diff --git a/composer.json b/composer.json
index 42d22ee..5191058 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "tobyz/json-api-server",
     "description": "A fully automated JSON:API server implementation in PHP.",
     "require": {
-        "php": "^7.2",
+        "php": "^7.2|^8.0",
         "doctrine/inflector": "^1.3",
         "json-api-php/json-api": "^2.2",
         "nyholm/psr7": "^1.3",
@@ -31,9 +31,10 @@
         }
     },
     "require-dev": {
-        "dms/phpunit-arraysubset-asserts": "^0.1.0",
+        "dms/phpunit-arraysubset-asserts": "^0.2",
         "helmich/phpunit-json-assert": "^3.0",
-        "phpunit/phpunit": "^8.0"
+        "phpspec/prophecy-phpunit": "^2.0",
+        "phpunit/phpunit": "^9.0"
     },
     "scripts": {
         "test": "phpunit"
diff --git a/src/Endpoint/Index.php b/src/Endpoint/Index.php
index e4ad427..29ae018 100644
--- a/src/Endpoint/Index.php
+++ b/src/Endpoint/Index.php
@@ -249,7 +249,7 @@ class Index
                 continue;
             }
 
-            if (isset($filters[$name]) && evaluate($filters[$name]->getVisible(), [$this->context])) {
+            if (isset($filters[$name]) && evaluate($filters[$name]->getVisible(), [$context])) {
                 $filters[$name]->getCallback()($query, $value, $context);
                 continue;
             }
diff --git a/tests/feature/CreateTest.php b/tests/feature/CreateTest.php
index b70605e..db82dc9 100644
--- a/tests/feature/CreateTest.php
+++ b/tests/feature/CreateTest.php
@@ -11,6 +11,7 @@
 
 namespace Tobyz\Tests\JsonApiServer\feature;
 
+use Prophecy\PhpUnit\ProphecyTrait;
 use Tobyz\JsonApiServer\Adapter\AdapterInterface;
 use Tobyz\JsonApiServer\Exception\ForbiddenException;
 use Tobyz\JsonApiServer\JsonApi;
@@ -21,6 +22,8 @@ use Tobyz\Tests\JsonApiServer\MockAdapter;
 
 class CreateTest extends AbstractTestCase
 {
+    use ProphecyTrait;
+
     /**
      * @var JsonApi
      */
diff --git a/tests/feature/DeleteTest.php b/tests/feature/DeleteTest.php
index cef40dd..11bed6c 100644
--- a/tests/feature/DeleteTest.php
+++ b/tests/feature/DeleteTest.php
@@ -11,7 +11,7 @@
 
 namespace Tobyz\Tests\JsonApiServer\feature;
 
-use Psr\Http\Message\ServerRequestInterface;
+use Prophecy\PhpUnit\ProphecyTrait;
 use Tobyz\JsonApiServer\Adapter\AdapterInterface;
 use Tobyz\JsonApiServer\Exception\ForbiddenException;
 use Tobyz\JsonApiServer\JsonApi;
@@ -22,6 +22,8 @@ use Tobyz\Tests\JsonApiServer\MockAdapter;
 
 class DeleteTest extends AbstractTestCase
 {
+    use ProphecyTrait;
+
     /**
      * @var JsonApi
      */