diff --git a/index.js b/index.js
index 8da21f4..ab3fa66 100644
--- a/index.js
+++ b/index.js
@@ -125,7 +125,7 @@ module.exports = function(opt) {
     };
 
     try {
-      mangled = uglify.minify(String(file.contents), uglifyOptions);
+      mangled = await uglify.minify(String(file.contents), uglifyOptions);
       min_file.contents = new Buffer(mangled.code.replace(reSourceMapComment, ''));
     } catch (e) {
       this.emit('end');
diff --git a/package.json b/package.json
index 5616209..ce53c5e 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "ansi-colors": "^1.0.1",
     "minimatch": "^3.0.2",
     "plugin-error": "^0.1.2",
-    "terser": "^3.7.6",
+    "terser": "^5.5.1",
     "through2": "^2.0.3",
     "vinyl": "^2.1.0"
   },