diff --git a/composer.json b/composer.json
index e582d1bb2..dad8801da 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "composer/composer": "^1.2.0",
+        "composer/composer": ">=1.2.0 <1.7.0 || ^1.7.1",
         "wp-cli/wp-cli": "^2"
     },
     "require-dev": {