diff --git a/package.json b/package.json
index 3780ee0b..47ebee8f 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "jsdom": "9.8.3",
     "mocha": "3.2.0",
     "nyc": "10.0.0",
-    "prop-types": "15.6.0",
+    "prop-types": "^15.6.0",
     "react": "16.2.0",
     "react-dom": "16.2.0",
     "react-style-sheets": "0.1.0",