diff --git a/composer.json b/composer.json
index 4ac909c..0aee4f8 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
         "php": ">=7.1.0",
         "ext-mbstring": "*",
         "ext-json": "*",
-        "justinrainbow/json-schema": "^5.2.10",
+        "justinrainbow/json-schema": "^6.6",
         "nesbot/carbon": "^2.63.0",
         "jmikola/geojson": "^1.0"
     },
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index ffe54a2..30f43ba 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,20 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/7.5/phpunit.xsd"
-         bootstrap="vendor/autoload.php">
-    <php>
-        <ini name="display_errors" value="On" />
-        <ini name="error_reporting" value="24575" />
-    </php>
-    <testsuites>
-        <testsuite name="default">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" bootstrap="vendor/autoload.php">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">src</directory>
+    </include>
+  </coverage>
+  <php>
+    <ini name="display_errors" value="On"/>
+    <ini name="error_reporting" value="24575"/>
+  </php>
+  <testsuites>
+    <testsuite name="default">
+      <directory>tests</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>
diff --git a/tests/SchemaTest.php b/tests/SchemaTest.php
index 30dc1e1..499fe48 100644
--- a/tests/SchemaTest.php
+++ b/tests/SchemaTest.php
@@ -584,9 +584,14 @@ public function testSpecsUriFormat(): void
             'pointer' => '/0',
             // it considers file names to be invalid uris
             'message' => 'Invalid URL format',
-            'constraint' => 'format',
-            'context' => 1,
-            'format' => 'uri',
+            // Constraint errors are arrays since justinrainbow/json-schema:^6
+            'constraint' => [
+                'name' => 'urlFormat',
+                'params' => [
+                    'format' => 'uri'
+                ],
+            ],
+            'context' => 1
         ]], $validator->getErrors());
     }