diff --git a/composer.json b/composer.json
index 66dced3..f5e7d6b 100644
--- a/composer.json
+++ b/composer.json
@@ -81,6 +81,9 @@
             "dev-master": "1.0-dev"
         }
     },
+    "conflict": {
+        "doctrine/data-fixtures": "1.4.*"
+    },
     "scripts": {
         "analyse": "psalm",
         "check-style": "ecs check",