diff --git a/.github/workflows/fix-casks.yml b/.github/workflows/fix-casks.yml
new file mode 100644
index 0000000..43f4b43
--- /dev/null
+++ b/.github/workflows/fix-casks.yml
@@ -0,0 +1,34 @@
+name: Fix GoReleaser casks
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'Casks/**'
+      - 'scripts/fix-casks.sh'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  fix-casks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Rewrite postflight blocks
+        run: scripts/fix-casks.sh
+
+      - name: Commit and push changes
+        run: |
+          if git diff --quiet Casks/; then
+            exit 0
+          fi
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+          git add Casks/
+          git commit -m "fix(casks): rewrite postflight to postflight_steps"
+          git push
diff --git a/Casks/harness-sync.rb b/Casks/harness-sync.rb
index 61cabdf..c271859 100644
--- a/Casks/harness-sync.rb
+++ b/Casks/harness-sync.rb
@@ -33,10 +33,9 @@ cask "harness-sync" do
 
   binary "harness-sync"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/harness-sync"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/harness-sync"]
     end
   end
 
diff --git a/Casks/kportal.rb b/Casks/kportal.rb
index aebc884..67e60b7 100644
--- a/Casks/kportal.rb
+++ b/Casks/kportal.rb
@@ -33,10 +33,9 @@ cask "kportal" do
 
   binary "kportal"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/kportal"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/kportal"]
     end
   end
 
diff --git a/Casks/lolcathost.rb b/Casks/lolcathost.rb
index 7867597..429dd0d 100644
--- a/Casks/lolcathost.rb
+++ b/Casks/lolcathost.rb
@@ -33,10 +33,9 @@ cask "lolcathost" do
 
   binary "lolcathost"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/lolcathost"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/lolcathost"]
     end
   end
 
diff --git a/Casks/mcp-filepuff.rb b/Casks/mcp-filepuff.rb
index cda7a60..5adbf8e 100644
--- a/Casks/mcp-filepuff.rb
+++ b/Casks/mcp-filepuff.rb
@@ -33,10 +33,9 @@ cask "mcp-filepuff" do
 
   binary "mcp-filepuff"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/mcp-filepuff"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/mcp-filepuff"]
     end
   end
 
diff --git a/Casks/readitall.rb b/Casks/readitall.rb
index 9e69705..4e213eb 100644
--- a/Casks/readitall.rb
+++ b/Casks/readitall.rb
@@ -33,10 +33,9 @@ cask "readitall" do
 
   binary "readitall"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/readitall"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/readitall"]
     end
   end
 
diff --git a/Casks/semver-generator.rb b/Casks/semver-generator.rb
index 8c7b2fd..849fd72 100644
--- a/Casks/semver-generator.rb
+++ b/Casks/semver-generator.rb
@@ -33,10 +33,9 @@ cask "semver-generator" do
 
   binary "semver-generator"
 
-  postflight do
-    if OS.mac?
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/semver-generator"]
+  postflight_steps do
+    on_macos do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/semver-generator"]
     end
   end