diff --git a/packages/vuepress/vuepress-theme-titanium/package.json b/packages/vuepress/vuepress-theme-titanium/package.json
index 4243283f..321d0c5a 100644
--- a/packages/vuepress/vuepress-theme-titanium/package.json
+++ b/packages/vuepress/vuepress-theme-titanium/package.json
@@ -18,7 +18,7 @@
     "@vuepress/plugin-search": "^1.7.1",
     "docsearch.js": "^2.6.3",
     "lodash": "^4.17.15",
-    "stylus": "^0.54.5",
+    "stylus": "^0.55.0",
     "stylus-loader": "^3.0.2",
     "vuepress-plugin-container": "^2.1.5"
   }
diff --git a/yarn.lock b/yarn.lock
index fe1230ed..149bc874 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4026,6 +4026,15 @@ css@^2.0.0:
     source-map-resolve "^0.5.2"
     urix "^0.1.0"
 
+css@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/css/-/css-3.0.0.tgz#4447a4d58fdd03367c516ca9f64ae365cee4aa5d"
+  integrity sha512-DG9pFfwOrzc+hawpmqX/dHYHJG+Bsdb0klhyi1sDneOgGOXy9wQIC8hzyVp1e4NRYDBdxcylvywPkkXCHAzTyQ==
+  dependencies:
+    inherits "^2.0.4"
+    source-map "^0.6.1"
+    source-map-resolve "^0.6.0"
+
 cssesc@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-3.0.0.tgz#37741919903b868565e1c09ea747445cd18983ee"
@@ -10133,6 +10142,14 @@ source-map-resolve@^0.5.0, source-map-resolve@^0.5.2:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
+source-map-resolve@^0.6.0:
+  version "0.6.0"
+  resolved "https://registry.yarnpkg.com/source-map-resolve/-/source-map-resolve-0.6.0.tgz#3d9df87e236b53f16d01e58150fc7711138e5ed2"
+  integrity sha512-KXBr9d/fO/bWo97NXsPIAW1bFSBOuCnjbNTBMO7N59hsv5i9yzRDfcYwwt0l04+VqnKC+EwzvJZIP/qkuMgR/w==
+  dependencies:
+    atob "^2.1.2"
+    decode-uri-component "^0.2.0"
+
 source-map-support@~0.5.12:
   version "0.5.19"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
@@ -10518,7 +10535,7 @@ stylus-loader@^3.0.2:
     lodash.clonedeep "^4.5.0"
     when "~3.6.x"
 
-stylus@^0.54.5, stylus@^0.54.8:
+stylus@^0.54.8:
   version "0.54.8"
   resolved "https://registry.yarnpkg.com/stylus/-/stylus-0.54.8.tgz#3da3e65966bc567a7b044bfe0eece653e099d147"
   integrity sha512-vr54Or4BZ7pJafo2mpf0ZcwA74rpuYCZbxrHBsH8kbcXOwSfvBFwsRfpGO5OD5fhG5HDCFW737PKaawI7OqEAg==
@@ -10532,6 +10549,20 @@ stylus@^0.54.5, stylus@^0.54.8:
     semver "^6.3.0"
     source-map "^0.7.3"
 
+stylus@^0.55.0:
+  version "0.55.0"
+  resolved "https://registry.yarnpkg.com/stylus/-/stylus-0.55.0.tgz#bd404a36dd93fa87744a9dd2d2b1b8450345e5fc"
+  integrity sha512-MuzIIVRSbc8XxHH7FjkvWqkIcr1BvoMZoR/oFuAJDlh7VSaNJzrB4uJ38GRQa+mWjLXODAMzeDe0xi9GYbGwnw==
+  dependencies:
+    css "^3.0.0"
+    debug "~3.1.0"
+    glob "^7.1.6"
+    mkdirp "~1.0.4"
+    safer-buffer "^2.1.2"
+    sax "~1.2.4"
+    semver "^6.3.0"
+    source-map "^0.7.3"
+
 supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"