diff --git a/package.json b/package.json
index ff93b74..49e0993 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "d3": "^3.5.12",
     "d3-tip": "^0.6.7",
     "es6-promise": "^3.0.2",
-    "heatmap.js": "^2.0.1",
+    "heatmap.js": "2.0.1",
     "isomorphic-fetch": "^2.2.0",
     "jquery-browserify": "^1.8.1",
     "moment": "^2.10.6",