diff --git a/package.json b/package.json
index 4211a65f5e..c65b6cef6f 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "babel-register": "^6.23.0",
     "codecov": "^1.0.1",
     "console-group": "^0.3.2",
-    "css-tree": "^1.0.0-alpha16",
+    "css-tree": "1.0.0-alpha16",
     "eslint": "^3.12.2",
     "eslint-plugin-import": "^2.2.0",
     "estree-walker": "^0.3.0",