diff --git a/package-lock.json b/package-lock.json
index 7c063fa..db0db72 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -733,8 +733,7 @@
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
-      "dev": true
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
     "fsevents": {
       "version": "1.1.3",
@@ -1539,7 +1538,6 @@
       "version": "7.1.2",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
       "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
-      "dev": true,
       "requires": {
         "fs.realpath": "1.0.0",
         "inflight": "1.0.6",
@@ -1639,7 +1637,6 @@
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
       "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
-      "dev": true,
       "requires": {
         "once": "1.4.0",
         "wrappy": "1.0.2"
@@ -2079,7 +2076,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
-      "dev": true,
       "requires": {
         "wrappy": "1.0.2"
       }
@@ -2395,6 +2391,14 @@
         "align-text": "0.1.4"
       }
     },
+    "rimraf": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
+      "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
+      "requires": {
+        "glob": "7.1.2"
+      }
+    },
     "ripemd160": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.1.tgz",
@@ -2819,8 +2823,7 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
     "xtend": {
       "version": "4.0.1",
diff --git a/package.json b/package.json
index 0b2c4e5..4639872 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
   },
   "dependencies": {
     "@std/esm": "^0.18.0",
+    "rimraf": "^2.6.2",
     "webpack": "^3.10.0"
   },
   "devDependencies": {