diff --git a/README.md b/README.md
index 3816a8b..c4de657 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ It can be `m/s` for meter per second, `k/h` for kilometer per hour or `kt` for k
 
 ## Build / watch
 ```shell
-gulp
+npm run watch
 ```
 
 ## Reference
diff --git a/gulpfile.js b/gulpfile.js
index 1a7dd30..b47a811 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -4,10 +4,10 @@ const concat = require("gulp-concat");
 const concatCss = require("gulp-concat-css");
 const rename = require("gulp-rename");
 const uglify = require("gulp-uglify");
-const cssNano = require("gulp-cssnano");
+const postCss = require("gulp-postcss");
 
 // Concatenate & Minify src and dependencies
-gulp.task("scripts", function() {
+gulp.task("scripts", function () {
   return gulp
     .src(["src/js/**.js"])
     .pipe(concat("leaflet-velocity.js"))
@@ -22,27 +22,27 @@ gulp.task("scripts", function() {
     .pipe(gulp.dest("dist"));
 });
 
-gulp.task("concatCss", function() {
+gulp.task("concatCss", function () {
   return gulp
     .src("./src/css/*.css")
     .pipe(concatCss("leaflet-velocity.css"))
     .pipe(gulp.dest("./dist"));
 });
 
-gulp.task("cssNano", ["concatCss"], function() {
-  gulp
+gulp.task("postCss", function () {
+  return gulp
     .src("./dist/leaflet-velocity.css")
-    .pipe(cssNano())
+    .pipe(postCss())
     .pipe(rename({ suffix: ".min" }))
     .pipe(gulp.dest("./dist"));
 });
 
-// Default Task
-gulp.task("default", ["scripts", "concatCss", "cssNano", "watch"]);
-
 // Watch Files For Changes
-gulp.task("watch", function() {
+gulp.task("watch", function () {
   // We watch both JS and HTML files.
-  gulp.watch("src/js/*.js", ["scripts"]);
-  gulp.watch("src/css/*.css", ["concatCss", "cssNano"]);
+  gulp.watch("src/js/*.js", gulp.series("scripts"));
+  gulp.watch("src/css/*.css", gulp.series("concatCss", "postCss"));
 });
+
+// Default Task
+gulp.task('default', gulp.series("scripts", "concatCss", "postCss", "watch"));
diff --git a/package-lock.json b/package-lock.json
index 51ef2b9..6f0e48f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,9 +1,15 @@
 {
   "name": "leaflet-velocity",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@types/q": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/@types/q/-/q-1.5.2.tgz",
+      "integrity": "sha512-ce5d3q03Ex0sy4R14722Rmt6MT07Ua+k4FwDfdcToYJcMKNtRVQvJ6JCAPdAmAnbRb6CsX6aYb9m96NGod9uTw==",
+      "dev": true
+    },
     "align-text": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
@@ -41,6 +47,15 @@
         "ansi-wrap": "^0.1.0"
       }
     },
+    "ansi-cyan": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-cyan/-/ansi-cyan-0.1.1.tgz",
+      "integrity": "sha1-U4rlKK+JgvKK4w2G8vF0VtJgmHM=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-gray": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
@@ -50,6 +65,15 @@
         "ansi-wrap": "0.1.0"
       }
     },
+    "ansi-red": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-red/-/ansi-red-0.1.1.tgz",
+      "integrity": "sha1-jGOPnRCAgAo1PJwoyKgcpHBdlGw=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -68,6 +92,25 @@
       "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
       "dev": true
     },
+    "anymatch": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
+      "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
+      "dev": true,
+      "requires": {
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
+      }
+    },
+    "append-buffer": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/append-buffer/-/append-buffer-1.0.2.tgz",
+      "integrity": "sha1-2CIM9GYIFSXv6lBhTz3mUU36WPE=",
+      "dev": true,
+      "requires": {
+        "buffer-equal": "^1.0.0"
+      }
+    },
     "archy": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
@@ -89,12 +132,30 @@
       "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
       "dev": true
     },
+    "arr-filter": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/arr-filter/-/arr-filter-1.1.2.tgz",
+      "integrity": "sha1-Q/3d0JHo7xGqTEXZzcGOLf8XEe4=",
+      "dev": true,
+      "requires": {
+        "make-iterator": "^1.0.0"
+      }
+    },
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "arr-map": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/arr-map/-/arr-map-2.0.2.tgz",
+      "integrity": "sha1-Onc0X/wc814qkYJWAfnljy4kysQ=",
+      "dev": true,
+      "requires": {
+        "make-iterator": "^1.0.0"
+      }
+    },
     "arr-union": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
@@ -113,12 +174,66 @@
       "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
       "dev": true
     },
+    "array-initial": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
+      "integrity": "sha1-L6dLJnOTccOUe9enrcc74zSz15U=",
+      "dev": true,
+      "requires": {
+        "array-slice": "^1.0.0",
+        "is-number": "^4.0.0"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+          "dev": true
+        }
+      }
+    },
+    "array-last": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/array-last/-/array-last-1.3.0.tgz",
+      "integrity": "sha512-eOCut5rXlI6aCOS7Z7kCplKRKyiFQ6dHFBem4PwlwKeNFk2/XxTrhRh5T9PyaEWGy/NHTZWbY+nsZlNFJu9rYg==",
+      "dev": true,
+      "requires": {
+        "is-number": "^4.0.0"
+      },
+      "dependencies": {
+        "is-number": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+          "integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+          "dev": true
+        }
+      }
+    },
     "array-slice": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
       "integrity": "sha512-B1qMD3RBP7O8o0H2KbrXDyB0IccejMF15+87Lvlor12ONPRHP6gTjXMNkt/d3ZuOGbAe66hFmaCfECI24Ufp6w==",
       "dev": true
     },
+    "array-sort": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-sort/-/array-sort-1.0.0.tgz",
+      "integrity": "sha512-ihLeJkonmdiAsD7vpgN3CRcx2J2S0TiYW+IS/5zHBI7mKUq3ySvBdzzBfD236ubDBQFiiyG3SWCPc+msQ9KoYg==",
+      "dev": true,
+      "requires": {
+        "default-compare": "^1.0.0",
+        "get-value": "^2.0.6",
+        "kind-of": "^5.0.2"
+      },
+      "dependencies": {
+        "kind-of": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
+          "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+          "dev": true
+        }
+      }
+    },
     "array-union": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
@@ -152,26 +267,39 @@
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
-    "atob": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
-      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
+    "async-done": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/async-done/-/async-done-1.3.2.tgz",
+      "integrity": "sha512-uYkTP8dw2og1tu1nmza1n1CMW0qb8gWWlwqMmLb7MhBVs4BXrFziT6HXUd+/RlRA/i4H9AkofYloUbs1fwMqlw==",
+      "dev": true,
+      "requires": {
+        "end-of-stream": "^1.1.0",
+        "once": "^1.3.2",
+        "process-nextick-args": "^2.0.0",
+        "stream-exhaust": "^1.0.1"
+      }
+    },
+    "async-each": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==",
       "dev": true
     },
-    "autoprefixer": {
-      "version": "6.7.7",
-      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-6.7.7.tgz",
-      "integrity": "sha1-Hb0cg1ZY41zj+ZhAmdsAWFx4IBQ=",
+    "async-settle": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-settle/-/async-settle-1.0.0.tgz",
+      "integrity": "sha1-HQqRS7Aldb7IqPOnTlCA9yssDGs=",
       "dev": true,
       "requires": {
-        "browserslist": "^1.7.6",
-        "caniuse-db": "^1.0.30000634",
-        "normalize-range": "^0.1.2",
-        "num2fraction": "^1.2.2",
-        "postcss": "^5.2.16",
-        "postcss-value-parser": "^3.2.3"
+        "async-done": "^1.2.2"
       }
     },
+    "atob": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
+      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
+      "dev": true
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -723,6 +851,23 @@
       "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
       "dev": true
     },
+    "bach": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/bach/-/bach-1.2.0.tgz",
+      "integrity": "sha1-Szzpa/JxNPeaG0FKUcFONMO9mIA=",
+      "dev": true,
+      "requires": {
+        "arr-filter": "^1.1.1",
+        "arr-flatten": "^1.0.1",
+        "arr-map": "^2.0.0",
+        "array-each": "^1.0.0",
+        "array-initial": "^1.0.0",
+        "array-last": "^1.1.1",
+        "async-done": "^1.2.2",
+        "async-settle": "^1.0.0",
+        "now-and-later": "^2.0.0"
+      }
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -790,6 +935,18 @@
       "integrity": "sha1-5tXqjF2tABMEpwsiY4RH9pyy+Ak=",
       "dev": true
     },
+    "binary-extensions": {
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
+      "dev": true
+    },
+    "boolbase": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
+      "integrity": "sha1-aN/1++YMUes3cl6p4+0xDcwed24=",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -830,15 +987,22 @@
       }
     },
     "browserslist": {
-      "version": "1.7.7",
-      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-1.7.7.tgz",
-      "integrity": "sha1-C9dnBCWL6CmyOYu1Dkti0aFmsLk=",
+      "version": "4.6.4",
+      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.6.4.tgz",
+      "integrity": "sha512-ErJT8qGfRt/VWHSr1HeqZzz50DvxHtr1fVL1m5wf20aGrG8e1ce8fpZ2EjZEfs09DDZYSvtRaDlMpWslBf8Low==",
       "dev": true,
       "requires": {
-        "caniuse-db": "^1.0.30000639",
-        "electron-to-chromium": "^1.2.7"
+        "caniuse-lite": "^1.0.30000981",
+        "electron-to-chromium": "^1.3.188",
+        "node-releases": "^1.1.25"
       }
     },
+    "buffer-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-equal/-/buffer-equal-1.0.0.tgz",
+      "integrity": "sha1-WWFrSYME1Var1GaWayLu2j7KX74=",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -862,6 +1026,30 @@
         "unset-value": "^1.0.0"
       }
     },
+    "caller-callsite": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-callsite/-/caller-callsite-2.0.0.tgz",
+      "integrity": "sha1-hH4PzgoiN1CpoCfFSzNzGtMVQTQ=",
+      "dev": true,
+      "requires": {
+        "callsites": "^2.0.0"
+      }
+    },
+    "caller-path": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-2.0.0.tgz",
+      "integrity": "sha1-Ro+DBE42mrIBD6xfBs7uFbsssfQ=",
+      "dev": true,
+      "requires": {
+        "caller-callsite": "^2.0.0"
+      }
+    },
+    "callsites": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-2.0.0.tgz",
+      "integrity": "sha1-BuuE8A7qQT2oav/vrL/7Ngk7PFA=",
+      "dev": true
+    },
     "camelcase": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
@@ -869,21 +1057,21 @@
       "dev": true
     },
     "caniuse-api": {
-      "version": "1.6.1",
-      "resolved": "https://registry.npmjs.org/caniuse-api/-/caniuse-api-1.6.1.tgz",
-      "integrity": "sha1-tTTnxzTE+B7F++isoq0kNUuWLGw=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/caniuse-api/-/caniuse-api-3.0.0.tgz",
+      "integrity": "sha512-bsTwuIg/BZZK/vreVTYYbSWoe2F+71P7K5QGEX+pT250DZbfU1MQ5prOKpPR+LL6uWKK3KMwMCAS74QB3Um1uw==",
       "dev": true,
       "requires": {
-        "browserslist": "^1.3.6",
-        "caniuse-db": "^1.0.30000529",
+        "browserslist": "^4.0.0",
+        "caniuse-lite": "^1.0.0",
         "lodash.memoize": "^4.1.2",
         "lodash.uniq": "^4.5.0"
       }
     },
-    "caniuse-db": {
+    "caniuse-lite": {
       "version": "1.0.30000983",
-      "resolved": "https://registry.npmjs.org/caniuse-db/-/caniuse-db-1.0.30000983.tgz",
-      "integrity": "sha512-LS3aD+ti+fezwo8oN01l5vfZF9/CIN/4pxV5SeakHo5leudiHjE66rVHl+XqoCGw4GpO2u5ab6LOpftTfCN9cw==",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30000983.tgz",
+      "integrity": "sha512-/llD1bZ6qwNkt41AsvjsmwNOoA4ZB+8iqmf5LVyeSXuBODT/hAMFNVOh84NdUzoiYiSKqo5vQ3ZzeYHSi/olDQ==",
       "dev": true
     },
     "center-align": {
@@ -909,13 +1097,32 @@
         "supports-color": "^2.0.0"
       }
     },
-    "clap": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/clap/-/clap-1.2.3.tgz",
-      "integrity": "sha512-4CoL/A3hf90V3VIEjeuhSvlGFEHKzOz+Wfc2IVZc+FaUgU0ZQafJTP49fvnULipOPcAfqhyI2duwQyns6xqjYA==",
+    "chokidar": {
+      "version": "2.1.6",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.6.tgz",
+      "integrity": "sha512-V2jUo67OKkc6ySiRpJrjlpJKl9kDuG+Xb8VgsGzb+aEouhgS1D0weyPU4lEzdAcsCAvrih2J2BqyXqHWvVLw5g==",
       "dev": true,
       "requires": {
-        "chalk": "^1.1.3"
+        "anymatch": "^2.0.0",
+        "async-each": "^1.0.1",
+        "braces": "^2.3.2",
+        "fsevents": "^1.2.7",
+        "glob-parent": "^3.1.0",
+        "inherits": "^2.0.3",
+        "is-binary-path": "^1.0.0",
+        "is-glob": "^4.0.0",
+        "normalize-path": "^3.0.0",
+        "path-is-absolute": "^1.0.0",
+        "readdirp": "^2.2.1",
+        "upath": "^1.1.1"
+      },
+      "dependencies": {
+        "normalize-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
+          "integrity": "sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==",
+          "dev": true
+        }
       }
     },
     "class-utils": {
@@ -1014,12 +1221,62 @@
       }
     },
     "coa": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/coa/-/coa-1.0.4.tgz",
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+          "dev": true,
+          "requires": {
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+            "clone-buffer": "^1.0.0",
+            "clone-stats": "^1.0.0",
+            "cloneable-readable": "^1.0.0",
+            "remove-trailing-separator": "^1.0.1",
+            "replace-ext": "^1.0.0"
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+        }
+      }
+    },
+    "vinyl-sourcemap": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/vinyl-sourcemap/-/vinyl-sourcemap-1.1.0.tgz",
+      "integrity": "sha1-kqgAWTo4cDqM2xHYswCtS+Y7PhY=",
+      "dev": true,
+      "requires": {
+        "append-buffer": "^1.0.2",
+        "convert-source-map": "^1.5.0",
+        "graceful-fs": "^4.1.6",
+        "normalize-path": "^2.1.1",
+        "now-and-later": "^2.0.0",
+        "remove-bom-buffer": "^3.0.0",
+        "vinyl": "^2.0.0"
+      },
+      "dependencies": {
+        "clone": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+          "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18=",
+          "dev": true
+        },
+        "clone-stats": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/clone-stats/-/clone-stats-1.0.0.tgz",
+          "integrity": "sha1-s3gt/4u1R04Yuba/D9/ngvh3doA=",
+          "dev": true
+        },
+        "replace-ext": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+          "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
+          "dev": true
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         "vinyl": {
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-          "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-0.4.6.tgz",
-          "integrity": "sha1-LzVsh6VQolVGHza76ypbqL94SEc=",
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/vinyl/-/vinyl-2.2.0.tgz",
+          "integrity": "sha512-MBH+yP0kC/GQ5GwBqrTPTzEfiiLjta7hTtvQtbxBgTeSXsmKQRQecjibMbxIXzVT3Y9KJK+drOz1/k+vsu8Nkg==",
           "dev": true,
           "requires": {
-            "clone": "^0.2.0",
-            "clone-stats": "^0.0.1"
+            "clone": "^2.1.1",
+            "clone-buffer": "^1.0.0",
+            "clone-stats": "^1.0.0",
+            "cloneable-readable": "^1.0.0",
+            "remove-trailing-separator": "^1.0.1",
+            "replace-ext": "^1.0.0"
           }
         }
       }
@@ -4330,12 +6715,6 @@
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       }
     },
-    "whet.extend": {
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-      "resolved": "https://registry.npmjs.org/whet.extend/-/whet.extend-0.9.9.tgz",
-      "integrity": "sha1-+HfVv2SMl+WqVC+twW1qJZucEaE=",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -4345,6 +6724,12 @@
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+      "dev": true
+    },
     "window-size": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
@@ -4357,6 +6742,16 @@
       "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
       "dev": true
     },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      }
+    },
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -4369,6 +6764,12 @@
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       "dev": true
     },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
     "yargs": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
@@ -4380,6 +6781,23 @@
         "decamelize": "^1.0.0",
         "window-size": "0.1.0"
       }
+    },
+    "yargs-parser": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
+      "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
+      "dev": true,
+      "requires": {
+        "camelcase": "^3.0.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 07f8172..143636c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "leaflet-velocity",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "A custom layer for leaflet to visualise arbitrary velocities",
   "main": "dist/leaflet-velocity.js",
   "scripts": {
@@ -31,11 +31,12 @@
   "dependencies": {},
   "devDependencies": {
     "babel-preset-es2015": "^6.9.0",
-    "gulp": "^3.9.1",
+    "cssnano": "^4.1.10",
+    "gulp": "^4.0.2",
     "gulp-babel": "^6.1.2",
     "gulp-concat": "^2.6.0",
-    "gulp-concat-css": "^2.3.0",
-    "gulp-cssnano": "^2.1.2",
+    "gulp-concat-css": "^3.1.0",
+    "gulp-postcss": "^8.0.0",
     "gulp-rename": "^1.2.2",
     "gulp-uglify": "^1.5.4"
   }
diff --git a/postcss.config.js b/postcss.config.js
new file mode 100644
index 0000000..ed725fc
--- /dev/null
+++ b/postcss.config.js
@@ -0,0 +1,7 @@
+module.exports = {
+  plugins: [
+    require('cssnano')({
+      preset: 'default',
+    }),
+  ],
+};
\ No newline at end of file