diff --git a/composer.json b/composer.json
index 4fa1d99..f0ae071 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "^7|^8|^9",
-    "vimeo/psalm": "^1|^3|^4"
+    "vimeo/psalm": "^1|^3|^4|^5"
   },
   "scripts": {
     "test": ["phpunit", "psalm"]