diff --git a/package-lock.json b/package-lock.json
index 6da2493..c6fcf5a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -71,6 +71,15 @@
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       "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768="
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-      "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA="
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@@ -119,6 +139,37 @@
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       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
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+      "resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
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+      "resolved": "https://registry.npmjs.org/array-last/-/array-last-1.3.0.tgz",
+      "integrity": "sha512-eOCut5rXlI6aCOS7Z7kCplKRKyiFQ6dHFBem4PwlwKeNFk2/XxTrhRh5T9PyaEWGy/NHTZWbY+nsZlNFJu9rYg==",
+      "requires": {
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@@ -141,15 +192,10 @@
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-      "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg="
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@@ -210,6 +256,19 @@
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+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ=="
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+      "resolved": "https://registry.npmjs.org/async-settle/-/async-settle-1.0.0.tgz",
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-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+    "bach": {
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+      "resolved": "https://registry.npmjs.org/bach/-/bach-1.2.0.tgz",
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@@ -849,38 +928,29 @@
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@@ -965,6 +1035,45 @@
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+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
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@@ -1567,6 +1647,54 @@
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@@ -6326,11 +6298,11 @@
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
     "v8flags": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
-      "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.2.0.tgz",
+      "integrity": "sha512-mH8etigqMfiGWdeXpaaqGfs6BndypxusHHcv2qSHyZkGEznCd/qAXCWWRzeowtL54147cktFOC4P5y+kl8d8Jg==",
       "requires": {
-        "user-home": "1.1.1"
+        "homedir-polyfill": "^1.0.1"
       }
     },
     "validate-npm-package-license": {
@@ -6362,16 +6334,6 @@
         "extsprintf": "1.3.0"
       }
     },
-    "vinyl": {
-      "version": "0.5.3",
-      "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-0.5.3.tgz",
-      "integrity": "sha1-sEVbOPxeDPMNQyUTLkYZcMIJHN4=",
-      "requires": {
-        "clone": "1.0.4",
-        "clone-stats": "0.0.1",
-        "replace-ext": "0.0.1"
-      }
-    },
     "vinyl-fs": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/vinyl-fs/-/vinyl-fs-3.0.3.tgz",
@@ -6525,7 +6487,7 @@
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "which-module": {
diff --git a/package.json b/package.json
index b46d31e..a53afc8 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "chai": "^3.5.0",
     "express": "^4.16.4",
     "express-ws": "2.0.0-rc.1",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.2",
     "gulp-babel": "^6.1.3",
     "gulp-batch": "^1.0.5",
     "gulp-cli": "^2.0.1",