diff --git a/composer.json b/composer.json
index 552d2586..a4cbd7ef 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
   ],
   "license": "MIT",
   "require": {
-    "php": ">=7.1.0"
+    "php": "^7.1|^8.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/BelongsTo.php b/src/BelongsTo.php
index 7e9af956..54084669 100644
--- a/src/BelongsTo.php
+++ b/src/BelongsTo.php
@@ -54,7 +54,7 @@ class BelongsTo extends NovaBelongsTo
      * @param  mixed  $resource
      * @return array
      */
-    public function formatAssociatableResource(NovaRequest $request, $resource)
+    public function formatAssociatableResource(NovaRequest $request, $resource): array
     {
         $relation = explode(".", $this->groupedBy);
 
@@ -76,7 +76,7 @@ public function formatAssociatableResource(NovaRequest $request, $resource)
      * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return array
      */
-    public function getRules(NovaRequest $request)
+    public function getRules(NovaRequest $request): array
     {
         $rules = parent::getRules($request);
 
@@ -96,7 +96,7 @@ public function getRules(NovaRequest $request)
      * @param  string  $field
      * @return $this
      */
-    public function groupedBy($field)
+    public function groupedBy($field): BelongsTo
     {
         $this->groupedBy = $field;
 
@@ -109,7 +109,7 @@ public function groupedBy($field)
      * @param  string  $name
      * @return $this
      */
-    public function displayName($name)
+    public function displayName($name): BelongsTo
     {
         $this->displayName = $name;
 
@@ -121,7 +121,7 @@ public function displayName($name)
      *
      * @return $this
      */
-    public function disableRelatableRule()
+    public function disableRelatableRule(): BelongsTo
     {
         $this->disableRelatableRule = true;
 
@@ -133,7 +133,7 @@ public function disableRelatableRule()
      *
      * @return $this
      */
-    public function quickCreate($fillValues = [])
+    public function quickCreate($fillValues = []): BelongsTo
     {
         $this->withMeta(['quickCreate' => true, 'fillValues' => $fillValues]);
 
@@ -145,7 +145,7 @@ public function quickCreate($fillValues = [])
      *
      * @return $this
      */
-    public function disableTrashed()
+    public function disableTrashed(): BelongsTo
     {
         $this->withMeta(['disableTrashed' => true]);
 
@@ -157,7 +157,7 @@ public function disableTrashed()
      *
      * @return array
      */
-    public function meta()
+    public function meta(): array
     {
         return array_merge([
             'wrapperClasses' => $this->wrapperClasses,
diff --git a/src/Boolean.php b/src/Boolean.php
index 81230e34..c29487f5 100644
--- a/src/Boolean.php
+++ b/src/Boolean.php
@@ -35,7 +35,7 @@ class Boolean extends NovaBoolean
      * @param  string  $classes
      * @return $this
      */
-    public function dotClasses($classes)
+    public function dotClasses($classes): Boolean
     {
         return $this->withMeta(['dotClasses' => $classes]);
     }
@@ -46,7 +46,7 @@ public function dotClasses($classes)
      * @param  string  $class
      * @return $this
      */
-    public function successClass($class)
+    public function successClass($class): Boolean
     {
         return $this->withMeta(['successClass' => $class]);
     }
@@ -57,7 +57,7 @@ public function successClass($class)
      * @param  string  $class
      * @return $this
      */
-    public function dangerClass($class)
+    public function dangerClass($class): Boolean
     {
         return $this->withMeta(['dangerClass' => $class]);
     }
@@ -68,7 +68,7 @@ public function dangerClass($class)
      * @param  string  $label
      * @return $this
      */
-    public function yesLabel($label)
+    public function yesLabel($label): Boolean
     {
         return $this->withMeta(['yesLabel' => $label]);
     }
@@ -79,7 +79,7 @@ public function yesLabel($label)
      * @param  string  $label
      * @return $this
      */
-    public function noLabel($label)
+    public function noLabel($label): Boolean
     {
         return $this->withMeta(['noLabel' => $label]);
     }
@@ -89,7 +89,7 @@ public function noLabel($label)
      *
      * @return $this
      */
-    public function hideBooleanLabel()
+    public function hideBooleanLabel(): Boolean
     {
         return $this->withMeta(['hideBooleanLabel' => true]);
     }
diff --git a/src/Currency.php b/src/Currency.php
index 79be2b9b..9f7c7335 100644
--- a/src/Currency.php
+++ b/src/Currency.php
@@ -35,7 +35,7 @@ class Currency extends NovaCurrency
      *
      * @return $this
      */
-    public function colors()
+    public function colors(): Currency
     {
         return $this->withMeta(['colors' => true]);
     }
diff --git a/src/DateTime.php b/src/DateTime.php
index ea8e7415..be505cab 100644
--- a/src/DateTime.php
+++ b/src/DateTime.php
@@ -34,7 +34,7 @@ class DateTime extends NovaDateTime
      *
      * @return $this
      */
-    public function hideTimezone()
+    public function hideTimezone(): DateTime
     {
         return $this->withMeta(['hideTimezone' => true]);
     }
diff --git a/src/FieldServiceProvider.php b/src/FieldServiceProvider.php
index cd040a94..deb4376f 100644
--- a/src/FieldServiceProvider.php
+++ b/src/FieldServiceProvider.php
@@ -15,7 +15,7 @@ class FieldServiceProvider extends ServiceProvider
      *
      * @return void
      */
-    public function boot()
+    public function boot(): void
     {
         Nova::serving(function (ServingNova $event) {
             Nova::script('nova-fields', __DIR__.'/../dist/js/field.js');
@@ -31,7 +31,7 @@ public function boot()
      *
      * @return void
      */
-    public function register()
+    public function register(): void
     {
         //
     }
@@ -41,7 +41,7 @@ public function register()
      *
      * @return array
      */
-    protected function routeConfiguration()
+    protected function routeConfiguration(): array
     {
         return [
             'namespace' => 'R64\NovaFields\Http\Controllers',
diff --git a/src/File.php b/src/File.php
index 6889eff6..097a8964 100644
--- a/src/File.php
+++ b/src/File.php
@@ -58,7 +58,7 @@ public function __construct($name, $attribute = null, $disk = 'public', $storage
      *
      * @return $this
      */
-    public function draggable()
+    public function draggable(): File
     {
         return $this->withMeta(['draggable' => true]);
     }
@@ -68,7 +68,7 @@ public function draggable()
      *
      * @return $this
      */
-    public function previewBeforeUpload()
+    public function previewBeforeUpload(): File
     {
         return $this->withMeta(['previewBeforeUpload' => true]);
     }
@@ -78,7 +78,7 @@ public function previewBeforeUpload()
      *
      * @return array
      */
-    public function meta()
+    public function meta(): array
     {
         return array_merge([
             'wrapperClasses' => $this->wrapperClasses,
diff --git a/src/HasChilds.php b/src/HasChilds.php
index bb312c57..ee27b57a 100644
--- a/src/HasChilds.php
+++ b/src/HasChilds.php
@@ -23,7 +23,7 @@ public function childConfig($childConfig)
      * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return array
      */
-    public function getRules(NovaRequest $request)
+    public function getRules(NovaRequest $request): array
     {
         $result = [];
 
@@ -46,7 +46,7 @@ public function getRules(NovaRequest $request)
      * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return array|string
      */
-    public function getCreationRules(NovaRequest $request)
+    public function getCreationRules(NovaRequest $request): array
     {
         $result = [];
 
@@ -69,7 +69,7 @@ public function getCreationRules(NovaRequest $request)
      * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return array
      */
-    public function getUpdateRules(NovaRequest $request)
+    public function getUpdateRules(NovaRequest $request): array
     {
         $result = [];
 
diff --git a/src/Http/Controllers/AssociatableController.php b/src/Http/Controllers/AssociatableController.php
index fbff5769..a897a327 100644
--- a/src/Http/Controllers/AssociatableController.php
+++ b/src/Http/Controllers/AssociatableController.php
@@ -10,10 +10,10 @@ class AssociatableController extends Controller
     /**
      * List the available related resources for a given resource.
      *
-     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
-     * @return \Illuminate\Http\Response
+     * @param  Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return array
      */
-    public function index(NovaRequest $request)
+    public function index(NovaRequest $request): array
     {
         $fields = $request->newResource()
                         ->availableFields($request);
diff --git a/src/Http/Controllers/ComputedController.php b/src/Http/Controllers/ComputedController.php
index cc5f814f..52d02b6f 100644
--- a/src/Http/Controllers/ComputedController.php
+++ b/src/Http/Controllers/ComputedController.php
@@ -10,10 +10,10 @@ class ComputedController
     /**
      * Compute the value.
      *
-     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @param  Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return mixed
      */
-    public function index(NovaRequest $request)
+    public function index(NovaRequest $request): mixed
     {
         $resourceId = $request->input('resourceId');
         $resourceClass = Nova::resourceForKey($request->resource);
diff --git a/src/Http/Controllers/ComputedValues.php b/src/Http/Controllers/ComputedValues.php
index c85071ef..24d442be 100644
--- a/src/Http/Controllers/ComputedValues.php
+++ b/src/Http/Controllers/ComputedValues.php
@@ -11,7 +11,7 @@ public function __construct($values)
         return $this->values = (object) $values;
     }
 
-    public function __get($key)
+    public function __get($key): bool
     {
         return property_exists($this->values, $key) ? $this->values->$key : null;
     }
diff --git a/src/Http/Controllers/FieldDownloadController.php b/src/Http/Controllers/FieldDownloadController.php
index 3a0df49f..598d01ad 100644
--- a/src/Http/Controllers/FieldDownloadController.php
+++ b/src/Http/Controllers/FieldDownloadController.php
@@ -2,8 +2,9 @@
 
 namespace R64\NovaFields\Http\Controllers;
 
-use Laravel\Nova\Fields\File;
+use Illuminate\Http\Response;
 use Illuminate\Routing\Controller;
+use Laravel\Nova\Fields\File;
 use Laravel\Nova\Http\Requests\NovaRequest;
 
 class FieldDownloadController extends Controller
@@ -11,10 +12,10 @@ class FieldDownloadController extends Controller
     /**
      * Download the given field's contents.
      *
-     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
-     * @return \Illuminate\Http\Response
+     * @param  Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return  Illuminate\Http\Response
      */
-    public function show(NovaRequest $request)
+    public function show(NovaRequest $request): Response
     {
         $resource = $request->findResourceOrFail();
 
diff --git a/src/Image.php b/src/Image.php
index b9406e1e..7a62e3b7 100644
--- a/src/Image.php
+++ b/src/Image.php
@@ -34,7 +34,7 @@ class Image extends NovaImage
      *
      * @return array
      */
-    public function meta()
+    public function meta(): array
     {
         return array_merge([
             'wrapperClasses' => $this->wrapperClasses,
diff --git a/src/JSON.php b/src/JSON.php
index fc3b98b1..31c52b9b 100644
--- a/src/JSON.php
+++ b/src/JSON.php
@@ -87,7 +87,7 @@ public function __construct($name, $fields, $attribute = null, $resolveCallback
      * @param  string  $classes
      * @return $this
      */
-    public function panelTitleClasses($classes)
+    public function panelTitleClasses($classes): JSON
     {
         $this->panelTitleClasses = $classes;
 
@@ -101,7 +101,7 @@ public function panelTitleClasses($classes)
      *
      * @return $this
      */
-    public function flatten($value = true)
+    public function flatten($value = true): JSON
     {
         return $this->withMeta([
             'flatten' => $value
@@ -115,7 +115,7 @@ public function flatten($value = true)
      * @param  string|null  $attribute
      * @return void
      */
-    public function resolve($resource, $attribute = null)
+    public function resolve($resource, $attribute = null): void
     {
         $attribute = $attribute ?? $this->attribute;
 
@@ -151,7 +151,7 @@ public function resolve($resource, $attribute = null)
      * @param  string  $attribute
      * @return void
      */
-    protected function fillAttributeFromRequest(NovaRequest $request, $requestAttribute, $model, $attribute)
+    protected function fillAttributeFromRequest(NovaRequest $request, $requestAttribute, $model, $attribute): void
     {
         $this->fields->each(function ($field) use ($request, $model, $attribute) {
             $field->fillInto($request, $model, $attribute . '->' . $field->attribute, $attribute . '.' . $field->attribute);
@@ -164,7 +164,7 @@ protected function fillAttributeFromRequest(NovaRequest $request, $requestAttrib
      * @param  array  $rules
      * @return array
      */
-    protected function generateRules($rules)
+    protected function generateRules($rules): array
     {
         return collect($rules)->mapWithKeys(function ($rules, $key) {
             return [$this->attribute . ($key ? '.' . $key : '') => $rules];
@@ -178,7 +178,7 @@ protected function generateRules($rules)
      * @param  string|null  $attribute
      * @return void
      */
-    public function resolveForDisplay($resource, $attribute = null)
+    public function resolveForDisplay($resource, $attribute = null): void
     {
         $attribute = $attribute ?? $this->attribute;
 
@@ -196,7 +196,7 @@ public function resolveForDisplay($resource, $attribute = null)
      *
      * @return array
      */
-    public function jsonSerialize()
+    public function jsonSerialize(): array
     {
         return array_merge(parent::jsonSerialize(), [
             'panelTitleClasses' => $this->panelTitleClasses,
diff --git a/src/Number.php b/src/Number.php
index c6a4587e..16acd907 100644
--- a/src/Number.php
+++ b/src/Number.php
@@ -35,7 +35,7 @@ class Number extends NovaNumber
      *
      * @return $this
      */
-    public function colors()
+    public function colors(): Number
     {
         return $this->withMeta(['colors' => true]);
     }
diff --git a/src/Password.php b/src/Password.php
index 241ab468..ee9a742d 100644
--- a/src/Password.php
+++ b/src/Password.php
@@ -36,7 +36,7 @@ class Password extends NovaPassword
      * @param  string  $placeholder
      * @return $this
      */
-    public function maskLabel($label)
+    public function maskLabel($label): Password
     {
         return $this->withMeta(['maskLabel' => $label]);
     }
diff --git a/src/Row.php b/src/Row.php
index 8370c775..b4a3ac38 100644
--- a/src/Row.php
+++ b/src/Row.php
@@ -2,6 +2,7 @@
 
 namespace R64\NovaFields;
 
+use Illuminate\Support\Collection;
 use Illuminate\Support\Str;
 use Laravel\Nova\Fields\Field;
 use Laravel\Nova\Fields\Expandable;
@@ -116,7 +117,7 @@ public function __construct($name, $fields, $attribute = null, $resolveCallback
      *
      * @return $this
      */
-    public function hideHeading()
+    public function hideHeading(): Row
     {
         return $this->withMeta(['hideHeading' => true]);
     }
@@ -126,7 +127,7 @@ public function hideHeading()
      *
      * @return $this
      */
-    public function hideHeadingWhenEmpty()
+    public function hideHeadingWhenEmpty(): Row
     {
         return $this->withMeta(['hideHeadingWhenEmpty' => true]);
     }
@@ -136,7 +137,7 @@ public function hideHeadingWhenEmpty()
      *
      * @return $this
      */
-    public function sum($field)
+    public function sum($field): Row
     {
         return $this->withMeta(['sum' => $field]);
     }
@@ -146,7 +147,7 @@ public function sum($field)
      *
      * @return $this
      */
-    public function hideSumWhenEmpty()
+    public function hideSumWhenEmpty(): Row
     {
         return $this->withMeta(['hideSumWhenEmpty' => true]);
     }
@@ -156,7 +157,7 @@ public function hideSumWhenEmpty()
      *
      * @return $this
      */
-    public function prepopulateRowWhenEmpty()
+    public function prepopulateRowWhenEmpty(): Row
     {
         return $this->withMeta(['prepopulateRowWhenEmpty' => true]);
     }
@@ -166,7 +167,7 @@ public function prepopulateRowWhenEmpty()
      *
      * @return $this
      */
-    public function maxRows($rows)
+    public function maxRows($rows): Row
     {
         return $this->withMeta(['maxRows' => $rows]);
     }
@@ -176,7 +177,7 @@ public function maxRows($rows)
      * @param  string  $name
      * @return $this
      */
-    public function addRowText($text)
+    public function addRowText($text): Row
     {
         return $this->withMeta(['addRowText' => $text]);
     }
@@ -187,7 +188,7 @@ public function addRowText($text)
      * @param  string  $classes
      * @return $this
      */
-    public function headingClasses($classes)
+    public function headingClasses($classes): Row
     {
         $this->headingClasses = $classes;
 
@@ -200,7 +201,7 @@ public function headingClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function itemWrapperClasses($classes)
+    public function itemWrapperClasses($classes): Row
     {
         $this->itemWrapperClasses = $classes;
 
@@ -213,7 +214,7 @@ public function itemWrapperClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function deleteButtonClasses($classes)
+    public function deleteButtonClasses($classes): Row
     {
         $this->deleteButtonClasses = $classes;
 
@@ -226,7 +227,7 @@ public function deleteButtonClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function sumWrapperClasses($classes)
+    public function sumWrapperClasses($classes): Row
     {
         $this->sumWrapperClasses = $classes;
 
@@ -239,7 +240,7 @@ public function sumWrapperClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function sumFieldClasses($classes)
+    public function sumFieldClasses($classes): Row
     {
         $this->sumFieldClasses = $classes;
 
@@ -252,7 +253,7 @@ public function sumFieldClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function addRowButtonClasses($classes)
+    public function addRowButtonClasses($classes): Row
     {
         $this->addRowButtonClasses = $classes;
 
@@ -265,7 +266,7 @@ public function addRowButtonClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function rowWrapperClasses($classes)
+    public function rowWrapperClasses($classes): Row
     {
         $this->rowWrapperClasses = $classes;
 
@@ -278,7 +279,7 @@ public function rowWrapperClasses($classes)
      * @param  string  $classes
      * @return $this
      */
-    public function useWrapperClassesInHeading()
+    public function useWrapperClassesInHeading(): Row
     {
         return $this->withMeta(['useWrapperClassesInHeading' => true]);
     }
@@ -290,7 +291,7 @@ public function useWrapperClassesInHeading()
      * @param  string|null  $attribute
      * @return void
      */
-    public function resolve($resource, $attribute = null)
+    public function resolve($resource, $attribute = null): void
     {
         $attribute = $attribute ?? $this->attribute;
 
@@ -338,7 +339,7 @@ public function resolve($resource, $attribute = null)
      * @param  array  $rules
      * @return array
      */
-    protected function generateRules($rules)
+    protected function generateRules($rules): array
     {
         return collect($rules)->mapWithKeys(function ($rules, $key) {
             return [$this->attribute . '.*.' . $key => $rules];
@@ -351,7 +352,7 @@ protected function generateRules($rules)
      * @param  array  $fields
      * @return Collection
      */
-    protected function prepareFields($fields)
+    protected function prepareFields($fields): Collection
     {
         return collect($fields)->each(function($field) {
             if($field->isReadonly(app(NovaRequest::class))) {
@@ -377,7 +378,7 @@ protected function prepareFields($fields)
      *
      * @return array
      */
-    public function jsonSerialize()
+    public function jsonSerialize(): array
     {
         return array_merge(parent::jsonSerialize(), [
             'sanitizedAttribute' => Str::plural(Str::kebab($this->attribute)),
diff --git a/src/Select.php b/src/Select.php
index 95267fc4..687a4487 100644
--- a/src/Select.php
+++ b/src/Select.php
@@ -34,7 +34,7 @@ class Select extends NovaSelect
      *
      * @return $this
      */
-    public function displayUsingLabels()
+    public function displayUsingLabels(): Select
     {
         $this->displayUsing(function ($value) {
             return collect($this->meta['options'])
diff --git a/src/Textarea.php b/src/Textarea.php
index 0e5a5ebd..f3cd0d5a 100644
--- a/src/Textarea.php
+++ b/src/Textarea.php
@@ -35,7 +35,7 @@ class Textarea extends NovaTextarea
      * @param  string  $label
      * @return $this
      */
-    public function showContentLabel($label)
+    public function showContentLabel($label): Textarea
     {
         return $this->withMeta(['showContentLabel' => $label]);
     }
@@ -46,7 +46,7 @@ public function showContentLabel($label)
      * @param  string  $label
      * @return $this
      */
-    public function hideContentLabel($label)
+    public function hideContentLabel($label): Textarea
     {
         return $this->withMeta(['hideContentLabel' => $label]);
     }