diff --git a/env/userstyle/package.json b/env/userstyle/package.json
index 815e95db7c2..e746bbf6996 100644
--- a/env/userstyle/package.json
+++ b/env/userstyle/package.json
@@ -28,7 +28,7 @@
     "autoprefixer": "10.4.14",
     "concurrently": "8.2.0",
     "eslint": "8.45.0",
-    "postcss": "8.4.31",
+    "postcss": "8.5.1",
     "postcss-cli": "10.1.0",
     "postcss-scss": "4.0.6",
     "prettier": "3.0.0",
diff --git a/yarn.lock b/yarn.lock
index 2bcaa8dfee4..ed97cd64b9a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3923,7 +3923,7 @@ __metadata:
     autoprefixer: "npm:10.4.14"
     concurrently: "npm:8.2.0"
     eslint: "npm:8.45.0"
-    postcss: "npm:8.4.31"
+    postcss: "npm:8.5.1"
     postcss-cli: "npm:10.1.0"
     postcss-scss: "npm:4.0.6"
     prettier: "npm:3.0.0"
@@ -11368,7 +11368,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:3.3.8":
+"nanoid@npm:3.3.8, nanoid@npm:^3.3.8":
   version: 3.3.8
   resolution: "nanoid@npm:3.3.8"
   bin:
@@ -11377,7 +11377,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.3.6, nanoid@npm:^3.3.7":
+"nanoid@npm:^3.3.7":
   version: 3.3.7
   resolution: "nanoid@npm:3.3.7"
   bin:
@@ -12018,6 +12018,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"picocolors@npm:^1.1.1":
+  version: 1.1.1
+  resolution: "picocolors@npm:1.1.1"
+  checksum: e2e3e8170ab9d7c7421969adaa7e1b31434f789afb9b3f115f6b96d91945041ac3ceb02e9ec6fe6510ff036bcc0bf91e69a1772edc0b707e12b19c0f2d6bcf58
+  languageName: node
+  linkType: hard
+
 "picomatch@npm:^2.0.4, picomatch@npm:^2.2.1, picomatch@npm:^2.3.1":
   version: 2.3.1
   resolution: "picomatch@npm:2.3.1"
@@ -12153,14 +12160,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.4.31":
-  version: 8.4.31
-  resolution: "postcss@npm:8.4.31"
+"postcss@npm:8.5.1":
+  version: 8.5.1
+  resolution: "postcss@npm:8.5.1"
   dependencies:
-    nanoid: "npm:^3.3.6"
-    picocolors: "npm:^1.0.0"
-    source-map-js: "npm:^1.0.2"
-  checksum: 748b82e6e5fc34034dcf2ae88ea3d11fd09f69b6c50ecdd3b4a875cfc7cdca435c958b211e2cb52355422ab6fccb7d8f2f2923161d7a1b281029e4a913d59acf
+    nanoid: "npm:^3.3.8"
+    picocolors: "npm:^1.1.1"
+    source-map-js: "npm:^1.2.1"
+  checksum: c4d90c59c98e8a0c102b77d3f4cac190f883b42d63dc60e2f3ed840f16197c0c8e25a4327d2e9a847b45a985612317dc0534178feeebd0a1cf3eb0eecf75cae4
   languageName: node
   linkType: hard
 
@@ -13547,13 +13554,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"source-map-js@npm:>=0.6.2 <2.0.0, source-map-js@npm:^1.0.1, source-map-js@npm:^1.0.2, source-map-js@npm:^1.2.0":
+"source-map-js@npm:>=0.6.2 <2.0.0, source-map-js@npm:^1.0.1, source-map-js@npm:^1.2.0":
   version: 1.2.0
   resolution: "source-map-js@npm:1.2.0"
   checksum: 7e5f896ac10a3a50fe2898e5009c58ff0dc102dcb056ed27a354623a0ece8954d4b2649e1a1b2b52ef2e161d26f8859c7710350930751640e71e374fe2d321a4
   languageName: node
   linkType: hard
 
+"source-map-js@npm:^1.2.1":
+  version: 1.2.1
+  resolution: "source-map-js@npm:1.2.1"
+  checksum: 7bda1fc4c197e3c6ff17de1b8b2c20e60af81b63a52cb32ec5a5d67a20a7d42651e2cb34ebe93833c5a2a084377e17455854fee3e21e7925c64a51b6a52b0faf
+  languageName: node
+  linkType: hard
+
 "source-map-support@npm:0.5.21":
   version: 0.5.21
   resolution: "source-map-support@npm:0.5.21"