diff --git a/Casks/kportal.rb b/Casks/kportal.rb
index 9ecf146..0f04fdb 100644
--- a/Casks/kportal.rb
+++ b/Casks/kportal.rb
@@ -1,24 +1,24 @@
 # This file was generated by GoReleaser. DO NOT EDIT.
 cask "kportal" do
-  version "0.13.8"
+  version "0.13.9"
 
   on_macos do
     on_arm do
-      sha256 "8ec0eb06ff6502e743fe3bea81cc6a5ab364a823738d68cc140eb0eda99b5b23"
+      sha256 "b5748cab80ff99224749d91c796308dfe93d8ec425214884ebdec098ffb3923e"
       url "https://github.com/lukaszraczylo/kportal/releases/download/v#{version}/kportal-#{version}-darwin-arm64.tar.gz"
     end
     on_intel do
-      sha256 "0eb7a76a2846e63c885d13864c491d9f05a0aa74ce3c909b4e1bedab6e4b6081"
+      sha256 "a327b2fd64149ceedca6107656b98e86e492fc60999b71fb7dc8416110a232cc"
       url "https://github.com/lukaszraczylo/kportal/releases/download/v#{version}/kportal-#{version}-darwin-amd64.tar.gz"
     end
   end
   on_linux do
     on_arm do
-      sha256 "0e2291757b9b9cc68500b64a4a0c5962727c4bab5b14cd7e58a1dd69439c65f4"
+      sha256 "b0d73a3d2ddc55a3eec7b9495b302763591f2d02e131f8be801bab7004357270"
       url "https://github.com/lukaszraczylo/kportal/releases/download/v#{version}/kportal-#{version}-linux-arm64.tar.gz"
     end
     on_intel do
-      sha256 "3d9fb152daebf114c06aea1636c026d48f01fc6746dbbc145772d3b34645c525"
+      sha256 "f09c9944134a83e5efb9e304844f84967ab2da4aee110fa349b1aaf45e55218b"
       url "https://github.com/lukaszraczylo/kportal/releases/download/v#{version}/kportal-#{version}-linux-amd64.tar.gz"
     end
   end
@@ -33,9 +33,10 @@ cask "kportal" do
 
   binary "kportal"
 
-  postflight_steps do
-    on_macos do
-      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/kportal"]
+  postflight do
+    if OS.mac?
+      system_command "/usr/bin/xattr",
+                     args: ["-dr", "com.apple.quarantine", "#{staged_path}/kportal"]
     end
   end