diff --git a/build.js b/build.js
index 885891b68b906..4f9a52b687991 100755
--- a/build.js
+++ b/build.js
@@ -21,7 +21,6 @@ const defaultsDeep = require('lodash.defaultsdeep')
 const autoprefixer = require('autoprefixer')
 const marked = require('marked')
 const postcss = require('postcss')
-const fibers = require('fibers')
 const sass = require('sass')
 const ncp = require('ncp')
 const junk = require('junk')
@@ -214,7 +213,6 @@ function buildCSS () {
 
   const sassOpts = {
     file: src,
-    fiber: fibers,
     outFile: dest,
     outputStyle: process.env.NODE_ENV !== 'development' ? 'compressed' : 'expanded'
   }
diff --git a/package-lock.json b/package-lock.json
index 5d60060daf82e..9a00c92abb502 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1827,11 +1827,6 @@
       "integrity": "sha512-IofjkYBZaZivn0V8nnsMJGBr4jVLxHDheKSW88PyxS5QC4Vo9ZbZVvhzlSxY87fVq3STR6r+4cGepyHkcWOQSw==",
       "optional": true
     },
-    "detect-libc": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-1.0.3.tgz",
-      "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups="
-    },
     "dir-glob": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
@@ -2725,14 +2720,6 @@
       "integrity": "sha512-iAHrIslQb3U68OcMSP0kkNWabp7sSN6d2TBSb2JO3gcLJVDd4owr/hKM4SFJovFOUeeXeItjYgouEDTMWiVAnA==",
       "dev": true
     },
-    "fibers": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/fibers/-/fibers-5.0.0.tgz",
-      "integrity": "sha512-UpGv/YAZp7mhKHxDvC1tColrroGRX90sSvh8RMZV9leo+e5+EkRVgCEZPlmXeo3BUNQTZxUaVdLskq1Q2FyCPg==",
-      "requires": {
-        "detect-libc": "^1.0.3"
-      }
-    },
     "figgy-pudding": {
       "version": "3.5.2",
       "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.2.tgz",
diff --git a/package.json b/package.json
index b67f0e3e5a9f4..e3deaa5679b19 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,6 @@
   "dependencies": {
     "autoprefixer": "^10.2.5",
     "cheerio": "^0.22.0",
-    "fibers": "^5.0.0",
     "graceful-fs": "^4.2.6",
     "handlebars": "^4.7.7",
     "jstransformer-handlebars": "^1.1.0",