diff --git a/composer.json b/composer.json
index 37732c84c..01f9bfefc 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,8 @@
         "wikimedia/composer-merge-plugin": "1.4.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0|^9.0",
+        "phpunit/phpunit": "^8.4|^9.3.3",
+        "mockery/mockery": "~1.3.3|^1.4.2",
         "fzaninotto/faker": "~1.9",
         "squizlabs/php_codesniffer": "3.*",
         "php-parallel-lint/php-parallel-lint": "^1.0",