diff --git a/composer.json b/composer.json
index 3ecadaa..d59ad2b 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         "ext-json":                  "*",
         "composer-plugin-api":       "^2.1.0",
         "ocramius/package-versions": "^2.8.0",
-        "vimeo/psalm":               "^5.23.1",
+        "vimeo/psalm":               "^6.14.1",
         "psalm/plugin-phpunit": "^0.19.0"
     },
     "require-dev": {