diff --git a/package.json b/package.json
index f4e5f9c..11acffa 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   "dependencies": {
     "babel-runtime": "^6.23.0",
     "html-webpack-include-assets-plugin": "0.0.5",
-    "read-pkg": "^2.0.0",
+    "read-pkg-up": "^2.0.0",
     "resolve-pkg": "^1.0.0"
   },
   "peerDependencies": {
diff --git a/src/index.js b/src/index.js
index a7fc0d6..4ccf3b0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,5 @@
 import moduleToCdn from 'module-to-cdn';
-import {sync as readPkg} from 'read-pkg';
+import {sync as readPkgUp} from 'read-pkg-up';
 import HtmlWebpackIncludeAssetsPlugin from 'html-webpack-include-assets-plugin';
 import ExternalModule from 'webpack/lib/ExternalModule';
 import resolvePkg from 'resolve-pkg';
@@ -70,7 +70,7 @@ export default class ModulesCdnWebpackPlugin {
             return false;
         }
 
-        const {version, peerDependencies} = readPkg(resolvePkg(modulePath, {cwd: contextPath}));
+        const {version, peerDependencies} = readPkgUp({cwd: resolvePkg(modulePath, {cwd: contextPath})}).pkg;
 
         const cdnConfig = moduleToCdn(modulePath, version, {env});
 
diff --git a/test/core.js b/test/core.js
index 210d158..bce3f14 100644
--- a/test/core.js
+++ b/test/core.js
@@ -330,3 +330,30 @@ test.serial('verbose options to output which modules are loaded from CDN / which
 
     console.log = originalLog;
 });
+
+test('require files without extension', async t => {
+    await cleanDir(path.resolve(__dirname, './fixtures/output/require-file'));
+
+    const stats = await runWebpack({
+        context: path.resolve(__dirname, './fixtures/app'),
+
+        output: {
+            publicPath: '',
+            path: path.resolve(__dirname, './fixtures/output/require-file')
+        },
+
+        entry: {
+            app: './require-file.js'
+        },
+
+        plugins: [
+            new ModulesCdnWebpackPlugin()
+        ]
+    });
+
+    const files = stats.compilation.chunks.reduce((files, x) => files.concat(x.files), []);
+
+    t.is(files.length, 1);
+    t.true(includes(files, 'app.js'));
+    t.false(includes(files, 'https://unpkg.com/react@15.6.1/dist/react.js'));
+});
diff --git a/test/fixtures/app/require-file.js b/test/fixtures/app/require-file.js
new file mode 100644
index 0000000..79a3fd2
--- /dev/null
+++ b/test/fixtures/app/require-file.js
@@ -0,0 +1 @@
+import React from 'react/react';