diff --git a/composer.json b/composer.json
index e9835b3..5208bff 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     }
   ],
   "require": {
-    "php": "^7.0",
+    "php": "^7.1",
     "mongodb/mongodb": "^1",
     "makasim/values": "^0.3.3",
     "mikemccabe/json-patch-php": "^0.1"