diff --git a/composer.json b/composer.json
index 13e40a1..752f17f 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,6 @@
     "proprietary"
   ],
   "require": {
-    "d3/importer": "^5.1"
+    "d3/importer": "^5.0"
   }
 }