diff --git a/package.json b/package.json
index a31321e..6fab77c 100644
--- a/package.json
+++ b/package.json
@@ -98,7 +98,7 @@
     "jsdoc-x": "^4",
     "jsdom": "^24",
     "less": "^4",
-    "less-plugin-clean-css": "^1",
+    "less-plugin-clean-css": "^1.6.0",
     "lodash": "^4",
     "marked": "^7",
     "npm-name": "^8",
diff --git a/yarn.lock b/yarn.lock
index 8c0a984..1e40c0c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1131,7 +1131,7 @@ cjs-module-lexer@^1.0.0:
   resolved "https://registry.yarnpkg.com/cjs-module-lexer/-/cjs-module-lexer-1.3.1.tgz#c485341ae8fd999ca4ee5af2d7a1c9ae01e0099c"
   integrity sha512-a3KdPAANPbNE4ZUv9h6LckSl9zLsYOP4MBmhIPkRaeyybt+r4UghLvq+xw/YwUcC1gqylCkL4rdVs3Lwupjm4Q==
 
-clean-css@>=4.1.11, clean-css@^3.0.1:
+clean-css@5.3.3, clean-css@>=4.1.11:
   version "5.3.3"
   resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-5.3.3.tgz#b330653cd3bd6b75009cc25c714cae7b93351ccd"
   integrity sha512-D5J+kHaVb/wKSFcyyV75uCn8fiY4sV38XJoe4CUyGQ+mOU/fMVYUdH1hJC+CJQ5uY3EnW27SbJYS4X8BiLrAFg==
@@ -2774,12 +2774,12 @@ ky@^1.2.0:
   resolved "https://registry.yarnpkg.com/ky/-/ky-1.2.4.tgz#d095aa848c686116f3326bfce53d9c2ffdb692c1"
   integrity sha512-CfSrf4a0yj1n6WgPT6kQNQOopIGLkQzqSAXo05oKByaH7G3SiqW4a8jGox0p9whMXqO49H7ljgigivrMyycAVA==
 
-less-plugin-clean-css@^1:
-  version "1.5.1"
-  resolved "https://registry.yarnpkg.com/less-plugin-clean-css/-/less-plugin-clean-css-1.5.1.tgz#cc57af7aa3398957e56decebe63cb60c23429703"
-  integrity sha512-Pc68AFHAEJO3aAoRvnUTW5iAiAv6y+TQsWLTTwVNqjiDno6xCvxz1AtfQl7Y0MZSpHPalFajM1EU4RB5UVINpw==
+less-plugin-clean-css@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/less-plugin-clean-css/-/less-plugin-clean-css-1.6.0.tgz#befc051436759c1bb1f13d026e39f735f7ba0185"
+  integrity sha512-jwXX6WlXT57OVCXa5oBJBaJq1b4s1BOKeEEoAL2UTeEitogQWfTcBbLT/vow9pl0N0MXV8Mb4KyhTGG0YbEKyQ==
   dependencies:
-    clean-css "^3.0.1"
+    clean-css "5.3.3"
 
 less@^4:
   version "4.2.0"