diff --git a/composer.json b/composer.json
index 3e4705e4..fed3ebe5 100644
--- a/composer.json
+++ b/composer.json
@@ -44,7 +44,7 @@
     "require-dev": {
         "csa/guzzle-cache-middleware": "^1.0",
         "mockery/mockery": "^0.9.5",
-        "phpunit/phpunit": "^5.5",
+        "phpunit/phpunit": "^11.0",
         "squizlabs/php_codesniffer": "^3.5",
         "symfony/browser-kit": "^3.1",
         "symfony/var-dumper": "^3.1"