diff --git a/wct-browser-legacy/package.json b/wct-browser-legacy/package.json
index 60838b0b..dc268faf 100644
--- a/wct-browser-legacy/package.json
+++ b/wct-browser-legacy/package.json
@@ -32,7 +32,7 @@
     "accessibility-developer-tools": "^2.12.0",
     "async": "^1.5.2",
     "chai": "^3.5.0",
-    "lodash": "^3.10.1",
+    "lodash": "^4.17.15",
     "mocha": "^3.4.2",
     "sinon": "^1.17.1",
     "sinon-chai": "^2.10.0",