diff --git a/composer.json b/composer.json
index 77c2933..bcec579 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "homepage": "https://polderknowledge.com",
     "require": {
         "php": "~5.5|~7.0",
-        "polderknowledge/entityservice": "^3.0"
+        "polderknowledge/entityservice": "^3.0|^4.0"
     },
     "require-dev": {
         "doctrine/orm": "^2.5",