diff --git a/composer.json b/composer.json
index 0b5c3a9..e2bb182 100755
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "composer/semver": "^1.4 || ^2.0 || ^3.0",
         "composer/package-versions-deprecated": "^1.10",
         "phpunit/phpunit": "^7.5 || ^8.0 || ^9.0",
-        "vimeo/psalm": "dev-master || dev-4.x"
+        "vimeo/psalm": "dev-master || dev-4.x || 4.0.0-beta1"
     },
     "require-dev": {
         "codeception/codeception": "^4.0.3",