diff --git a/package.json b/package.json
index 2366f42..b932cc1 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "gulp": "^3.9.0",
     "gulp-concat": "^2.6.0",
     "gulp-postcss": "^7.0.0",
-    "gulp-sass": "^3.1.0",
+    "gulp-sass": "^4.0.0",
     "merge-stream": "^1.0.0",
     "metaquery": "^1.2.5",
     "node-sass": "^4.5.3",
diff --git a/yarn.lock b/yarn.lock
index ecab3ad..fe2124b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -70,6 +70,12 @@ amdefine@>=0.0.4:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/amdefine/-/amdefine-1.0.1.tgz#4a5282ac164729e93619bcfd3ad151f817ce91f5"
 
+ansi-colors@^1.0.1:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/ansi-colors/-/ansi-colors-1.1.0.tgz#6374b4dd5d4718ff3ce27a671a3b1cad077132a9"
+  dependencies:
+    ansi-wrap "^0.1.0"
+
 ansi-cyan@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/ansi-cyan/-/ansi-cyan-0.1.1.tgz#538ae528af8982f28ae30d86f2f17456d2609873"
@@ -110,7 +116,7 @@ ansi-styles@^3.1.0, ansi-styles@^3.2.0:
   dependencies:
     color-convert "^1.9.0"
 
-ansi-wrap@0.1.0:
+ansi-wrap@0.1.0, ansi-wrap@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/ansi-wrap/-/ansi-wrap-0.1.0.tgz#a82250ddb0015e9a27ca82e82ea603bbfa45efaf"
 
@@ -1583,7 +1589,7 @@ extend-shallow@^2.0.1:
   dependencies:
     is-extendable "^0.1.0"
 
-extend-shallow@^3.0.0:
+extend-shallow@^3.0.0, extend-shallow@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/extend-shallow/-/extend-shallow-3.0.2.tgz#26a71aaf073b39fb2127172746131c2704028db8"
   dependencies:
@@ -2152,17 +2158,20 @@ gulp-postcss@^7.0.0:
     postcss-load-config "^1.2.0"
     vinyl-sourcemaps-apply "^0.2.1"
 
-gulp-sass@^3.1.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/gulp-sass/-/gulp-sass-3.1.0.tgz#53dc4b68a1f5ddfe4424ab4c247655269a8b74b7"
+gulp-sass@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/gulp-sass/-/gulp-sass-4.0.0.tgz#8b7f89298959fc2491b99a67939e25e9a0db0f3f"
   dependencies:
-    gulp-util "^3.0"
+    chalk "^2.3.0"
     lodash.clonedeep "^4.3.2"
-    node-sass "^4.2.0"
+    node-sass "^4.8.3"
+    plugin-error "^1.0.1"
+    replace-ext "^1.0.0"
+    strip-ansi "^4.0.0"
     through2 "^2.0.0"
     vinyl-sourcemaps-apply "^0.2.0"
 
-gulp-util@^3.0, gulp-util@^3.0.0:
+gulp-util@^3.0.0:
   version "3.0.8"
   resolved "https://registry.yarnpkg.com/gulp-util/-/gulp-util-3.0.8.tgz#0054e1e744502e27c04c187c3ecc505dd54bbb4f"
   dependencies:
@@ -3362,6 +3371,10 @@ mute-stream@0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
 
+nan@^2.10.0:
+  version "2.10.0"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
+
 nan@^2.3.0, nan@^2.3.2:
   version "2.8.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.8.0.tgz#ed715f3fe9de02b57a5e6252d90a96675e1f085a"
@@ -3459,7 +3472,7 @@ node-pre-gyp@^0.6.39:
     tar "^2.2.1"
     tar-pack "^3.4.0"
 
-node-sass@^4.2.0, node-sass@^4.5.3:
+node-sass@^4.5.3:
   version "4.7.2"
   resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.7.2.tgz#9366778ba1469eb01438a9e8592f4262bcb6794e"
   dependencies:
@@ -3483,6 +3496,30 @@ node-sass@^4.2.0, node-sass@^4.5.3:
     stdout-stream "^1.4.0"
     "true-case-path" "^1.0.2"
 
+node-sass@^4.8.3:
+  version "4.8.3"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.8.3.tgz#d077cc20a08ac06f661ca44fb6f19cd2ed41debb"
+  dependencies:
+    async-foreach "^0.1.3"
+    chalk "^1.1.1"
+    cross-spawn "^3.0.0"
+    gaze "^1.0.0"
+    get-stdin "^4.0.1"
+    glob "^7.0.3"
+    in-publish "^2.0.0"
+    lodash.assign "^4.2.0"
+    lodash.clonedeep "^4.3.2"
+    lodash.mergewith "^4.6.0"
+    meow "^3.7.0"
+    mkdirp "^0.5.1"
+    nan "^2.10.0"
+    node-gyp "^3.3.1"
+    npmlog "^4.0.0"
+    request "~2.79.0"
+    sass-graph "^2.2.4"
+    stdout-stream "^1.4.0"
+    "true-case-path" "^1.0.2"
+
 "nopt@2 || 3":
   version "3.0.6"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-3.0.6.tgz#c6465dbf08abcd4db359317f79ac68a646b28ff9"
@@ -3879,6 +3916,15 @@ plugin-error@^0.1.2:
     arr-union "^2.0.1"
     extend-shallow "^1.1.2"
 
+plugin-error@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/plugin-error/-/plugin-error-1.0.1.tgz#77016bd8919d0ac377fdcdd0322328953ca5781c"
+  dependencies:
+    ansi-colors "^1.0.1"
+    arr-diff "^4.0.0"
+    arr-union "^3.1.0"
+    extend-shallow "^3.0.2"
+
 pluralize@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/pluralize/-/pluralize-7.0.0.tgz#298b89df8b93b0221dbf421ad2b1b1ea23fc6777"