diff --git a/apps/bootstrap-installer/package.json b/apps/bootstrap-installer/package.json
index 5e72fb283f..c385f9b108 100644
--- a/apps/bootstrap-installer/package.json
+++ b/apps/bootstrap-installer/package.json
@@ -32,7 +32,7 @@
     "clsx": "2.1.1",
     "katex": "0.16.47",
     "lucide-react": "0.577.0",
-    "nanostores": "1.4.0",
+    "nanostores": "1.4.2",
     "radix-ui": "1.6.7",
     "react": "19.2.7",
     "react-dom": "19.2.7",
diff --git a/apps/desktop/package.json b/apps/desktop/package.json
index 300c4582ab..b3f55444c0 100644
--- a/apps/desktop/package.json
+++ b/apps/desktop/package.json
@@ -130,7 +130,7 @@
     "katex": "0.16.47",
     "mermaid": "11.16.1",
     "motion": "12.42.2",
-    "nanostores": "1.4.0",
+    "nanostores": "1.4.2",
     "node-pty": "1.1.0",
     "radix-ui": "1.6.7",
     "react": "19.2.7",
diff --git a/apps/desktop/src/store/nanostores-batch-guard.test.ts b/apps/desktop/src/store/nanostores-batch-guard.test.ts
new file mode 100644
index 0000000000..06f94adc0e
--- /dev/null
+++ b/apps/desktop/src/store/nanostores-batch-guard.test.ts
@@ -0,0 +1,31 @@
+/**
+ * Regression guard: the desktop's gateway-switch publication runs inside
+ * nanostores' batch(). nanostores 1.4.0–1.4.1 annotated batch() with
+ * `/* @__NO_SIDE_EFFECTS__ *\/`, which let production bundlers (Rollup, via
+ * `vite build`) erase result-unused batch(...) calls — callback included —
+ * deleting the entire publication from release builds and freezing
+ * profile/agent switching there. Dev builds and vitest run unminified, so
+ * only the packaged app broke. nanostores 1.4.2 removed the annotation;
+ * this test fails if the installed version ever carries it again.
+ */
+import { readFileSync } from 'node:fs'
+import { createRequire } from 'node:module'
+import path from 'node:path'
+
+import { describe, expect, it } from 'vitest'
+
+const require = createRequire(import.meta.url)
+
+describe('nanostores batch()', () => {
+  it('is not annotated @__NO_SIDE_EFFECTS__ — bundlers would erase its calls', () => {
+    const nanostoresEntry = require.resolve('nanostores')
+    const atomSource = readFileSync(path.join(path.dirname(nanostoresEntry), 'atom/index.js'), 'utf8')
+
+    // Capture any block comment immediately preceding the batch export.
+    const match = atomSource.match(/(\/\*(?:[^*]|\*(?!\/))*\*\/\s*)?export const batch\b/)
+
+    expect(match, 'nanostores atom/index.js should export const batch').toBeTruthy()
+    expect(match![1] ?? '').not.toContain('__NO_SIDE_EFFECTS')
+    expect(match![1] ?? '').not.toContain('__PURE__')
+  })
+})
diff --git a/package-lock.json b/package-lock.json
index 507d5ee0b7..c50dd25d73 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,7 +46,7 @@
         "clsx": "2.1.1",
         "katex": "0.16.47",
         "lucide-react": "0.577.0",
-        "nanostores": "1.4.0",
+        "nanostores": "1.4.2",
         "radix-ui": "1.6.7",
         "react": "19.2.7",
         "react-dom": "19.2.7",
@@ -116,7 +116,7 @@
         "katex": "0.16.47",
         "mermaid": "11.16.1",
         "motion": "12.42.2",
-        "nanostores": "1.4.0",
+        "nanostores": "1.4.2",
         "node-pty": "1.1.0",
         "radix-ui": "1.6.7",
         "react": "19.2.7",
@@ -14527,9 +14527,9 @@
       }
     },
     "node_modules/nanostores": {
-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/nanostores/-/nanostores-1.4.0.tgz",
-      "integrity": "sha512-i0tloweeudshAEuddpDxcg9Ik6pkPfVsHIgKyf143JrgG7/MOh0+q7BypdLXZPoOP7fOYt1eTcwGkyiVmhJFkA==",
+      "version": "1.4.2",
+      "resolved": "https://registry.npmjs.org/nanostores/-/nanostores-1.4.2.tgz",
+      "integrity": "sha512-Wxv8Roefr2nqtiRG0bnaFlpYqpIVtOEeJZHaH+4nGgOK1/7n6OHOuHCb/bhqrNQgZM8fyd0s1PqhdrJc9Ib44g==",
       "funding": [
         {
           "type": "github",
@@ -19127,7 +19127,7 @@
         "@hermes/shared": "file:../apps/shared",
         "@nanostores/react": "1.1.0",
         "ink-text-input": "6.0.0",
-        "nanostores": "1.4.0",
+        "nanostores": "1.4.2",
         "react": "19.2.7",
         "undici": "6.28.0",
         "unicode-animations": "1.0.3"
diff --git a/ui-tui/package.json b/ui-tui/package.json
index f1d0bbe36b..977dbe4c35 100644
--- a/ui-tui/package.json
+++ b/ui-tui/package.json
@@ -23,7 +23,7 @@
     "@hermes/shared": "file:../apps/shared",
     "@nanostores/react": "1.1.0",
     "ink-text-input": "6.0.0",
-    "nanostores": "1.4.0",
+    "nanostores": "1.4.2",
     "react": "19.2.7",
     "undici": "6.28.0",
     "unicode-animations": "1.0.3"