diff --git a/.goreleaser.yml b/.goreleaser.yml
index 559a9f67..fb2c5a13 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -65,12 +65,24 @@ homebrew_casks:
       token: "{{ .Env.HOMEBREW_TAP_TOKEN }}"
     homepage: "https://github.com/mnemon-dev/mnemon"
     description: "Persistent memory and durable agency for LLM agents"
-    hooks:
-      post:
-        install: |
-          if OS.mac?
-            system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{staged_path}/mnemon"]
-          end
+    # The binary is ad hoc/linker-signed only (not notarized), so the cask
+    # download carries com.apple.quarantine and Gatekeeper kills the first
+    # launch. Strip the attribute from the staged binary so the user needs no
+    # manual step.
+    #
+    # `hooks.post.install` renders a `postflight do ... end` block, which
+    # Homebrew deprecates in favor of the declarative `postflight_steps` DSL
+    # (goreleaser/goreleaser#6870). Until GoReleaser ships a steps-aware hook
+    # (goreleaser/goreleaser#6873), emit the stanza through `custom_block`.
+    # The `{{ "{{staged_path}}" }}` quoting escapes GoReleaser's own template
+    # pass so Homebrew's `{{staged_path}}` install-steps token survives into
+    # the generated cask.
+    custom_block: |
+      postflight_steps do
+        on_macos do
+          run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{ "{{staged_path}}" }}/mnemon"]
+        end
+      end
 
 release:
   github:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac722ebd..a620d7a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -53,6 +53,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
   hook registry, but its current local Agent V2 turn path does not dispatch the
   user-prompt lifecycle event needed for reliable automatic recall.
 
+### Fixed
+
+- The generated Homebrew cask no longer emits the deprecated `postflight`
+  stanza. `brew` commands that load the cask printed "Calling `postflight` is
+  deprecated! Use `postflight_steps` instead." on every invocation. The
+  quarantine strip now runs through the declarative `postflight_steps` DSL.
+
 ## [0.2.7] - 2026-09-01
 
 ### Fixed
diff --git a/test/mnemond/architecture/release_distribution_test.go b/test/mnemond/architecture/release_distribution_test.go
index 6dfde2e9..eaa7a462 100644
--- a/test/mnemond/architecture/release_distribution_test.go
+++ b/test/mnemond/architecture/release_distribution_test.go
@@ -4,6 +4,7 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
+	"strings"
 	"testing"
 
 	"go.yaml.in/yaml/v3"
@@ -68,3 +69,46 @@ func TestReleaseDistributionPublishesWindowsArchives(t *testing.T) {
 			windows.GOOS, windows.Formats)
 	}
 }
+
+func TestReleaseCaskEmitsPostflightSteps(t *testing.T) {
+	root := repositoryRoot(t)
+	raw, err := os.ReadFile(filepath.Join(root, ".goreleaser.yml"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var config struct {
+		Casks []struct {
+			Name        string `yaml:"name"`
+			CustomBlock string `yaml:"custom_block"`
+			Hooks       struct {
+				Post struct {
+					Install string `yaml:"install"`
+				} `yaml:"post"`
+			} `yaml:"hooks"`
+		} `yaml:"homebrew_casks"`
+	}
+	if err := yaml.Unmarshal(raw, &config); err != nil {
+		t.Fatalf("parse .goreleaser.yml: %v", err)
+	}
+
+	if len(config.Casks) != 1 {
+		t.Fatalf("homebrew casks = %d, want one", len(config.Casks))
+	}
+	cask := config.Casks[0]
+
+	// hooks.post.install renders Homebrew's deprecated `postflight` stanza
+	// (goreleaser/goreleaser#6870); the quarantine strip must live in
+	// custom_block as `postflight_steps` until a steps-aware hook ships.
+	if cask.Hooks.Post.Install != "" {
+		t.Fatalf("homebrew cask still uses hooks.post.install, which emits the deprecated postflight stanza")
+	}
+	for _, want := range []string{"postflight_steps", "on_macos", "/usr/bin/xattr", `{{ "{{staged_path}}" }}`} {
+		if !strings.Contains(cask.CustomBlock, want) {
+			t.Fatalf("homebrew cask custom_block is missing %q; got:\n%s", want, cask.CustomBlock)
+		}
+	}
+	if strings.Contains(cask.CustomBlock, "postflight do") {
+		t.Fatalf("homebrew cask custom_block still emits deprecated postflight:\n%s", cask.CustomBlock)
+	}
+}