diff --git a/packages/angular_devkit/build_angular/package.json b/packages/angular_devkit/build_angular/package.json
index c63ad20f38c9..64500ed3e7ca 100644
--- a/packages/angular_devkit/build_angular/package.json
+++ b/packages/angular_devkit/build_angular/package.json
@@ -28,7 +28,7 @@
     "circular-dependency-plugin": "5.2.2",
     "copy-webpack-plugin": "6.3.0",
     "core-js": "3.7.0",
-    "css-loader": "5.0.1",
+    "css-loader": "4.3.0",
     "cssnano": "4.1.10",
     "file-loader": "6.2.0",
     "find-cache-dir": "3.3.1",
diff --git a/yarn.lock b/yarn.lock
index 63b4c559864f..5660e161a5a9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3236,7 +3236,7 @@ camelcase@^4.1.0:
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
   integrity sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=
 
-camelcase@^6.2.0:
+camelcase@^6.0.0, camelcase@^6.2.0:
   version "6.2.0"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.2.0.tgz#924af881c9d525ac9d87f40d964e5cea982a1809"
   integrity sha512-c7wVvbw3f37nuobQNtgsgG9POC9qMbNuMQmTCqZv23b6MIz0fcYpBiOlv9gEN/hdLdnZTDQhg6e9Dq5M1vKvfg==
@@ -4055,6 +4055,24 @@ css-declaration-sorter@^4.0.1:
     postcss "^7.0.1"
     timsort "^0.3.0"
 
+css-loader@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/css-loader/-/css-loader-4.3.0.tgz#c888af64b2a5b2e85462c72c0f4a85c7e2e0821e"
+  integrity sha512-rdezjCjScIrsL8BSYszgT4s476IcNKt6yX69t0pHjJVnPUTDpn4WfIpDQTN3wCJvUvfsz/mFjuGOekf3PY3NUg==
+  dependencies:
+    camelcase "^6.0.0"
+    cssesc "^3.0.0"
+    icss-utils "^4.1.1"
+    loader-utils "^2.0.0"
+    postcss "^7.0.32"
+    postcss-modules-extract-imports "^2.0.0"
+    postcss-modules-local-by-default "^3.0.3"
+    postcss-modules-scope "^2.2.0"
+    postcss-modules-values "^3.0.0"
+    postcss-value-parser "^4.1.0"
+    schema-utils "^2.7.1"
+    semver "^7.3.2"
+
 css-loader@5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/css-loader/-/css-loader-5.0.1.tgz#9e4de0d6636a6266a585bd0900b422c85539d25f"
@@ -6223,6 +6241,13 @@ iconv-lite@^0.6.2:
   dependencies:
     safer-buffer ">= 2.1.2 < 3.0.0"
 
+icss-utils@^4.0.0, icss-utils@^4.1.1:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-4.1.1.tgz#21170b53789ee27447c2f47dd683081403f9a467"
+  integrity sha512-4aFq7wvWyMHKgxsH8QQtGpvbASCf+eM3wPRLI6R+MgAnTCZ6STYsRvttLvRWK0Nfif5piF394St3HeJDaljGPA==
+  dependencies:
+    postcss "^7.0.14"
+
 icss-utils@^5.0.0:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/icss-utils/-/icss-utils-5.0.0.tgz#03ed56c3accd32f9caaf1752ebf64ef12347bb84"
@@ -6509,7 +6534,7 @@ is-color-stop@^1.0.0:
     rgb-regex "^1.0.1"
     rgba-regex "^1.0.0"
 
-is-core-module@^2.0.0:
+is-core-module@^2.0.0, is-core-module@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/is-core-module/-/is-core-module-2.1.0.tgz#a4cc031d9b1aca63eecbd18a650e13cb4eeab946"
   integrity sha512-YcV7BgVMRFRua2FqQzKtTDMz8iCuLEyGKjr70q8Zm1yy2qKcurbFEd79PAdHV77oL3NrAaOVQIbMmiHQCHB7ZA==
@@ -9513,11 +9538,28 @@ postcss-minify-selectors@^4.0.2:
     postcss "^7.0.0"
     postcss-selector-parser "^3.0.0"
 
+postcss-modules-extract-imports@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-2.0.0.tgz#818719a1ae1da325f9832446b01136eeb493cd7e"
+  integrity sha512-LaYLDNS4SG8Q5WAWqIJgdHPJrDDr/Lv775rMBFUbgjTz6j34lUznACHcdRWroPvXANP2Vj7yNK57vp9eFqzLWQ==
+  dependencies:
+    postcss "^7.0.5"
+
 postcss-modules-extract-imports@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-3.0.0.tgz#cda1f047c0ae80c97dbe28c3e76a43b88025741d"
   integrity sha512-bdHleFnP3kZ4NYDhuGlVK+CMrQ/pqUm8bx/oGL93K6gVwiclvX5x0n76fYMKuIGKzlABOy13zsvqjb0f92TEXw==
 
+postcss-modules-local-by-default@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/postcss-modules-local-by-default/-/postcss-modules-local-by-default-3.0.3.tgz#bb14e0cc78279d504dbdcbfd7e0ca28993ffbbb0"
+  integrity sha512-e3xDq+LotiGesympRlKNgaJ0PCzoUIdpH0dj47iWAui/kyTgh3CiAr1qP54uodmJhl6p9rN6BoNcdEDVJx9RDw==
+  dependencies:
+    icss-utils "^4.1.1"
+    postcss "^7.0.32"
+    postcss-selector-parser "^6.0.2"
+    postcss-value-parser "^4.1.0"
+
 postcss-modules-local-by-default@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-local-by-default/-/postcss-modules-local-by-default-4.0.0.tgz#ebbb54fae1598eecfdf691a02b3ff3b390a5a51c"
@@ -9527,6 +9569,14 @@ postcss-modules-local-by-default@^4.0.0:
     postcss-selector-parser "^6.0.2"
     postcss-value-parser "^4.1.0"
 
+postcss-modules-scope@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/postcss-modules-scope/-/postcss-modules-scope-2.2.0.tgz#385cae013cc7743f5a7d7602d1073a89eaae62ee"
+  integrity sha512-YyEgsTMRpNd+HmyC7H/mh3y+MeFWevy7V1evVhJWewmMbjDHIbZbOXICC2y+m1xI1UVfIT1HMW/O04Hxyu9oXQ==
+  dependencies:
+    postcss "^7.0.6"
+    postcss-selector-parser "^6.0.0"
+
 postcss-modules-scope@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-scope/-/postcss-modules-scope-3.0.0.tgz#9ef3151456d3bbfa120ca44898dfca6f2fa01f06"
@@ -9534,6 +9584,14 @@ postcss-modules-scope@^3.0.0:
   dependencies:
     postcss-selector-parser "^6.0.4"
 
+postcss-modules-values@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-modules-values/-/postcss-modules-values-3.0.0.tgz#5b5000d6ebae29b4255301b4a3a54574423e7f10"
+  integrity sha512-1//E5jCBrZ9DmRX+zCtmQtRSV6PV42Ix7Bzj9GbwJceduuf7IqP8MgeTXuRDHOWj2m0VzZD5+roFWDuU8RQjcg==
+  dependencies:
+    icss-utils "^4.0.0"
+    postcss "^7.0.6"
+
 postcss-modules-values@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-values/-/postcss-modules-values-4.0.0.tgz#d7c5e7e68c3bb3c9b27cbf48ca0bb3ffb4602c9c"
@@ -9660,7 +9718,7 @@ postcss-selector-parser@^3.0.0:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-selector-parser@^6.0.2, postcss-selector-parser@^6.0.4:
+postcss-selector-parser@^6.0.0, postcss-selector-parser@^6.0.2, postcss-selector-parser@^6.0.4:
   version "6.0.4"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.4.tgz#56075a1380a04604c38b063ea7767a129af5c2b3"
   integrity sha512-gjMeXBempyInaBqpp8gODmwZ52WaYsVOsfr4L4lDQ7n3ncD6mEyySiDtgzCT+NYC0mmeOLvtsF8iaEf0YT6dBw==
@@ -9710,7 +9768,7 @@ postcss-value-parser@^4.0.2, postcss-value-parser@^4.1.0:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.1.0.tgz#443f6a20ced6481a2bda4fa8532a6e55d789a2cb"
   integrity sha512-97DXOFbQJhk71ne5/Mt6cOu6yxsSfM0QGQyl0L25Gca4yGWEGJaig7l7gbCX623VqTBNGLRLaVUCnNkcedlRSQ==
 
-"postcss@5 - 7", postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.2, postcss@^7.0.27, postcss@^7.0.29, postcss@^7.0.32:
+"postcss@5 - 7", postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.2, postcss@^7.0.27, postcss@^7.0.29, postcss@^7.0.32, postcss@^7.0.5, postcss@^7.0.6:
   version "7.0.35"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.35.tgz#d2be00b998f7f211d8a276974079f2e92b970e24"
   integrity sha512-3QT8bBJeX/S5zKTTjTCIjRF3If4avAT6kqxcASlTWEtAFCb9NH0OUxNDfgZSWdP5fJnBYCMEWkIFfWeugjzYMg==
@@ -10480,7 +10538,15 @@ resolve-url@^0.2.1:
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
   integrity sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=
 
-resolve@1.18.1, resolve@^1.1.5, resolve@^1.1.6, resolve@^1.1.7, resolve@^1.10.0, resolve@^1.17.0, resolve@^1.3.2, resolve@^1.8.1:
+resolve@1.19.0:
+  version "1.19.0"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.19.0.tgz#1af5bf630409734a067cae29318aac7fa29a267c"
+  integrity sha512-rArEXAgsBG4UgRGcynxWIWKFvh/XZCcS8UJdHhwy91zwAvCZIbcs+vAbflgBnNjYMs/i/i+/Ux6IZhML1yPvxg==
+  dependencies:
+    is-core-module "^2.1.0"
+    path-parse "^1.0.6"
+
+resolve@^1.1.5, resolve@^1.1.6, resolve@^1.1.7, resolve@^1.10.0, resolve@^1.17.0, resolve@^1.3.2, resolve@^1.8.1:
   version "1.18.1"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.18.1.tgz#018fcb2c5b207d2a6424aee361c5a266da8f4130"
   integrity sha512-lDfCPaMKfOJXjy0dPayzPdF1phampNWr3qFCjAu+rw/qbQmr5jWH5xN2hwh9QKfw9E5v4hwV7A+jrCmL8yjjqA==
@@ -10703,7 +10769,7 @@ schema-utils@^1.0.0:
     ajv-errors "^1.0.0"
     ajv-keywords "^3.1.0"
 
-schema-utils@^2.6.4, schema-utils@^2.6.5, schema-utils@^2.7.0:
+schema-utils@^2.6.4, schema-utils@^2.6.5, schema-utils@^2.7.0, schema-utils@^2.7.1:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-2.7.1.tgz#1ca4f32d1b24c590c203b8e7a50bf0ea4cd394d7"
   integrity sha512-SHiNtMOUGWBQJwzISiVYKu82GiV4QYGePp3odlY1tuKO7gPtphAT5R/py0fA6xtbgLL/RvtJZnU9b8s0F1q0Xg==