diff --git a/src/AllowedFilter.php b/src/AllowedFilter.php
index a9ba5bb..8d87d67 100644
--- a/src/AllowedFilter.php
+++ b/src/AllowedFilter.php
@@ -52,54 +52,54 @@ public static function setFilterArrayValueDelimiter(string $delimiter = null): v
         }
     }
 
-    public static function exact(string $name, ?string $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): self
+    public static function exact(string $name, ?string $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersExact($addRelationConstraint), $internalName);
     }
 
-    public static function partial(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): self
+    public static function partial(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersPartial($addRelationConstraint), $internalName);
     }
 
-    public static function beginsWithStrict(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): self
+    public static function beginsWithStrict(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersBeginsWithStrict($addRelationConstraint), $internalName);
     }
 
-    public static function endsWithStrict(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): self
+    public static function endsWithStrict(string $name, $internalName = null, bool $addRelationConstraint = true, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersEndsWithStrict($addRelationConstraint), $internalName);
     }
 
-    public static function scope(string $name, $internalName = null, string $arrayValueDelimiter = null): self
+    public static function scope(string $name, $internalName = null, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersScope(), $internalName);
     }
 
-    public static function callback(string $name, $callback, $internalName = null, string $arrayValueDelimiter = null): self
+    public static function callback(string $name, $callback, $internalName = null, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
         return new static($name, new FiltersCallback($callback), $internalName);
     }
 
-    public static function trashed(string $name = 'trashed', $internalName = null): self
+    public static function trashed(string $name = 'trashed', $internalName = null): static
     {
         return new static($name, new FiltersTrashed(), $internalName);
     }
 
-    public static function custom(string $name, Filter $filterClass, $internalName = null, string $arrayValueDelimiter = null): self
+    public static function custom(string $name, Filter $filterClass, $internalName = null, string $arrayValueDelimiter = null): static
     {
         static::setFilterArrayValueDelimiter($arrayValueDelimiter);
 
@@ -121,7 +121,7 @@ public function isForFilter(string $filterName): bool
         return $this->name === $filterName;
     }
 
-    public function ignore(...$values): self
+    public function ignore(...$values): static
     {
         $this->ignored = $this->ignored
             ->merge($values)
@@ -140,7 +140,7 @@ public function getInternalName(): string
         return $this->internalName;
     }
 
-    public function default($value): self
+    public function default($value): static
     {
         $this->hasDefault = true;
         $this->default = $value;
@@ -162,14 +162,14 @@ public function hasDefault(): bool
         return $this->hasDefault;
     }
 
-    public function nullable(bool $nullable = true): self
+    public function nullable(bool $nullable = true): static
     {
         $this->nullable = $nullable;
 
         return $this;
     }
 
-    public function unsetDefault(): self
+    public function unsetDefault(): static
     {
         $this->hasDefault = false;
         unset($this->default);