diff --git a/packages/workflow/package.json b/packages/workflow/package.json
index aeb3a39d..e6c17740 100644
--- a/packages/workflow/package.json
+++ b/packages/workflow/package.json
@@ -81,7 +81,7 @@
     "postcss": "^8.4.41",
     "postcss-flexbugs-fixes": "^5.0.2",
     "postcss-focus": "^6.0.0",
-    "postcss-loader": "^7.3.4",
+    "postcss-loader": "^8.1.1",
     "postcss-preset-env": "^9.6.0",
     "postcss-reporter": "^7.1.0",
     "pretty-ms": "^7.0.1",
diff --git a/yarn.lock b/yarn.lock
index 7db8527b..90afce13 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -665,7 +665,7 @@ __metadata:
     postcss: ^8.4.41
     postcss-flexbugs-fixes: ^5.0.2
     postcss-focus: ^6.0.0
-    postcss-loader: ^7.3.4
+    postcss-loader: ^8.1.1
     postcss-preset-env: ^9.6.0
     postcss-reporter: ^7.1.0
     pretty-ms: ^7.0.1
@@ -12850,7 +12850,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cosmiconfig@npm:^8.1.3, cosmiconfig@npm:^8.3.5":
+"cosmiconfig@npm:^8.1.3":
   version: 8.3.6
   resolution: "cosmiconfig@npm:8.3.6"
   dependencies:
@@ -22695,17 +22695,23 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss-loader@npm:^7.3.4":
-  version: 7.3.4
-  resolution: "postcss-loader@npm:7.3.4"
+"postcss-loader@npm:^8.1.1":
+  version: 8.1.1
+  resolution: "postcss-loader@npm:8.1.1"
   dependencies:
-    cosmiconfig: ^8.3.5
+    cosmiconfig: ^9.0.0
     jiti: ^1.20.0
     semver: ^7.5.4
   peerDependencies:
+    "@rspack/core": 0.x || 1.x
     postcss: ^7.0.0 || ^8.0.1
     webpack: ^5.0.0
-  checksum: f109eb266580eb296441a1ae057f93629b9b79ad962bdd3fc134417180431606a5419b6f5848c31e6d92c818e71fe96e4335a85cc5332c2f7b14e2869951e5b3
+  peerDependenciesMeta:
+    "@rspack/core":
+      optional: true
+    webpack:
+      optional: true
+  checksum: b09e230181ff70b374a3e265dc526302b9865e2697b5f9c4ff78dfeb716a3508f3247ed49c8ee6630dddfdf6df7d73556d6bd2eb165a00c48dba3a1bd01e3a2e
   languageName: node
   linkType: hard