diff --git a/composer.json b/composer.json
index d4d0c1a..12eb8b1 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^7.4||^6.5.13||^5.7.27||^4.8.36",
-        "vimeo/psalm": "^3.4.10|dev-master",
+        "vimeo/psalm": "^3.4.10",
         "friendsofphp/php-cs-fixer": "^2.13",
         "infection/infection": "^0.12.0"
     },