diff --git a/composer.json b/composer.json
index 83c560da..f113980d 100644
--- a/composer.json
+++ b/composer.json
@@ -31,6 +31,7 @@
     "require-dev": {
         "brainmaestro/composer-git-hooks": "^3.0",
         "friendsofphp/php-cs-fixer": "^3.2 != 3.7.0",
+        "jangregor/phpstan-prophecy": "^1.0",
         "jetbrains/phpstorm-attributes": "^1.0",
         "mikey179/vfsstream": "^1.6",
         "phpspec/prophecy": "1.x-dev",