthorized(Context $context): string|null
+    public function getAuthorized(Context $context): ?string
     {
         if (! is_callable($this->ability)) {
             return $this->ability;
diff --git a/framework/core/src/Extend/Link.php b/framework/core/src/Extend/Link.php
index 13eff72fb..fe27b7598 100644
--- a/framework/core/src/Extend/Link.php
+++ b/framework/core/src/Extend/Link.php
@@ -19,8 +19,8 @@ use s9e\TextFormatter\Utils;
 
 class Link implements ExtenderInterface
 {
-    protected Closure|null $setRel = null;
-    protected Closure|null $setTarget = null;
+    protected ?Closure $setRel = null;
+    protected ?Closure $setTarget = null;
 
     public function setRel(Closure $callable): self
     {