diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 303c295..2736110 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -180,6 +180,21 @@ jobs:
 
             app "Vista.app"
 
+            # brew upgrade replaces the bundle but leaves the old process
+            # running the stale binary. `uninstall quit:` Cmd-Q's it during the
+            # upgrade and `postflight` relaunches the freshly installed one, so
+            # the new version is what's actually running afterwards. (Stanza
+            # order is Homebrew-canonical: postflight before uninstall.)
+            postflight do
+              # Launch on every install (Gordon's call — it's a menu-bar
+              # indexer, so starting it right away is the point). `|| true`
+              # keeps a failed launch (e.g. a headless/non-GUI install) from
+              # aborting the install itself.
+              system_command "/bin/sh", args: ["-c", "/usr/bin/open -a Vista || true"]
+            end
+
+            uninstall quit: "com.gordonbeeming.vista"
+
             zap trash: [
               "~/Library/Application Support/Vista",
               "~/Library/Caches/com.gordonbeeming.vista",
diff --git a/Scripts/package-for-homebrew.sh b/Scripts/package-for-homebrew.sh
index 4e0c9d3..b4bda36 100755
--- a/Scripts/package-for-homebrew.sh
+++ b/Scripts/package-for-homebrew.sh
@@ -69,6 +69,16 @@ cask "vista" do
 
   app "Vista.app"
 
+  # Keep in sync with the CI cask in .github/workflows/build.yml.
+  # brew upgrade replaces the bundle but leaves the old process running the
+  # stale binary, so quit it on upgrade and relaunch the freshly installed
+  # one. `|| true` keeps a failed launch (headless install) non-fatal.
+  postflight do
+    system_command "/bin/sh", args: ["-c", "/usr/bin/open -a Vista || true"]
+  end
+
+  uninstall quit: "com.gordonbeeming.vista"
+
   zap trash: [
     "~/Library/Application Support/Vista",
     "~/Library/Caches/com.gordonbeeming.vista",