diff --git a/app/(docs)/@chat/chat/[chatId]/page.tsx b/app/(docs)/@chat/chat/[chatId]/page.tsx
index 35462ced..8f5d1fd9 100644
--- a/app/(docs)/@chat/chat/[chatId]/page.tsx
+++ b/app/(docs)/@chat/chat/[chatId]/page.tsx
@@ -6,7 +6,7 @@ import {
 } from "@/lib/chatHistory";
 import { getMarkdownSections, getPagesList } from "@/lib/docs";
 import { ChatAreaContainer, ChatAreaContent } from "./chatArea";
-import { unstable_cacheLife, unstable_cacheTag } from "next/cache";
+import { cacheLife, cacheTag } from "next/cache";
 import { isCloudflare } from "@/lib/detectCloudflare";
 
 export default async function ChatPage({
@@ -56,8 +56,8 @@ export default async function ChatPage({
 
 async function getChatOneFromCache(chatId: string, userId?: string) {
   "use cache";
-  unstable_cacheLife("days");
-  unstable_cacheTag(cacheKeyForChat(chatId));
+  cacheLife("days");
+  cacheTag(cacheKeyForChat(chatId));
 
   if (!userId) {
     return null;
diff --git a/app/(docs)/@docs/[lang]/[pageId]/page.tsx b/app/(docs)/@docs/[lang]/[pageId]/page.tsx
index cd825e8c..b1be47b8 100644
--- a/app/(docs)/@docs/[lang]/[pageId]/page.tsx
+++ b/app/(docs)/@docs/[lang]/[pageId]/page.tsx
@@ -14,7 +14,7 @@ import {
   PagePath,
   PageSlug,
 } from "@/lib/docs";
-import { unstable_cacheLife, unstable_cacheTag } from "next/cache";
+import { cacheLife, cacheTag } from "next/cache";
 import { isCloudflare } from "@/lib/detectCloudflare";
 import { DocsAutoRedirect } from "./autoRedirect";
 
@@ -83,12 +83,12 @@ async function getChatFromCache(path: PagePath, userId?: string) {
   // 一方、use cacheの関数内でheaders()にはアクセスできない。
   // したがって、外でheaders()を使ってuserIdを取得した後、関数の中で再度drizzleを初期化しないといけない。
   "use cache";
-  unstable_cacheLife("days");
+  cacheLife("days");
 
   if (!userId) {
     return [];
   }
-  unstable_cacheTag(cacheKeyForPage(path, userId));
+  cacheTag(cacheKeyForPage(path, userId));
 
   if (isCloudflare()) {
     const cache = await caches.open("chatHistory");
diff --git a/app/(docs)/@docs/[lang]/[pageId]/pageContent.tsx b/app/(docs)/@docs/[lang]/[pageId]/pageContent.tsx
index fe075476..007c75a9 100644
--- a/app/(docs)/@docs/[lang]/[pageId]/pageContent.tsx
+++ b/app/(docs)/@docs/[lang]/[pageId]/pageContent.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { Fragment, useCallback, useEffect, useRef, useState } from "react";
+import { Fragment, useEffect, useMemo, useRef, useState } from "react";
 import { ChatForm } from "./chatForm";
 import { StyledMarkdown } from "@/markdown/markdown";
 import { useSidebarMdContext } from "@/sidebar";
@@ -32,11 +32,41 @@ export function PageContent(props: PageContentProps) {
   const { setSidebarMdContent } = useSidebarMdContext();
   const { splitMdContent, pageEntry, path, chatHistories } = props;
 
-  const initDynamicMdContent = useCallback(() => {
+  const [sectionInView, setSectionInView] = useState<boolean[]>([]);
+  const sectionRefs = useRef<Array<HTMLDivElement | null>>([]);
+  useEffect(() => {
+    const handleScroll = () => {
+      setSectionInView((sectionInView) => {
+        sectionInView = sectionInView.slice(); // Reactの変更検知のために新しい配列を作成
+        for (
+          let i = 0;
+          i < sectionRefs.current.length || i < sectionInView.length;
+          i++
+        ) {
+          if (sectionRefs.current.at(i)) {
+            const rect = sectionRefs.current.at(i)!.getBoundingClientRect();
+            sectionInView[i] =
+              rect.top < window.innerHeight * 0.9 &&
+              rect.bottom >= window.innerHeight * 0.1;
+          } else {
+            sectionInView[i] = false;
+          }
+        }
+        return sectionInView;
+      });
+    };
+    window.addEventListener("scroll", handleScroll);
+    handleScroll();
+    return () => {
+      window.removeEventListener("scroll", handleScroll);
+    };
+  }, []);
+
+  const dynamicMdContent = useMemo(() => {
     const newContent: DynamicMarkdownSection[] = splitMdContent.map(
-      (section) => ({
+      (section, i) => ({
         ...section,
-        inView: false,
+        inView: sectionInView[i],
         replacedContent: section.rawContent,
         replacedRange: [],
       })
@@ -94,54 +124,13 @@ export function PageContent(props: PageContentProps) {
     }
 
     return newContent;
-  }, [splitMdContent, chatHistories]);
-
-  // SSR用のローカルstate
-  const [dynamicMdContent, setDynamicMdContent] = useState<
-    DynamicMarkdownSection[]
-  >(() => initDynamicMdContent());
+  }, [splitMdContent, chatHistories, sectionInView]);
 
   useEffect(() => {
     // props.splitMdContentが変わったとき, チャットのdiffが変わった時に
-    // ローカルstateとcontextの両方を更新
-    const newContent = initDynamicMdContent();
-    setDynamicMdContent(newContent);
-    setSidebarMdContent(path, newContent);
-  }, [initDynamicMdContent, path, setSidebarMdContent]);
-
-  const sectionRefs = useRef<Array<HTMLDivElement | null>>([]);
-  // sectionRefsの長さをsplitMdContentに合わせる
-  while (sectionRefs.current.length < props.splitMdContent.length) {
-    sectionRefs.current.push(null);
-  }
-
-  useEffect(() => {
-    const handleScroll = () => {
-      const updateContent = (
-        prevDynamicMdContent: DynamicMarkdownSection[]
-      ) => {
-        const dynMdContent = prevDynamicMdContent.slice(); // Reactの変更検知のために新しい配列を作成
-        for (let i = 0; i < sectionRefs.current.length; i++) {
-          if (sectionRefs.current.at(i) && dynMdContent.at(i)) {
-            const rect = sectionRefs.current.at(i)!.getBoundingClientRect();
-            dynMdContent.at(i)!.inView =
-              rect.top < window.innerHeight * 0.9 &&
-              rect.bottom >= window.innerHeight * 0.1;
-          }
-        }
-        return dynMdContent;
-      };
-
-      // ローカルstateとcontextの両方を更新
-      setDynamicMdContent(updateContent);
-      setSidebarMdContent(path, updateContent);
-    };
-    window.addEventListener("scroll", handleScroll);
-    handleScroll();
-    return () => {
-      window.removeEventListener("scroll", handleScroll);
-    };
-  }, [setSidebarMdContent, path]);
+    // sidebarのcontextを更新
+    setSidebarMdContent(path, dynamicMdContent);
+  }, [dynamicMdContent, path, setSidebarMdContent]);
 
   const [isFormVisible, setIsFormVisible] = useState(false);
 
diff --git a/app/lib/chatHistory.ts b/app/lib/chatHistory.ts
index e1392102..2158941f 100644
--- a/app/lib/chatHistory.ts
+++ b/app/lib/chatHistory.ts
@@ -4,7 +4,7 @@ import { getDrizzle } from "./drizzle";
 import { chat, diff, message, section } from "@/schema/chat";
 import { and, asc, eq, exists } from "drizzle-orm";
 import { Auth } from "better-auth";
-import { revalidateTag } from "next/cache";
+import { updateTag } from "next/cache";
 import { isCloudflare } from "./detectCloudflare";
 import { getPagesList, LangId, PagePath, PageSlug, SectionId } from "./docs";
 
@@ -31,7 +31,6 @@ export function cacheKeyForChat(chatId: string) {
 // nextjsのキャッシュのrevalidateはRouteHandlerではなくServerActionから呼ばないと正しく動作しないらしい。
 // https://github.com/vercel/next.js/issues/69064
 // そのためlib/以下の関数では直接revalidateChatを呼ばず、ServerActionの関数から呼ぶようにする。
-// Nextjs 16 に更新したらこれをupdateTag()で置き換える。
 export async function revalidateChat(
   chatId: string,
   userId: string,
@@ -41,8 +40,8 @@ export async function revalidateChat(
     const [lang, page] = pagePath.split("/") as [LangId, PageSlug];
     pagePath = { lang, page };
   }
-  revalidateTag(cacheKeyForChat(chatId));
-  revalidateTag(cacheKeyForPage(pagePath, userId));
+  updateTag(cacheKeyForChat(chatId));
+  updateTag(cacheKeyForPage(pagePath, userId));
   if (isCloudflare()) {
     const cache = await caches.open("chatHistory");
     await cache.delete(cacheKeyForChat(chatId));
@@ -283,7 +282,7 @@ export async function migrateChatUser(oldUserId: string, newUserId: string) {
   const pagesList = await getPagesList();
   for (const lang of pagesList) {
     for (const page of lang.pages) {
-      revalidateTag(
+      updateTag(
         cacheKeyForPage({ lang: lang.id, page: page.slug }, newUserId)
       );
     }
diff --git a/app/lib/clientOnly.ts b/app/lib/clientOnly.ts
new file mode 100644
index 00000000..3e9515e9
--- /dev/null
+++ b/app/lib/clientOnly.ts
@@ -0,0 +1,12 @@
+"use client";
+
+import { useSyncExternalStore } from "react";
+
+// --- SSR無効化のためのカスタムフック準備 ---
+const subscribe = () => () => {};
+const getSnapshot = () => true; // クライアントでは true
+const getServerSnapshot = () => false; // サーバーでは false
+
+export function useIsClient() {
+  return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
+}
diff --git a/app/markdown/styledSyntaxHighlighter.tsx b/app/markdown/styledSyntaxHighlighter.tsx
index 6203c561..6bfd7f46 100644
--- a/app/markdown/styledSyntaxHighlighter.tsx
+++ b/app/markdown/styledSyntaxHighlighter.tsx
@@ -5,9 +5,10 @@ import {
   tomorrow,
   tomorrowNight,
 } from "react-syntax-highlighter/dist/esm/styles/hljs";
-import { lazy, Suspense, useEffect, useState } from "react";
+import { lazy, Suspense } from "react";
 import { LangConstants } from "@my-code/runtime/languages";
 import clsx from "clsx";
+import { useIsClient } from "@/lib/clientOnly";
 
 // SyntaxHighlighterはファイルサイズがでかいので & HydrationErrorを起こすので、SSRを無効化する
 const SyntaxHighlighter = lazy(() => {
@@ -24,11 +25,8 @@ export function StyledSyntaxHighlighter(props: {
 }) {
   const theme = useChangeTheme();
   const codetheme = theme === "tomorrow" ? tomorrow : tomorrowNight;
-  const [initHighlighter, setInitHighlighter] = useState(false);
-  useEffect(() => {
-    setInitHighlighter(true);
-  }, []);
-  return initHighlighter ? (
+  const isClient = useIsClient();
+  return isClient ? (
     <Suspense fallback={<FallbackPre>{props.children}</FallbackPre>}>
       <SyntaxHighlighter
         language={props.language.rsh}
diff --git a/app/sidebar.tsx b/app/sidebar.tsx
index 5f2b6a3f..ac1787d3 100644
--- a/app/sidebar.tsx
+++ b/app/sidebar.tsx
@@ -15,7 +15,6 @@ import {
   ReactNode,
   useCallback,
   useContext,
-  useEffect,
   useState,
 } from "react";
 import clsx from "clsx";
@@ -100,22 +99,17 @@ export function Sidebar({ pagesList }: { pagesList: LanguageEntry[] }) {
 
   // 目次の開閉状態
   const [detailsOpen, setDetailsOpen] = useState<boolean[]>([]);
-  const currentLangIndex = pagesList.findIndex(
-    (group) => currentLang === group.id
-  );
-  useEffect(() => {
-    // 表示しているグループが変わったときに現在のグループのdetailsを開く
-    if (currentLangIndex !== -1) {
-      setDetailsOpen((detailsOpen) => {
-        const newDetailsOpen = [...detailsOpen];
-        while (newDetailsOpen.length <= currentLangIndex) {
-          newDetailsOpen.push(false);
-        }
-        newDetailsOpen[currentLangIndex] = true;
-        return newDetailsOpen;
-      });
-    }
-  }, [currentLangIndex]);
+  const [prevLangIndex, setPrevLangIndex] = useState<number>(-1);
+  const langIndex = pagesList.findIndex((group) => currentLang === group.id);
+  // 表示しているグループが変わったときに現在のグループのdetailsを開く
+  if (prevLangIndex !== langIndex) {
+    setPrevLangIndex(langIndex);
+    setDetailsOpen((detailsOpen) => {
+      const newDetailsOpen = [...detailsOpen];
+      newDetailsOpen[langIndex] = true;
+      return newDetailsOpen;
+    });
+  }
 
   return (
     <div className="bg-base-200 h-full w-sidebar flex flex-col relative">
diff --git a/app/terminal/embedContext.tsx b/app/terminal/embedContext.tsx
index 4f4fc8d3..1c3eaadb 100644
--- a/app/terminal/embedContext.tsx
+++ b/app/terminal/embedContext.tsx
@@ -7,7 +7,6 @@ import {
   ReactNode,
   useCallback,
   useContext,
-  useEffect,
   useState,
 } from "react";
 
@@ -58,7 +57,7 @@ export function useEmbedContext() {
 export function EmbedContextProvider({ children }: { children: ReactNode }) {
   const pathname = usePathname();
 
-  const [currentPathname, setCurrentPathname] = useState<PagePathname>("");
+  const [prevPathname, setPrevPathname] = useState<PagePathname>("");
   const [files, setFiles] = useState<
     Record<PagePathname, Record<Filename, string>>
   >({});
@@ -72,15 +71,12 @@ export function EmbedContextProvider({ children }: { children: ReactNode }) {
   const [execResults, setExecResults] = useState<
     Record<Filename, ReplOutput[]>
   >({});
-  // pathnameが変わったらデータを初期化
-  useEffect(() => {
-    if (pathname && pathname !== currentPathname) {
-      setCurrentPathname(pathname);
-      setReplOutputs({});
-      setCommandIdCounters({});
-      setExecResults({});
-    }
-  }, [pathname, currentPathname]);
+  if (pathname && pathname !== prevPathname) {
+    setPrevPathname(pathname);
+    setReplOutputs({});
+    setCommandIdCounters({});
+    setExecResults({});
+  }
 
   const writeFile = useCallback(
     (updatedFiles: Record<Filename, string>) => {
diff --git a/app/terminal/exec.tsx b/app/terminal/exec.tsx
index a2bc1cc6..89b63870 100644
--- a/app/terminal/exec.tsx
+++ b/app/terminal/exec.tsx
@@ -77,8 +77,8 @@ export function ExecFile(props: ExecProps) {
   >("idle");
   useEffect(() => {
     if (executionState === "triggered" && ready) {
-      setExecutionState("executing");
       (async () => {
+        setExecutionState("executing");
         clearTerminal(terminalInstanceRef.current!);
         terminalInstanceRef.current!.write(systemMessageColor("実行中です..."));
         // TODO: 1つのファイル名しか受け付けないところに無理やりコンマ区切りで全部のファイル名を突っ込んでいる
diff --git a/app/terminal/page.tsx b/app/terminal/page.tsx
index fc9f4741..17c65a0e 100644
--- a/app/terminal/page.tsx
+++ b/app/terminal/page.tsx
@@ -2,7 +2,7 @@
 
 import { Heading } from "@/markdown/heading";
 import "mocha/mocha.css";
-import { Fragment, useEffect, useState } from "react";
+import { Fragment, useEffect, useRef, useState } from "react";
 import { langConstants, RuntimeLang } from "@my-code/runtime/languages";
 import { ReplTerminal } from "./repl";
 import { EditorComponent } from "./editor";
@@ -202,7 +202,11 @@ function AnsiColorSample() {
 }
 
 function MochaTest() {
-  const runtimeRef = useRuntimeAll();
+  const runtimeAll = useRuntimeAll();
+  const runtimeRef = useRef(runtimeAll);
+  for (const lang of Object.keys(runtimeAll) as RuntimeLang[]) {
+    runtimeRef.current[lang] = runtimeAll[lang];
+  }
 
   const [searchParams, setSearchParams] = useState<string>("");
   useEffect(() => {
diff --git a/eslint.config.mjs b/eslint.config.mjs
index ead83e30..74b56a0a 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -1,17 +1,22 @@
-import { dirname } from "path";
-import { fileURLToPath } from "url";
-import { FlatCompat } from "@eslint/eslintrc";
-
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = dirname(__filename);
-
-const compat = new FlatCompat({
-  baseDirectory: __dirname,
-});
+import nextCoreWebVitals from "eslint-config-next/core-web-vitals";
+import nextTypescript from "eslint-config-next/typescript";
+import reactHooks from "eslint-plugin-react-hooks";
 
 const eslintConfig = [
-  ...compat.config({
-    extends: ["next/core-web-vitals", "next/typescript"],
+  {
+    ignores: [
+      ".next/**",
+      ".open-next/**",
+      ".wrangler/**",
+      "node_modules/**",
+      "public/**",
+      "cloudflare-env.d.ts",
+    ],
+  },
+  ...nextCoreWebVitals,
+  ...nextTypescript,
+  {
+    plugins: { "react-hooks": reactHooks },
     rules: {
       // Next.jsのデフォルト設定を上書き
       "@typescript-eslint/no-unused-vars": [
@@ -23,7 +28,7 @@ const eslintConfig = [
         },
       ],
     },
-  }),
+  },
 ];
 
 export default eslintConfig;
diff --git a/next.config.ts b/next.config.ts
index 724528dc..5c237c16 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -11,9 +11,6 @@ const nextConfig: NextConfig = {
   experimental: {
     useCache: true,
   },
-  eslint: {
-    ignoreDuringBuilds: true,
-  },
   typescript: {
     ignoreBuildErrors: true,
   },
@@ -45,7 +42,7 @@ const nextConfig: NextConfig = {
       },
     ];
   },
-  webpack: (config, { isServer }) => {
+  webpack: (config) => {
     config.plugins.push(
       new PyodidePlugin({
         // public/ 以下に書き出すと404
diff --git a/package-lock.json b/package-lock.json
index 7e70b1c7..3436ca10 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "@fontsource-variable/inconsolata": "^5.2.7",
         "@fontsource/m-plus-rounded-1c": "^5.2.9",
         "@google/genai": "^1.21.0",
-        "@opennextjs/cloudflare": "^1.16.1",
+        "@opennextjs/cloudflare": "^1.18.0",
         "@xterm/addon-fit": "^0.11.0",
         "@xterm/xterm": "^6.1.0-beta.168",
         "ace-builds": "^1.43.2",
@@ -25,7 +25,7 @@
         "drizzle-orm": "^0.44.7",
         "js-yaml": "^4.1.1",
         "mocha": "^11.7.4",
-        "next": "^15.5.14",
+        "next": "^16.2.1",
         "pg": "^8.16.3",
         "prismjs": "^1.30.0",
         "react": "^19",
@@ -41,7 +41,6 @@
         "zod": "^4.0.17"
       },
       "devDependencies": {
-        "@eslint/eslintrc": "^3",
         "@pyodide/webpack-plugin": "^1.4.0",
         "@tailwindcss/postcss": "^4",
         "@types/js-yaml": "^4.0.9",
@@ -57,7 +56,7 @@
         "daisyui": "^5.5.5",
         "drizzle-kit": "^0.31.5",
         "eslint": "^9",
-        "eslint-config-next": "^15.5.14",
+        "eslint-config-next": "^16.2.1",
         "fonteditor-core": "^2.6.3",
         "pako": "^2.1.0",
         "prettier": "^3.6.2",
@@ -3585,15 +3584,15 @@
       }
     },
     "node_modules/@next/env": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/env/-/env-15.5.14.tgz",
-      "integrity": "sha512-aXeirLYuASxEgi4X4WhfXsShCFxWDfNn/8ZeC5YXAS2BB4A8FJi1kwwGL6nvMVboE7fZCzmJPNdMvVHc8JpaiA==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/@next/env/-/env-16.2.1.tgz",
+      "integrity": "sha512-n8P/HCkIWW+gVal2Z8XqXJ6aB3J0tuM29OcHpCsobWlChH/SITBs1DFBk/HajgrwDkqqBXPbuUuzgDvUekREPg==",
       "license": "MIT"
     },
     "node_modules/@next/eslint-plugin-next": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/eslint-plugin-next/-/eslint-plugin-next-15.5.14.tgz",
-      "integrity": "sha512-ogBjgsFrPPz19abP3VwcYSahbkUOMMvJjxCOYWYndw+PydeMuLuB4XrvNkNutFrTjC9St2KFULRdKID8Sd/CMQ==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/@next/eslint-plugin-next/-/eslint-plugin-next-16.2.1.tgz",
+      "integrity": "sha512-r0epZGo24eT4g08jJlg2OEryBphXqO8aL18oajoTKLzHJ6jVr6P6FI58DLMug04MwD3j8Fj0YK0slyzneKVyzA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3601,9 +3600,9 @@
       }
     },
     "node_modules/@next/swc-darwin-arm64": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-arm64/-/swc-darwin-arm64-15.5.14.tgz",
-      "integrity": "sha512-Y9K6SPzobnZvrRDPO2s0grgzC+Egf0CqfbdvYmQVaztV890zicw8Z8+4Vqw8oPck8r1TjUHxVh8299Cg4TrxXg==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/@next/swc-darwin-arm64/-/swc-darwin-arm64-16.2.1.tgz",
+      "integrity": "sha512-BwZ8w8YTaSEr2HIuXLMLxIdElNMPvY9fLqb20LX9A9OMGtJilhHLbCL3ggyd0TwjmMcTxi0XXt+ur1vWUoxj2Q==",
       "cpu": [
         "arm64"
       ],
@@ -3617,9 +3616,9 @@
       }
     },
     "node_modules/@next/swc-darwin-x64": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-x64/-/swc-darwin-x64-15.5.14.tgz",
-      "integrity": "sha512-aNnkSMjSFRTOmkd7qoNI2/rETQm/vKD6c/Ac9BZGa9CtoOzy3c2njgz7LvebQJ8iPxdeTuGnAjagyis8a9ifBw==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/@next/swc-darwin-x64/-/swc-darwin-x64-16.2.1.tgz",
+      "integrity": "sha512-/vrcE6iQSJq3uL3VGVHiXeaKbn8Es10DGTGRJnRZlkNQQk3kaNtAJg8Y6xuAlrx/6INKVjkfi5rY0iEXorZ6uA==",
       "cpu": [
         "x64"
       ],
@@ -3633,9 +3632,9 @@
       }
     },
     "node_modules/@next/swc-linux-arm64-gnu": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-gnu/-/swc-linux-arm64-gnu-15.5.14.tgz",
-      "integrity": "sha512-tjlpia+yStPRS//6sdmlVwuO1Rioern4u2onafa5n+h2hCS9MAvMXqpVbSrjgiEOoCs0nJy7oPOmWgtRRNSM5Q==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-gnu/-/swc-linux-arm64-gnu-16.2.1.tgz",
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-        "@typescript-eslint/eslint-plugin": "^5.4.2 || ^6.0.0 || ^7.0.0 || ^8.0.0",
-        "@typescript-eslint/parser": "^5.4.2 || ^6.0.0 || ^7.0.0 || ^8.0.0",
+        "@next/eslint-plugin-next": "16.2.1",
         "eslint-import-resolver-node": "^0.3.6",
         "eslint-import-resolver-typescript": "^3.5.2",
-        "eslint-plugin-import": "^2.31.0",
+        "eslint-plugin-import": "^2.32.0",
         "eslint-plugin-jsx-a11y": "^6.10.0",
         "eslint-plugin-react": "^7.37.0",
-        "eslint-plugin-react-hooks": "^5.0.0"
+        "eslint-plugin-react-hooks": "^7.0.0",
+        "globals": "16.4.0",
+        "typescript-eslint": "^8.46.0"
       },
       "peerDependencies": {
-        "eslint": "^7.23.0 || ^8.0.0 || ^9.0.0",
+        "eslint": ">=9.0.0",
         "typescript": ">=3.3.1"
       },
       "peerDependenciesMeta": {
@@ -11052,6 +11042,19 @@
         }
       }
     },
+    "node_modules/eslint-config-next/node_modules/globals": {
+      "version": "16.4.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-16.4.0.tgz",
+      "integrity": "sha512-ob/2LcVVaVGCYN+r14cnwnoDPUufjiYgSqRhiFD0Q1iI4Odora5RE8Iv1D24hAz5oMophRGkGz+yuvQmmUMnMw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/eslint-import-resolver-node": {
       "version": "0.3.9",
       "resolved": "https://registry.npmjs.org/eslint-import-resolver-node/-/eslint-import-resolver-node-0.3.9.tgz",
@@ -11255,13 +11258,20 @@
       }
     },
     "node_modules/eslint-plugin-react-hooks": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-5.2.0.tgz",
-      "integrity": "sha512-+f15FfK64YQwZdJNELETdn5ibXEUQmW1DZL6KXhNnc2heoy/sg9VJJeT7n8TlMWouzWqSWavFkIhHyIbIAEapg==",
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-7.0.1.tgz",
+      "integrity": "sha512-O0d0m04evaNzEPoSW+59Mezf8Qt0InfgGIBJnpC0h3NH/WjUAR7BIKUfysC6todmtiZ/A0oUVS8Gce0WhBrHsA==",
       "dev": true,
       "license": "MIT",
+      "dependencies": {
+        "@babel/core": "^7.24.4",
+        "@babel/parser": "^7.24.4",
+        "hermes-parser": "^0.25.1",
+        "zod": "^3.25.0 || ^4.0.0",
+        "zod-validation-error": "^3.5.0 || ^4.0.0"
+      },
       "engines": {
-        "node": ">=10"
+        "node": ">=18"
       },
       "peerDependencies": {
         "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0"
@@ -12753,6 +12763,23 @@
         "he": "bin/he"
       }
     },
+    "node_modules/hermes-estree": {
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/hermes-estree/-/hermes-estree-0.25.1.tgz",
+      "integrity": "sha512-0wUoCcLp+5Ev5pDW2OriHC2MJCbwLwuRx+gAqMTOkGKJJiBCLjtrvy4PWUGn6MIVefecRpzoOZ/UV6iGdOr+Cw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/hermes-parser": {
+      "version": "0.25.1",
+      "resolved": "https://registry.npmjs.org/hermes-parser/-/hermes-parser-0.25.1.tgz",
+      "integrity": "sha512-6pEjquH3rqaI6cYAXYPcz9MS4rY6R4ngRgrgfDshRptUZIc3lw0MCIJIGDj9++mfySOuPTHB4nrSW99BCvOPIA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hermes-estree": "0.25.1"
+      }
+    },
     "node_modules/highlight.js": {
       "version": "10.7.3",
       "resolved": "https://registry.npmjs.org/highlight.js/-/highlight.js-10.7.3.tgz",
@@ -15427,9 +15454,9 @@
       }
     },
     "node_modules/micromatch/node_modules/picomatch": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
-      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
+      "integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -16041,13 +16068,14 @@
       }
     },
     "node_modules/next": {
-      "version": "15.5.14",
-      "resolved": "https://registry.npmjs.org/next/-/next-15.5.14.tgz",
-      "integrity": "sha512-M6S+4JyRjmKic2Ssm7jHUPkE6YUJ6lv4507jprsSZLulubz0ihO2E+S4zmQK3JZ2ov81JrugukKU4Tz0ivgqqQ==",
+      "version": "16.2.1",
+      "resolved": "https://registry.npmjs.org/next/-/next-16.2.1.tgz",
+      "integrity": "sha512-VaChzNL7o9rbfdt60HUj8tev4m6d7iC1igAy157526+cJlXOQu5LzsBXNT+xaJnTP/k+utSX5vMv7m0G+zKH+Q==",
       "license": "MIT",
       "dependencies": {
-        "@next/env": "15.5.14",
+        "@next/env": "16.2.1",
         "@swc/helpers": "0.5.15",
+        "baseline-browser-mapping": "^2.9.19",
         "caniuse-lite": "^1.0.30001579",
         "postcss": "8.4.31",
         "styled-jsx": "5.1.6"
@@ -16056,18 +16084,18 @@
         "next": "dist/bin/next"
       },
       "engines": {
-        "node": "^18.18.0 || ^19.8.0 || >= 20.0.0"
+        "node": ">=20.9.0"
       },
       "optionalDependencies": {
-        "@next/swc-darwin-arm64": "15.5.14",
-        "@next/swc-darwin-x64": "15.5.14",
-        "@next/swc-linux-arm64-gnu": "15.5.14",
-        "@next/swc-linux-arm64-musl": "15.5.14",
-        "@next/swc-linux-x64-gnu": "15.5.14",
-        "@next/swc-linux-x64-musl": "15.5.14",
-        "@next/swc-win32-arm64-msvc": "15.5.14",
-        "@next/swc-win32-x64-msvc": "15.5.14",
-        "sharp": "^0.34.3"
+        "@next/swc-darwin-arm64": "16.2.1",
+        "@next/swc-darwin-x64": "16.2.1",
+        "@next/swc-linux-arm64-gnu": "16.2.1",
+        "@next/swc-linux-arm64-musl": "16.2.1",
+        "@next/swc-linux-x64-gnu": "16.2.1",
+        "@next/swc-linux-x64-musl": "16.2.1",
+        "@next/swc-win32-arm64-msvc": "16.2.1",
+        "@next/swc-win32-x64-msvc": "16.2.1",
+        "sharp": "^0.34.5"
       },
       "peerDependencies": {
         "@opentelemetry/api": "^1.1.0",
@@ -19379,9 +19407,9 @@
       }
     },
     "node_modules/ts-api-utils": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
-      "integrity": "sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==",
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.5.0.tgz",
+      "integrity": "sha512-OJ/ibxhPlqrMM0UiNHJ/0CKQkoKF243/AEmplt3qpRgkW8VG7IfOS41h7V8TjITqdByHzrjcS/2si+y4lIh8NA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -20065,6 +20093,30 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/typescript-eslint": {
+      "version": "8.57.2",
+      "resolved": "https://registry.npmjs.org/typescript-eslint/-/typescript-eslint-8.57.2.tgz",
+      "integrity": "sha512-VEPQ0iPgWO/sBaZOU1xo4nuNdODVOajPnTIbog2GKYr31nIlZ0fWPoCQgGfF3ETyBl1vn63F/p50Um9Z4J8O8A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/eslint-plugin": "8.57.2",
+        "@typescript-eslint/parser": "8.57.2",
+        "@typescript-eslint/typescript-estree": "8.57.2",
+        "@typescript-eslint/utils": "8.57.2"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^8.57.0 || ^9.0.0 || ^10.0.0",
+        "typescript": ">=4.8.4 <6.0.0"
+      }
+    },
     "node_modules/unbox-primitive": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.1.0.tgz",
@@ -22283,6 +22335,19 @@
         "url": "https://github.com/sponsors/colinhacks"
       }
     },
+    "node_modules/zod-validation-error": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/zod-validation-error/-/zod-validation-error-4.0.2.tgz",
+      "integrity": "sha512-Q6/nZLe6jxuU80qb/4uJ4t5v2VEZ44lzQjPDhYJNztRQ4wyWc6VF3D3Kb/fAuPetZQnhS3hnajCf9CsWesghLQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "peerDependencies": {
+        "zod": "^3.25.0 || ^4.0.0"
+      }
+    },
     "node_modules/zwitch": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-2.0.4.tgz",
diff --git a/package.json b/package.json
index 0ad1f539..e26cec42 100644
--- a/package.json
+++ b/package.json
@@ -8,10 +8,10 @@
   ],
   "scripts": {
     "prebuild": "npm run cf-typegen && tsx ./scripts/checkDocs.ts && tsx ./scripts/generateDocsMeta.ts && tsx ./scripts/copyAllDTSFiles.ts && tsx ./scripts/removeHinting.ts",
-    "dev": "npm run prebuild && next dev",
-    "build": "next build",
+    "dev": "npm run prebuild && next dev --webpack",
+    "build": "next build --webpack",
     "start": "next start",
-    "lint": "npm run cf-typegen && next lint",
+    "lint": "npm run cf-typegen && eslint .",
     "tsc": "npm run cf-typegen && tsc",
     "format": "prettier --write app/ packages/",
     "db-migrate": "drizzle-kit migrate",
@@ -25,7 +25,7 @@
     "@fontsource-variable/inconsolata": "^5.2.7",
     "@fontsource/m-plus-rounded-1c": "^5.2.9",
     "@google/genai": "^1.21.0",
-    "@opennextjs/cloudflare": "^1.16.1",
+    "@opennextjs/cloudflare": "^1.18.0",
     "@xterm/addon-fit": "^0.11.0",
     "@xterm/xterm": "^6.1.0-beta.168",
     "ace-builds": "^1.43.2",
@@ -36,7 +36,7 @@
     "drizzle-orm": "^0.44.7",
     "js-yaml": "^4.1.1",
     "mocha": "^11.7.4",
-    "next": "^15.5.14",
+    "next": "^16.2.1",
     "pg": "^8.16.3",
     "prismjs": "^1.30.0",
     "react": "^19",
@@ -52,7 +52,6 @@
     "zod": "^4.0.17"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3",
     "@pyodide/webpack-plugin": "^1.4.0",
     "@tailwindcss/postcss": "^4",
     "@types/js-yaml": "^4.0.9",
@@ -68,7 +67,7 @@
     "daisyui": "^5.5.5",
     "drizzle-kit": "^0.31.5",
     "eslint": "^9",
-    "eslint-config-next": "^15.5.14",
+    "eslint-config-next": "^16.2.1",
     "fonteditor-core": "^2.6.3",
     "pako": "^2.1.0",
     "prettier": "^3.6.2",
diff --git a/packages/runtime/src/context.tsx b/packages/runtime/src/context.tsx
index 6351e341..a83f96bb 100644
--- a/packages/runtime/src/context.tsx
+++ b/packages/runtime/src/context.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { ReactNode, RefObject, useEffect, useRef } from "react";
+import { ReactNode, useEffect } from "react";
 import { RuntimeContext } from "./interface";
 import { RuntimeLang } from "./languages";
 import { TypeScriptProvider, useTypeScript } from "./typescript/runtime";
@@ -12,14 +12,14 @@ import { WorkerProvider } from "./worker/runtime";
 
 export function useRuntime(language: RuntimeLang): RuntimeContext {
   const runtimes = useRuntimeAll();
-  const runtime = runtimes.current[language];
+  const runtime = runtimes[language];
   const { init } = runtime;
   useEffect(() => {
     init?.();
   }, [init]);
   return runtime;
 }
-export function useRuntimeAll(): RefObject<Record<RuntimeLang, RuntimeContext>> {
+export function useRuntimeAll(): Record<RuntimeLang, RuntimeContext> {
   // すべての言語のcontextをインスタンス化
   const pyodide = usePyodide();
   const ruby = useRuby();
@@ -28,16 +28,15 @@ export function useRuntimeAll(): RefObject<Record<RuntimeLang, RuntimeContext>>
   const wandboxCpp = useWandbox("cpp");
   const wandboxRust = useWandbox("rust");
 
-  const runtimes = useRef<Record<RuntimeLang, RuntimeContext>>({} as never);
-  runtimes.current.python = pyodide;
-  runtimes.current.ruby = ruby;
-  runtimes.current.javascript = jsEval;
-  runtimes.current.typescript = typescript;
-  runtimes.current.cpp = wandboxCpp;
-  runtimes.current.rust = wandboxRust;
-
   // initはしない。呼び出し側でする必要がある
-  return runtimes;
+  return {
+    python: pyodide,
+    ruby: ruby,
+    javascript: jsEval,
+    typescript: typescript,
+    cpp: wandboxCpp,
+    rust: wandboxRust,
+  };
 }
 export function RuntimeProvider({ children }: { children: ReactNode }) {
   return (
diff --git a/packages/runtime/tests/vitest-all.tsx b/packages/runtime/tests/vitest-all.tsx
index 15fd2c49..abfcea2f 100644
--- a/packages/runtime/tests/vitest-all.tsx
+++ b/packages/runtime/tests/vitest-all.tsx
@@ -14,8 +14,9 @@ const RuntimeLoader = ({
 }: {
   runtimeRef: RefObject<Record<RuntimeLang, RuntimeContext> | null>;
 }) => {
-  const runtimes = useRuntimeAll();
-  runtimeRef.current = runtimes.current;
+  const runtimeAll = useRuntimeAll();
+  // eslint-disable-next-line react-hooks/refs
+  runtimeRef.current = runtimeAll;
   return null;
 };
 
diff --git a/tsconfig.json b/tsconfig.json
index 63c1d1e9..60d973ab 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2017",
-    "lib": ["dom", "dom.iterable", "es2023"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "es2023"
+    ],
     "allowJs": true,
     "skipLibCheck": true,
     "strict": true,
@@ -11,7 +15,7 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "incremental": true,
     "plugins": [
       {
@@ -19,11 +23,25 @@
       }
     ],
     "paths": {
-      "@/*": ["./app/*"],
-      "@my-code/runtime/tests/*": ["./packages/runtime/tests/*"],
-      "@my-code/runtime/*": ["./packages/runtime/src/*"]
+      "@/*": [
+        "./app/*"
+      ],
+      "@my-code/runtime/tests/*": [
+        "./packages/runtime/tests/*"
+      ],
+      "@my-code/runtime/*": [
+        "./packages/runtime/src/*"
+      ]
     }
   },
-  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
-  "exclude": ["node_modules"]
+  "include": [
+    "next-env.d.ts",
+    "**/*.ts",
+    "**/*.tsx",
+    ".next/types/**/*.ts",
+    ".next/dev/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
+  ]
 }