diff --git a/package-lock.json b/package-lock.json
index 0eb9c76..7cc8605 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,69 @@
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+        "normalize-path": "^3.0.0",
+        "postcss": "^7.0.16",
+        "source-map": "^0.6.0",
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+          "dev": true,
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+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
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+          "dev": true,
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+          "resolved": "https://registry.npmjs.org/through2/-/through2-3.0.2.tgz",
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+          "dev": true,
+          "requires": {
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+            "readable-stream": "2 || 3"
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@@ -15,9 +78,9 @@
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-      "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
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@@ -486,6 +549,21 @@
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+      "dev": true,
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+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
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@@ -580,6 +667,16 @@
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+      "dev": true,
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@@ -596,20 +693,35 @@
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-      "integrity": "sha1-+gccXYdIRoVCSAdCHKSxawsaB2M=",
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-        "lazy-debug-legacy": "0.0.X",
-        "object-assign": "4.1.0"
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+        "memoizee": "0.4.X",
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-          "integrity": "sha1-ejs9DpgGPUP0wD8uiubNUahog6A=",
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@@ -812,12 +924,74 @@
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+          "integrity": "sha1-yobR/ogoFpsBICCOPchCS524NCw=",
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@@ -940,6 +1114,23 @@
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-        "through2": "2.X",
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+      "resolved": "https://registry.npmjs.org/memoizee/-/memoizee-0.4.14.tgz",
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+      "resolved": "https://registry.npmjs.org/next-tick/-/next-tick-1.1.0.tgz",
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@@ -3437,6 +3639,71 @@
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+    "postcss": {
+      "version": "7.0.35",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.35.tgz",
+      "integrity": "sha512-3QT8bBJeX/S5zKTTjTCIjRF3If4avAT6kqxcASlTWEtAFCb9NH0OUxNDfgZSWdP5fJnBYCMEWkIFfWeugjzYMg==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.4.2",
+        "source-map": "^0.6.1",
+        "supports-color": "^6.1.0"
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+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
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+          "dev": true,
+          "requires": {
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+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
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+              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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+              "dev": true,
+              "requires": {
+                "has-flag": "^3.0.0"
+              }
+            }
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+        },
+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
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       "resolved": "https://registry.npmjs.org/preserve/-/preserve-0.2.0.tgz",
@@ -4099,6 +4366,12 @@
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom-string/-/strip-bom-string-1.0.0.tgz",
+      "integrity": "sha1-5SEekiQ2n7uB1jOi8ABE3IztrZI=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
@@ -4197,6 +4470,16 @@
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       "dev": true
     },
+    "timers-ext": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/timers-ext/-/timers-ext-0.1.7.tgz",
+      "integrity": "sha512-b85NUNzTSdodShTIbky6ZF02e8STtVVfD+fu4aXXShEELpozH+bCpJLYMPZbsABN2wDH7fJpqIoXxJpzbf0NqQ==",
+      "dev": true,
+      "requires": {
+        "es5-ext": "~0.10.46",
+        "next-tick": "1"
+      }
+    },
     "to-absolute-glob": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/to-absolute-glob/-/to-absolute-glob-0.1.1.tgz",
@@ -4265,6 +4548,12 @@
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       "dev": true
     },
+    "type": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/type/-/type-1.2.0.tgz",
+      "integrity": "sha512-+5nt5AAniqsCnu2cEQQdpzCAh33kVx8n0VoFidKpB1dVVLAN/F+bgVOqOJqOnEnrhp222clB5p3vUlD+1QAnfg==",
+      "dev": true
+    },
     "type-detect": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-1.0.0.tgz",
diff --git a/package.json b/package.json
index 1c654d2..ae838a1 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
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     "gulp-mocha": "^3.0.1",
     "gulp-prompt": "^0.2.0",
-    "gulp-sourcemaps": "^1.6.0",
+    "gulp-sourcemaps": "^3.0.0",
     "gulp-tag-version": "^1.3.0",
     "gulp-typescript": "^2.13.6",
     "gulp-util": "^3.0.7",