diff --git a/packages/gatsby-plugin-postcss/package.json b/packages/gatsby-plugin-postcss/package.json
index ff138c67bf2c9..b50098f1911de 100644
--- a/packages/gatsby-plugin-postcss/package.json
+++ b/packages/gatsby-plugin-postcss/package.json
@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "postcss-loader": "^4.0.4"
+    "postcss-loader": "^4.1.0"
   },
   "devDependencies": {
     "@babel/cli": "^7.12.1",
diff --git a/yarn.lock b/yarn.lock
index ab427109c4266..e412fdb83e1e9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -14117,14 +14117,7 @@ is-redirect@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-redirect/-/is-redirect-1.0.0.tgz#1d03dded53bd8db0f30c26e4f95d36fc7c87dc24"
 
-is-reference@^1.1.2:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/is-reference/-/is-reference-1.1.3.tgz#e99059204b66fdbe09305cfca715a29caa5c8a51"
-  integrity sha512-W1iHHv/oyBb2pPxkBxtaewxa1BC58Pn5J0hogyCdefwUIvb6R+TGbAcIa4qPNYLqLhb3EnOgUf2MQkkF76BcKw==
-  dependencies:
-    "@types/estree" "0.0.39"
-
-is-reference@^1.2.1:
+is-reference@^1.1.2, is-reference@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/is-reference/-/is-reference-1.2.1.tgz#8b2dac0b371f4bc994fdeaba9eb542d03002d0b7"
   integrity sha512-U82MsXXiFIrjCK4otLT+o2NA2Cd2g5MLoOVXUZjIOhLurrRxpEXzI8O0KZHr3IjLvlAH1kTPYSuqer5T9ZVBKQ==
@@ -19256,10 +19249,10 @@ postcss-loader@^3.0.0:
     postcss-load-config "^2.0.0"
     schema-utils "^1.0.0"
 
-postcss-loader@^4.0.4:
-  version "4.0.4"
-  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-4.0.4.tgz#b2d005b52e008a44991cf8123bee207e635eb53e"
-  integrity sha512-pntA9zIR14drQo84yGTjQJg1m7T0DkXR4vXYHBngiRZdJtEeCrojL6lOpqUanMzG375lIJbT4Yug85zC/AJWGw==
+postcss-loader@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-4.1.0.tgz#4647a6c8dad3cb6b253fbfaa21d62201086f6e39"
+  integrity sha512-vbCkP70F3Q9PIk6d47aBwjqAMI4LfkXCoyxj+7NPNuVIwfTGdzv2KVQes59/RuxMniIgsYQCFSY42P3+ykJfaw==
   dependencies:
     cosmiconfig "^7.0.0"
     klona "^2.0.4"
@@ -22360,14 +22353,7 @@ rollup@^1, rollup@^1.32.1:
     "@types/node" "*"
     acorn "^7.1.0"
 
-rollup@^2.0.0:
-  version "2.23.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.23.0.tgz#b7ab1fee0c0e60132fd0553c4df1e9cdacfada9d"
-  integrity sha512-vLNmZFUGVwrnqNAJ/BvuLk1MtWzu4IuoqsH9UWK5AIdO3rt8/CSiJNvPvCIvfzrbNsqKbNzPAG1V2O4eTe2XZg==
-  optionalDependencies:
-    fsevents "~2.1.2"
-
-rollup@^2.34.2, "rollup@^2.34.2 ":
+rollup@^2.0.0, rollup@^2.34.2, "rollup@^2.34.2 ":
   version "2.34.2"
   resolved "https://registry.yarnpkg.com/rollup/-/rollup-2.34.2.tgz#fa73e05c64df587e9ed4dc80d7d4e7d4a43f8908"
   integrity sha512-mvtQLqu3cNeoctS+kZ09iOPxrc1P1/Bt1z15enuQ5feyKOdM3MJAVFjjsygurDpSWn530xB4AlA83TWIzRstXA==