diff --git a/package.json b/package.json
index 2b79f6cf..b52f7790 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "steal-bundler": "^0.3.6",
     "steal-parse-amd": "^1.0.0",
     "steal-rollup": "^0.58.3",
-    "through2": "^2.0.0",
+    "through2": "^3.0.0",
     "tmp": "0.0.33",
     "traceur": "0.0.111",
     "transpile": "^2.6.1",