diff --git a/package-lock.json b/package-lock.json
index 7069819..1e85557 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -741,6 +741,7 @@
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
       "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
       "dev": true,
+      "optional": true,
       "requires": {
         "kind-of": "^3.0.2",
         "longest": "^1.0.1",
@@ -3439,17 +3440,17 @@
       }
     },
     "del": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/del/-/del-3.0.0.tgz",
-      "integrity": "sha1-U+z2mf/LyzljdpGrE7rxYIGXZuU=",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/del/-/del-4.0.0.tgz",
+      "integrity": "sha512-/BnSJ+SuZyLu7xMn48kZY0nMXDi+5KNmR4g8n21Wivsl8+B9njV6/5kcTNE9juSprp0zRWBU28JuHUq0FqK1Nw==",
       "dev": true,
       "requires": {
         "globby": "^6.1.0",
-        "is-path-cwd": "^1.0.0",
-        "is-path-in-cwd": "^1.0.0",
-        "p-map": "^1.1.1",
-        "pify": "^3.0.0",
-        "rimraf": "^2.2.8"
+        "is-path-cwd": "^2.0.0",
+        "is-path-in-cwd": "^2.0.0",
+        "p-map": "^2.0.0",
+        "pify": "^4.0.1",
+        "rimraf": "^2.6.2"
       },
       "dependencies": {
         "globby": {
@@ -3467,16 +3468,16 @@
           "dependencies": {
             "pify": {
               "version": "2.3.0",
-              "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
+              "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz",
               "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=",
               "dev": true
             }
           }
         },
         "pify": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
-          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+          "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
           "dev": true
         }
       }
@@ -4987,12 +4988,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -5007,17 +5010,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -5134,7 +5140,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -5146,6 +5153,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -5160,6 +5168,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -5167,12 +5176,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -5191,6 +5202,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -5271,7 +5283,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -5283,6 +5296,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5404,6 +5418,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -7819,15 +7834,15 @@
       "dev": true
     },
     "is-path-cwd": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-1.0.0.tgz",
-      "integrity": "sha1-0iXsIxMuie3Tj9p2dHLmLmXxEG0=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.0.0.tgz",
+      "integrity": "sha512-m5dHHzpOXEiv18JEORttBO64UgTEypx99vCxQLjbBvGhOJxnTNglYoFXxwo6AbsQb79sqqycQEHv2hWkHZAijA==",
       "dev": true
     },
     "is-path-in-cwd": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-1.0.1.tgz",
-      "integrity": "sha512-FjV1RTW48E7CWM7eE/J2NJvAEEVektecDBVBE5Hh3nM1Jd0kvhHtX68Pr3xsDf857xt3Y4AkwVULK1Vku62aaQ==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/is-path-in-cwd/-/is-path-in-cwd-2.0.0.tgz",
+      "integrity": "sha512-6Vz5Gc9s/sDA3JBVu0FzWufm8xaBsqy1zn8Q6gmvGP6nSDMw78aS4poBNeatWjaRpTpxxLn1WOndAiOlk+qY8A==",
       "dev": true,
       "requires": {
         "is-path-inside": "^1.0.0"
@@ -9296,7 +9311,8 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/longest/-/longest-1.0.1.tgz",
       "integrity": "sha1-MKCy2jj3N3DoKUoNIuZiXtd9AJc=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "loose-envify": {
       "version": "1.4.0",
@@ -10865,9 +10881,9 @@
       }
     },
     "p-map": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/p-map/-/p-map-1.2.0.tgz",
-      "integrity": "sha512-r6zKACMNhjPJMTl8KcFH4li//gkrXWfbD6feV8l6doRHlzljFWGJ2AP6iKaCJXyZmAUMOPtvbW7EXkbWO/pLEA==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/p-map/-/p-map-2.0.0.tgz",
+      "integrity": "sha512-GO107XdrSUmtHxVoi60qc9tUl/KkNKm+X2CF4P9amalpGxv5YqVPJNfSb0wcA+syCopkZvYYIzW8OVTQW59x/w==",
       "dev": true
     },
     "p-timeout": {
diff --git a/package.json b/package.json
index 0774887..8840db4 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "core-js": "2.5.7",
     "css-loader": "^1.0.0",
     "cssnano": "^4.1.7",
-    "del": "3.0.0",
+    "del": "4.0.0",
     "gulp": "3.9.1",
     "gulp-bump": "3.1.1",
     "gulp-conventional-changelog": "^2.0.3",