diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 6434693a3d..d8e7fdb2a2 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -61,7 +61,7 @@
     "boxen": "^5.0.1",
     "chalk": "^4.1.1",
     "chokidar": "^3.5.1",
-    "clean-css": "^5.1.2",
+    "clean-css": "^5.1.5",
     "commander": "^5.1.0",
     "copy-webpack-plugin": "^9.0.0",
     "core-js": "^3.9.1",
diff --git a/packages/docusaurus/src/webpack/utils.ts b/packages/docusaurus/src/webpack/utils.ts
index b4566b9e2c..64123417e6 100644
--- a/packages/docusaurus/src/webpack/utils.ts
+++ b/packages/docusaurus/src/webpack/utils.ts
@@ -561,6 +561,7 @@ export function getMinimizer(
             level: {
               1: {
                 all: false,
+                removeWhitespace: true,
               },
               2: {
                 all: true,
diff --git a/yarn.lock b/yarn.lock
index 6802436ebd..5e50992f83 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6448,10 +6448,10 @@ clean-css@^4.2.3:
   dependencies:
     source-map "~0.6.0"
 
-clean-css@^5.1.2:
-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-5.1.2.tgz#6ea0da7286b4ddc2469a1b776e2461a5007eed54"
-  integrity sha512-QcaGg9OuMo+0Ds933yLOY+gHPWbxhxqF0HDexmToPf8pczvmvZGYzd+QqWp9/mkucAOKViI+dSFOqoZIvXbeBw==
+clean-css@^5.1.5:
+  version "5.1.5"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-5.1.5.tgz#3b0af240dcfc9a3779a08c2332df3ebd4474f232"
+  integrity sha512-9dr/cU/LjMpU57PXlSvDkVRh0rPxJBXiBtD0+SgYt8ahTCsXtfKjCkNYgIoTC6mBg8CFr5EKhW3DKCaGMUbUfQ==
   dependencies:
     source-map "~0.6.0"