diff --git a/Dockerfile b/Dockerfile
index 7d27d5a89..27816d1cc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@ RUN DEBIAN_FRONTEND='noninteractive' apt-get update && \
   apt-get -y --force-yes install apt-utils python-pip \
   python-dev build-essential git software-properties-common \
   python-software-properties libpq-dev g++ make libpcre3 libpcre3-dev libffi-dev \
-  nodejs npm ruby-bundler tzdata
+  nodejs npm tzdata
 
 # Set timezone
 RUN echo "Europe/London" > /etc/timezone  &&  dpkg-reconfigure -f noninteractive tzdata
@@ -60,9 +60,6 @@ WORKDIR /home/app/flask
 # PIP INSTALL APPLICATION
 RUN pip install -r requirements.txt && find . -name '*.pyc' -delete && pybabel compile -d cla_public/translations
 
-#install ruby-sass for gulp minify-css
-RUN bundle install
-
 RUN npm install -g n   # Install n globally
 RUN n 8.9.3       # Install and use v8.9.3
 
diff --git a/Gemfile b/Gemfile
deleted file mode 100644
index cd53975e6..000000000
--- a/Gemfile
+++ /dev/null
@@ -1,5 +0,0 @@
-source 'https://rubygems.org'
-
-# ruby '2.1.5'
-
-gem 'sass', '3.4.9'
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index 7839e5074..000000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,10 +0,0 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    sass (3.4.9)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  sass (= 3.4.9)
diff --git a/package-lock.json b/package-lock.json
index dcd1c301c..ce69b24c2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -75,6 +75,21 @@
         "json-stable-stringify": "1.0.1"
       }
     },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
+    "ansi-colors": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
+      "integrity": "sha512-SFKX67auSNoVR38N3L+nvsPjOE0bybKTYbkf5tRvushrAPQ9V75huw0ZxBkKVeRU9kqH3d6HA4xTckbwZ4ixmA==",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-cyan": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/ansi-cyan/-/ansi-cyan-0.1.1.tgz",
@@ -130,6 +145,12 @@
         "normalize-path": "2.1.1"
       }
     },
+    "aproba": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
+      "dev": true
+    },
     "archive-type": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/archive-type/-/archive-type-3.2.0.tgz",
@@ -153,6 +174,16 @@
       "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
       "dev": true
     },
+    "are-we-there-yet": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
+      "dev": true,
+      "requires": {
+        "delegates": "1.0.0",
+        "readable-stream": "2.3.3"
+      }
+    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
@@ -289,6 +320,12 @@
       "integrity": "sha1-dhfBkXQB/Yykooqtzj266Yr+tDI=",
       "dev": true
     },
+    "async-foreach": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/async-foreach/-/async-foreach-0.1.3.tgz",
+      "integrity": "sha1-NhIfhFwFeBct5Bmpfb6x0W7DRUI=",
+      "dev": true
+    },
     "async-limiter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
@@ -517,6 +554,15 @@
       "integrity": "sha1-vPEwUspURj8w+fx+lbmkdjCpSSE=",
       "dev": true
     },
+    "block-stream": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
+      "dev": true,
+      "requires": {
+        "inherits": "2.0.3"
+      }
+    },
     "boolbase": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/boolbase/-/boolbase-1.0.0.tgz",
@@ -1180,6 +1226,12 @@
         "date-now": "0.1.4"
       }
     },
+    "console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
+      "dev": true
+    },
     "console-stream": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/console-stream/-/console-stream-0.1.1.tgz",
@@ -1337,12 +1389,6 @@
         "array-find-index": "1.0.2"
       }
     },
-    "dargs": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/dargs/-/dargs-2.1.0.tgz",
-      "integrity": "sha1-RsJ/+rH/sTeO8hJZchNxn+YCvJM=",
-      "dev": true
-    },
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -1913,6 +1959,12 @@
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
       "dev": true
     },
+    "delegates": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
+      "dev": true
+    },
     "depd": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.1.tgz",
@@ -2643,6 +2695,18 @@
         "time-stamp": "1.1.0"
       }
     },
+    "fast-deep-equal": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-1.1.0.tgz",
+      "integrity": "sha1-wFNHeBfIa1HaqFPIHgWbcz0CNhQ=",
+      "dev": true
+    },
+    "fast-json-stable-stringify": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.0.0.tgz",
+      "integrity": "sha1-1RQsDK7msRifh9OnYREGT4bIu/I=",
+      "dev": true
+    },
     "fast-levenshtein": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
@@ -4075,6 +4139,18 @@
         }
       }
     },
+    "fstream": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
+      "integrity": "sha1-XB+x8RdHcRTwYyoOtLcbPLD9MXE=",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "4.1.11",
+        "inherits": "2.0.3",
+        "mkdirp": "0.5.1",
+        "rimraf": "2.6.2"
+      }
+    },
     "ftp": {
       "version": "0.3.10",
       "resolved": "https://registry.npmjs.org/ftp/-/ftp-0.3.10.tgz",
@@ -4117,6 +4193,22 @@
       "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
       "dev": true
     },
+    "gauge": {
+      "version": "2.7.4",
+      "resolved": "https://registry.npmjs.org/gauge/-/gauge-2.7.4.tgz",
+      "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
+      "dev": true,
+      "requires": {
+        "aproba": "1.2.0",
+        "console-control-strings": "1.1.0",
+        "has-unicode": "2.0.1",
+        "object-assign": "4.1.1",
+        "signal-exit": "3.0.2",
+        "string-width": "1.0.2",
+        "strip-ansi": "3.0.1",
+        "wide-align": "1.1.3"
+      }
+    },
     "gaze": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/gaze/-/gaze-0.5.2.tgz",
@@ -4731,25 +4823,115 @@
       "integrity": "sha1-OtRCh2PwXidk3sHGfYaNsnVoeBc=",
       "dev": true
     },
-    "gulp-ruby-sass": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/gulp-ruby-sass/-/gulp-ruby-sass-2.1.1.tgz",
-      "integrity": "sha1-6A9lCSEI7kr8tJNgiNxyUzaa3Kw=",
+    "gulp-sass": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/gulp-sass/-/gulp-sass-4.0.1.tgz",
+      "integrity": "sha512-OMQEgWNggpog8Tc5v1MuI6eo+5iiPkVeLL76iBhDoEEScLUPfZlpvzmgTnLkpcqdrNodZxpz5qcv6mS2rulk3g==",
       "dev": true,
       "requires": {
-        "convert-source-map": "1.5.1",
-        "cross-spawn": "5.1.0",
-        "dargs": "2.1.0",
-        "each-async": "1.1.1",
-        "escape-string-regexp": "1.0.5",
-        "glob": "7.1.2",
-        "glob2base": "0.0.12",
-        "gulp-util": "3.0.8",
-        "md5-hex": "1.3.0",
-        "object-assign": "4.1.1",
-        "os-tmpdir": "1.0.2",
-        "path-exists": "2.1.0",
-        "rimraf": "2.6.2"
+        "chalk": "2.4.1",
+        "lodash.clonedeep": "4.5.0",
+        "node-sass": "4.9.2",
+        "plugin-error": "1.0.1",
+        "replace-ext": "1.0.0",
+        "strip-ansi": "4.0.0",
+        "through2": "2.0.3",
+        "vinyl-sourcemaps-apply": "0.2.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "1.9.1"
+          }
+        },
+        "arr-diff": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+          "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "2.4.1",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.1.tgz",
+          "integrity": "sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "3.2.1",
+            "escape-string-regexp": "1.0.5",
+            "supports-color": "5.4.0"
+          }
+        },
+        "extend-shallow": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
+          "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+          "dev": true,
+          "requires": {
+            "assign-symbols": "1.0.0",
+            "is-extendable": "1.0.1"
+          }
+        },
+        "has-flag": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "is-extendable": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
+          "dev": true,
+          "requires": {
+            "is-plain-object": "2.0.4"
+          }
+        },
+        "plugin-error": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-1.0.1.tgz",
+          "integrity": "sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA==",
+          "dev": true,
+          "requires": {
+            "ansi-colors": "1.1.0",
+            "arr-diff": "4.0.0",
+            "arr-union": "3.1.0",
+            "extend-shallow": "3.0.2"
+          }
+        },
+        "replace-ext": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+          "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
+          "dev": true
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "3.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "5.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
+          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "dev": true,
+          "requires": {
+            "has-flag": "3.0.0"
+          }
+        }
       }
     },
     "gulp-sourcemaps": {
@@ -4927,6 +5109,12 @@
         "has-symbol-support-x": "1.4.1"
       }
     },
+    "has-unicode": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/has-unicode/-/has-unicode-2.0.1.tgz",
+      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
+      "dev": true
+    },
     "has-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-value/-/has-value-1.0.0.tgz",
@@ -5208,6 +5396,12 @@
       "integrity": "sha1-IAgH8Rqw9ycQ6khVQt4IgHX2jNI=",
       "dev": true
     },
+    "in-publish": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/in-publish/-/in-publish-2.0.0.tgz",
+      "integrity": "sha1-4g/146KvwmkDILbcVSaCqcf631E=",
+      "dev": true
+    },
     "indent-string": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/indent-string/-/indent-string-2.1.0.tgz",
@@ -5828,6 +6022,12 @@
         "logalot": "2.1.0"
       }
     },
+    "js-base64": {
+      "version": "2.4.8",
+      "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.4.8.tgz",
+      "integrity": "sha512-hm2nYpDrwoO/OzBhdcqs/XGT6XjSuSSCVEpia+Kl2J6x4CYt5hISlVL/AYU1khoDXv0AQVgxtdJySb9gjAn56Q==",
+      "dev": true
+    },
     "js-yaml": {
       "version": "3.10.0",
       "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.10.0.tgz",
@@ -5920,6 +6120,12 @@
       "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM=",
       "dev": true
     },
+    "json-schema-traverse": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz",
+      "integrity": "sha1-NJptRMU6Ud6JtAgFxdXlm0F9M0A=",
+      "dev": true
+    },
     "json-stable-stringify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
@@ -6797,21 +7003,6 @@
       "dev": true,
       "optional": true
     },
-    "md5-hex": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/md5-hex/-/md5-hex-1.3.0.tgz",
-      "integrity": "sha1-0sSv6YPENwZiF5uMrRRSGRNQRsQ=",
-      "dev": true,
-      "requires": {
-        "md5-o-matic": "0.1.1"
-      }
-    },
-    "md5-o-matic": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/md5-o-matic/-/md5-o-matic-0.1.1.tgz",
-      "integrity": "sha1-givM1l4RfFFPqxdrJZRdVBAKA8M=",
-      "dev": true
-    },
     "mdn-data": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-1.0.0.tgz",
@@ -7208,6 +7399,228 @@
         }
       }
     },
+    "node-gyp": {
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/node-gyp/-/node-gyp-3.7.0.tgz",
+      "integrity": "sha512-qDQE/Ft9xXP6zphwx4sD0t+VhwV7yFaloMpfbL2QnnDZcyaiakWlLdtFGGQfTAwpFHdpbRhRxVhIHN1OKAjgbg==",
+      "dev": true,
+      "requires": {
+        "fstream": "1.0.11",
+        "glob": "7.1.2",
+        "graceful-fs": "4.1.11",
+        "mkdirp": "0.5.1",
+        "nopt": "3.0.6",
+        "npmlog": "4.1.2",
+        "osenv": "0.1.4",
+        "request": "2.81.0",
+        "rimraf": "2.6.2",
+        "semver": "5.3.0",
+        "tar": "2.2.1",
+        "which": "1.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.3.0.tgz",
+          "integrity": "sha1-myzl094C0XxgEq0yaqa00M9U+U8=",
+          "dev": true
+        }
+      }
+    },
+    "node-sass": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/node-sass/-/node-sass-4.9.2.tgz",
+      "integrity": "sha512-LdxoJLZutx0aQXHtWIYwJKMj+9pTjneTcLWJgzf2XbGu0q5pRNqW5QvFCEdm3mc5rJOdru/mzln5d0EZLacf6g==",
+      "dev": true,
+      "requires": {
+        "async-foreach": "0.1.3",
+        "chalk": "1.1.3",
+        "cross-spawn": "3.0.1",
+        "gaze": "1.1.3",
+        "get-stdin": "4.0.1",
+        "glob": "7.1.2",
+        "in-publish": "2.0.0",
+        "lodash.assign": "4.2.0",
+        "lodash.clonedeep": "4.5.0",
+        "lodash.mergewith": "4.6.0",
+        "meow": "3.7.0",
+        "mkdirp": "0.5.1",
+        "nan": "2.10.0",
+        "node-gyp": "3.7.0",
+        "npmlog": "4.1.2",
+        "request": "2.87.0",
+        "sass-graph": "2.2.4",
+        "stdout-stream": "1.4.0",
+        "true-case-path": "1.0.2"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "5.5.2",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+          "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+          "dev": true,
+          "requires": {
+            "co": "4.6.0",
+            "fast-deep-equal": "1.1.0",
+            "fast-json-stable-stringify": "2.0.0",
+            "json-schema-traverse": "0.3.1"
+          }
+        },
+        "assert-plus": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+          "dev": true
+        },
+        "aws-sign2": {
+          "version": "0.7.0",
+          "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+          "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+          "dev": true
+        },
+        "cross-spawn": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-3.0.1.tgz",
+          "integrity": "sha1-ElYDfsufDF9549bvE14wdwGEuYI=",
+          "dev": true,
+          "requires": {
+            "lru-cache": "4.1.3",
+            "which": "1.3.0"
+          }
+        },
+        "form-data": {
+          "version": "2.3.2",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.2.tgz",
+          "integrity": "sha1-SXBJi+YEwgwAXU9cI67NIda0kJk=",
+          "dev": true,
+          "requires": {
+            "asynckit": "0.4.0",
+            "combined-stream": "1.0.6",
+            "mime-types": "2.1.17"
+          },
+          "dependencies": {
+            "combined-stream": {
+              "version": "1.0.6",
+              "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+              "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+              "dev": true,
+              "requires": {
+                "delayed-stream": "1.0.0"
+              }
+            }
+          }
+        },
+        "gaze": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/gaze/-/gaze-1.1.3.tgz",
+          "integrity": "sha512-BRdNm8hbWzFzWHERTrejLqwHDfS4GibPoq5wjTPIoJHoBtKGPg3xAFfxmM+9ztbXelxcf2hwQcaz1PtmFeue8g==",
+          "dev": true,
+          "requires": {
+            "globule": "1.2.1"
+          }
+        },
+        "globule": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/globule/-/globule-1.2.1.tgz",
+          "integrity": "sha512-g7QtgWF4uYSL5/dn71WxubOrS7JVGCnFPEnoeChJmBnyR9Mw8nGoEwOgJL/RC2Te0WhbsEUCejfH8SZNJ+adYQ==",
+          "dev": true,
+          "requires": {
+            "glob": "7.1.2",
+            "lodash": "4.17.10",
+            "minimatch": "3.0.4"
+          }
+        },
+        "har-schema": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
+          "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
+          "dev": true
+        },
+        "har-validator": {
+          "version": "5.0.3",
+          "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.0.3.tgz",
+          "integrity": "sha1-ukAsJmGU8VlW7xXg/PJCmT9qff0=",
+          "dev": true,
+          "requires": {
+            "ajv": "5.5.2",
+            "har-schema": "2.0.0"
+          }
+        },
+        "http-signature": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
+          "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
+          "dev": true,
+          "requires": {
+            "assert-plus": "1.0.0",
+            "jsprim": "1.4.1",
+            "sshpk": "1.13.1"
+          }
+        },
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        },
+        "lru-cache": {
+          "version": "4.1.3",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.3.tgz",
+          "integrity": "sha512-fFEhvcgzuIoJVUF8fYr5KR0YqxD238zgObTps31YdADwPPAp82a4M8TrckkWyx7ekNlf9aBcVn81cFwwXngrJA==",
+          "dev": true,
+          "requires": {
+            "pseudomap": "1.0.2",
+            "yallist": "2.1.2"
+          }
+        },
+        "nan": {
+          "version": "2.10.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.10.0.tgz",
+          "integrity": "sha512-bAdJv7fBLhWC+/Bls0Oza+mvTaNQtP+1RyhhhvD95pgUJz6XM5IzgmxOkItJ9tkoCiplvAnXI1tNmmUD/eScyA==",
+          "dev": true
+        },
+        "performance-now": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+          "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
+          "dev": true
+        },
+        "qs": {
+          "version": "6.5.2",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
+          "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
+          "dev": true
+        },
+        "request": {
+          "version": "2.87.0",
+          "resolved": "https://registry.npmjs.org/request/-/request-2.87.0.tgz",
+          "integrity": "sha512-fcogkm7Az5bsS6Sl0sibkbhcKsnyon/jV1kF3ajGmF0c8HrttdKTPRT9hieOaQHA5HEq6r8OyWOo/o781C1tNw==",
+          "dev": true,
+          "requires": {
+            "aws-sign2": "0.7.0",
+            "aws4": "1.6.0",
+            "caseless": "0.12.0",
+            "combined-stream": "1.0.5",
+            "extend": "3.0.1",
+            "forever-agent": "0.6.1",
+            "form-data": "2.3.2",
+            "har-validator": "5.0.3",
+            "http-signature": "1.2.0",
+            "is-typedarray": "1.0.0",
+            "isstream": "0.1.2",
+            "json-stringify-safe": "5.0.1",
+            "mime-types": "2.1.17",
+            "oauth-sign": "0.8.2",
+            "performance-now": "2.1.0",
+            "qs": "6.5.2",
+            "safe-buffer": "5.1.1",
+            "tough-cookie": "2.3.3",
+            "tunnel-agent": "0.6.0",
+            "uuid": "3.1.0"
+          }
+        }
+      }
+    },
     "node-status-codes": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/node-status-codes/-/node-status-codes-1.0.0.tgz",
@@ -7298,6 +7711,18 @@
         }
       }
     },
+    "npmlog": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-4.1.2.tgz",
+      "integrity": "sha512-2uUqazuKlTaSI/dC8AzicUck7+IrEaOnN/e0jd3Xtt1KcGpwx30v50mL7oPyr/h9bL3E4aZccVwpwP+5W9Vjkg==",
+      "dev": true,
+      "requires": {
+        "are-we-there-yet": "1.1.5",
+        "console-control-strings": "1.1.0",
+        "gauge": "2.7.4",
+        "set-blocking": "2.0.0"
+      }
+    },
     "nsdeclare": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/nsdeclare/-/nsdeclare-0.1.0.tgz",
@@ -8810,6 +9235,56 @@
       "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
       "dev": true
     },
+    "sass-graph": {
+      "version": "2.2.4",
+      "resolved": "https://registry.npmjs.org/sass-graph/-/sass-graph-2.2.4.tgz",
+      "integrity": "sha1-E/vWPNHK8JCLn9k0dq1DpR0eC0k=",
+      "dev": true,
+      "requires": {
+        "glob": "7.1.2",
+        "lodash": "4.17.4",
+        "scss-tokenizer": "0.2.3",
+        "yargs": "7.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "7.1.0",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-7.1.0.tgz",
+          "integrity": "sha1-a6MY6xaWFyf10oT46gA+jWFU0Mg=",
+          "dev": true,
+          "requires": {
+            "camelcase": "3.0.0",
+            "cliui": "3.2.0",
+            "decamelize": "1.2.0",
+            "get-caller-file": "1.0.2",
+            "os-locale": "1.4.0",
+            "read-pkg-up": "1.0.1",
+            "require-directory": "2.1.1",
+            "require-main-filename": "1.0.1",
+            "set-blocking": "2.0.0",
+            "string-width": "1.0.2",
+            "which-module": "1.0.0",
+            "y18n": "3.2.1",
+            "yargs-parser": "5.0.0"
+          }
+        },
+        "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"
+          }
+        }
+      }
+    },
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
@@ -8817,6 +9292,27 @@
       "dev": true,
       "optional": true
     },
+    "scss-tokenizer": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/scss-tokenizer/-/scss-tokenizer-0.2.3.tgz",
+      "integrity": "sha1-jrBtualyMzOCTT9VMGQRSYR85dE=",
+      "dev": true,
+      "requires": {
+        "js-base64": "2.4.8",
+        "source-map": "0.4.4"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.4.4",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
+          "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
+          "dev": true,
+          "requires": {
+            "amdefine": "1.0.1"
+          }
+        }
+      }
+    },
     "seek-bzip": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/seek-bzip/-/seek-bzip-1.0.5.tgz",
@@ -9535,6 +10031,15 @@
       "integrity": "sha1-+vUbnrdKrvOzrPStX2Gr8ky3uT4=",
       "dev": true
     },
+    "stdout-stream": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/stdout-stream/-/stdout-stream-1.4.0.tgz",
+      "integrity": "sha1-osfIWH5U2UJ+qe2zrD8s1SLfN4s=",
+      "dev": true,
+      "requires": {
+        "readable-stream": "2.3.3"
+      }
+    },
     "stream-combiner2": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/stream-combiner2/-/stream-combiner2-1.1.1.tgz",
@@ -9755,6 +10260,17 @@
       "integrity": "sha1-rifbOPZgp64uHDt9G8KQgZuFGeY=",
       "dev": true
     },
+    "tar": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz",
+      "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=",
+      "dev": true,
+      "requires": {
+        "block-stream": "0.0.9",
+        "fstream": "1.0.11",
+        "inherits": "2.0.3"
+      }
+    },
     "tar-stream": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.5.5.tgz",
@@ -10126,6 +10642,30 @@
         "trim-right-x": "3.0.0"
       }
     },
+    "true-case-path": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/true-case-path/-/true-case-path-1.0.2.tgz",
+      "integrity": "sha1-fskRMJJHZsf1c74wIMNPj9/QDWI=",
+      "dev": true,
+      "requires": {
+        "glob": "6.0.4"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "6.0.4",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-6.0.4.tgz",
+          "integrity": "sha1-DwiGD2oVUSey+t1PnOJLGqtuTSI=",
+          "dev": true,
+          "requires": {
+            "inflight": "1.0.6",
+            "inherits": "2.0.3",
+            "minimatch": "3.0.4",
+            "once": "1.4.0",
+            "path-is-absolute": "1.0.1"
+          }
+        }
+      }
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -10694,6 +11234,15 @@
       "integrity": "sha512-nMPVXGMdi/jQepXKryxqzEh/vCwdOYY/u6NZy40glMHvZfEr7/+vQKnDhEq4rZ1nniOFq9GWohQYB30uW/5Olg==",
       "dev": true
     },
+    "wide-align": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
+      "integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
+      "dev": true,
+      "requires": {
+        "string-width": "1.0.2"
+      }
+    },
     "window-size": {
       "version": "0.1.4",
       "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
diff --git a/package.json b/package.json
index 98cddc890..29a00b87e 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "gulp-jshint": "~2.1.0",
     "gulp-print": "^2.0.1",
     "gulp-rename": "~1.2.0",
-    "gulp-ruby-sass": "~2.1.1",
+    "gulp-sass": "^4.0.1",
     "gulp-uglify": "^3.0.0",
     "jshint": "^2.9.5",
     "jshint-stylish": "~2.2.1",
@@ -38,5 +38,6 @@
     "require-dir": "^0.3.2",
     "selenium-standalone": "~6.12.0",
     "yargs": "^10.0.3"
-  }
+  },
+  "dependencies": {}
 }
diff --git a/tasks/sass.js b/tasks/sass.js
index f6488aaaa..eb2667dae 100644
--- a/tasks/sass.js
+++ b/tasks/sass.js
@@ -1,21 +1,22 @@
-'use strict';
+"use strict";
 
-var paths = require('./_paths');
-var gulp = require('gulp');
-var filter = require('gulp-filter');
-var sass = require('gulp-ruby-sass');
-var browserSync = require('browser-sync');
+var paths = require("./_paths");
+var gulp = require("gulp");
+var filter = require("gulp-filter");
+var sass = require("gulp-sass");
+var browserSync = require("browser-sync");
 var reload = browserSync.reload;
 
-gulp.task('sass', ['clean-css'], function() {
-  return sass(paths.src + 'stylesheets/**/*.scss', { 
-      sourcemap: true,
-      lineNumbers: true,
-      style: 'compact',
-      loadPath: 'node_modules/govuk_frontend_toolkit/' // add node module toolkit path
-    })
-    .on('error', sass.logError )
-    .pipe(gulp.dest(paths.dest + 'stylesheets/'))
-    .pipe(filter('**/*.css'))  // don't react to .map files when reloading browser
-    .pipe(reload({ stream:true }));
+gulp.task("sass", ["clean-css"], function() {
+  return gulp
+    .src(paths.src + "stylesheets/**/*.scss")
+    .pipe(
+      sass({
+        includePaths: "node_modules/govuk_frontend_toolkit/",
+        outputStyle: "compact"
+      }).on("error", sass.logError)
+    )
+    .pipe(gulp.dest(paths.dest + "stylesheets/"))
+    .pipe(filter("**/*.css"))
+    .pipe(reload({ stream: true }));
 });