diff --git a/.github/workflows/i18n.yml b/.github/workflows/i18n.yml
index 507c0fa1..b8b03f54 100644
--- a/.github/workflows/i18n.yml
+++ b/.github/workflows/i18n.yml
@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Crowdin
         uses: crowdin/github-action@v2
diff --git a/webui/eslint.config.js b/webui/eslint.config.js
index 8378b436..00e29960 100644
--- a/webui/eslint.config.js
+++ b/webui/eslint.config.js
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import js from "@eslint/js";
 import tseslint from "typescript-eslint";
 import solid from "eslint-plugin-solid";
diff --git a/webui/pnpm-lock.yaml b/webui/pnpm-lock.yaml
index 761787cc..aadc43bf 100644
--- a/webui/pnpm-lock.yaml
+++ b/webui/pnpm-lock.yaml
@@ -1,3 +1,6 @@
+# Copyright 2026 Hybrid Mount Developers
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 lockfileVersion: '9.0'
 
 settings:
diff --git a/webui/src/app.css b/webui/src/app.css
index a205a243..f6b339d9 100644
--- a/webui/src/app.css
+++ b/webui/src/app.css
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 :root {
   --md-sys-shape-corner-medium: 12px;
   --md-sys-shape-corner-large: 16px;
diff --git a/webui/src/components/Skeleton.tsx b/webui/src/components/Skeleton.tsx
index 4684bd59..05146ff5 100644
--- a/webui/src/components/Skeleton.tsx
+++ b/webui/src/components/Skeleton.tsx
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import "./Skeleton.css";
 
 interface Props {
diff --git a/webui/src/components/TopBar.css b/webui/src/components/TopBar.css
index 0ad8d5b8..d9e2c92a 100644
--- a/webui/src/components/TopBar.css
+++ b/webui/src/components/TopBar.css
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 .top-bar {
   flex-shrink: 0;
   background-color: var(--md-sys-color-surface-container);
diff --git a/webui/src/components/TopBar.tsx b/webui/src/components/TopBar.tsx
index c55f92ab..b0e4ac08 100644
--- a/webui/src/components/TopBar.tsx
+++ b/webui/src/components/TopBar.tsx
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { Show, For } from "solid-js";
 import { store } from "../lib/store";
 import { ICONS } from "../lib/constants";
diff --git a/webui/src/lib/api.mock.ts b/webui/src/lib/api.mock.ts
index 383bd2ea..122d312f 100644
--- a/webui/src/lib/api.mock.ts
+++ b/webui/src/lib/api.mock.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { APP_VERSION } from "./constants_gen";
 import { DEFAULT_CONFIG } from "./constants";
 import type {
diff --git a/webui/src/lib/api.ts b/webui/src/lib/api.ts
index e9b9e431..f128daa4 100644
--- a/webui/src/lib/api.ts
+++ b/webui/src/lib/api.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { DEFAULT_CONFIG, PATHS } from "./constants";
 import { APP_VERSION } from "./constants_gen";
 import { MockAPI } from "./api.mock";
diff --git a/webui/src/lib/store.ts b/webui/src/lib/store.ts
index bf751f58..40ae28e5 100644
--- a/webui/src/lib/store.ts
+++ b/webui/src/lib/store.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { createSignal, createMemo, createEffect, createRoot } from "solid-js";
 import { API } from "./api";
 import { DEFAULT_CONFIG, DEFAULT_SEED } from "./constants";
diff --git a/webui/src/lib/theme.ts b/webui/src/lib/theme.ts
index 58c1dfba..a3034964 100644
--- a/webui/src/lib/theme.ts
+++ b/webui/src/lib/theme.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import {
   argbFromHex,
   hexFromArgb,
diff --git a/webui/src/material-web.d.ts b/webui/src/material-web.d.ts
index 6e7731c2..eb17df35 100644
--- a/webui/src/material-web.d.ts
+++ b/webui/src/material-web.d.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import type { JSX } from "solid-js";
 
 type BaseProps = JSX.HTMLAttributes<HTMLElement>;
diff --git a/webui/src/routes/GranaryTab.tsx b/webui/src/routes/GranaryTab.tsx
index dd805072..01d48535 100644
--- a/webui/src/routes/GranaryTab.tsx
+++ b/webui/src/routes/GranaryTab.tsx
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { createSignal, createMemo, onMount, Show, For } from "solid-js";
 import { API } from "../lib/api";
 import { store } from "../lib/store";
diff --git a/webui/src/routes/InfoTab.tsx b/webui/src/routes/InfoTab.tsx
index 5fc81efd..1d6c6bdf 100644
--- a/webui/src/routes/InfoTab.tsx
+++ b/webui/src/routes/InfoTab.tsx
@@ -1,3 +1,8 @@
+/**
+ * Copyright 2026 Hybrid Mount Developers
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
 import { createSignal, onMount, Show, For, createMemo } from "solid-js";
 import { store } from "../lib/store";
 import { API } from "../lib/api";