diff --git a/setup.py b/setup.py
index 38833f8..a65ea44 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,8 @@
 package_json = {
     "dependencies": {},
     "devDependencies": {
-        "webpack": "~2.7.0",
+        "webpack": "~4.16.0",
+        "webpack-cli": "~3.0.0",
         "karma-webpack": "~3.0.0",
         "sourcemap-istanbul-instrumenter-loader": "~0.2.0",
     }
@@ -69,6 +70,7 @@
     include_package_data=True,
     zip_safe=False,
     install_requires=[
+        'calmjs.parse>=1.2.0',
         'calmjs>=3.3.1',
     ],
     extras_require={
diff --git a/src/calmjs/webpack/dev.py b/src/calmjs/webpack/dev.py
index 95ff421..aae44c3 100644
--- a/src/calmjs/webpack/dev.py
+++ b/src/calmjs/webpack/dev.py
@@ -412,7 +412,7 @@ def karma_webpack(spec, toolchain=None):
             "mode": spec.get(WEBPACK_MODE, DEFAULT_WEBPACK_MODE),
             "devtool": spec.get(WEBPACK_DEVTOOL, DEFAULT_WEBPACK_DEVTOOL),
             "output": {
-                "filename": "dummy.webpack.js",
+                "filename": "__calmjs_karma__.webpack.js",
                 "library": "__calmjs_karma__",
                 "libraryTarget": "umd",
                 "path": spec[BUILD_DIR],
diff --git a/src/calmjs/webpack/toolchain.py b/src/calmjs/webpack/toolchain.py
index c1d1804..2e62382 100644
--- a/src/calmjs/webpack/toolchain.py
+++ b/src/calmjs/webpack/toolchain.py
@@ -196,7 +196,7 @@ def __init__(self, *a, **kw):
         self.binary = self.webpack_bin
 
     def setup_transpiler(self):
-        self.parser = parse
+        self.parser = partial(parse, with_comments=True)
         self.transpiler = convert_dynamic_require_unparser()
 
     def build_compile_entries(self):