diff --git a/build/prepare.js b/build/prepare.js
index 4cefc8878..5c5ca56a8 100644
--- a/build/prepare.js
+++ b/build/prepare.js
@@ -13,10 +13,11 @@ const withoutTypes = (data) => ({
     compilerOptions: Object.fromEntries(Object.entries(data.compilerOptions).filter(([k]) => k !== 'types')),
 });
 
-/** @type {import('typescript/lib/typescript').CompilerOptions} */
+/** @type {import('typescript').CompilerOptions} */
 const compilerOptionsBase = {
     target: 'es2022',
-    lib: ['esnext'],
+    lib: ['esnext', 'DOM'],
+    types: ['node'],
     module: 'preserve',
     esModuleInterop: true,
     moduleResolution: 'bundler',
@@ -103,9 +104,9 @@ const UIConfig = {
         module: 'ESNext',
         skipLibCheck: true,
         allowSyntheticDefaultImports: true,
-        baseUrl: '.',
         jsx: 'react-jsx',
         outDir: path.join(baseOutDir, 'ui'),
+        types: ['node', 'webpack-env'],
 
         useDefineForClassFields: true,
         lib: ['esnext', 'DOM', 'DOM.Iterable'],
@@ -187,7 +188,6 @@ const pluginsConfig = {
     compilerOptions: {
         ...compilerOptionsBase,
         rootDir: '.',
-        baseUrl: '.',
         outDir: path.join(baseOutDir, 'plugins'),
         skipLibCheck: true,
         paths: {
diff --git a/framework/eslint-config/package.json b/framework/eslint-config/package.json
index 7d6901c33..2af4ab83a 100644
--- a/framework/eslint-config/package.json
+++ b/framework/eslint-config/package.json
@@ -20,6 +20,6 @@
         "eslint": ">= 9"
     },
     "optionalDependencies": {
-        "typescript": "^5.9.3"
+        "typescript": "6.0.3"
     }
 }
diff --git a/package.json b/package.json
index 1dc0248b0..564b0fb4f 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
         "@types/autocannon": "^7.12.7",
         "@types/chai": "^5.2.3",
         "@types/cross-spawn": "^6.0.6",
-        "@types/node": "24.10.13",
+        "@types/node": "24.13.3",
         "@types/semver": "^7.8.0",
         "autocannon": "^8.0.0",
         "cac": "^7.0.0",
@@ -61,7 +61,7 @@
         "simple-git": "^3.36.0",
         "supertest": "^7.2.2",
         "supports-hyperlinks": "^4.5.0",
-        "typescript": "5.8.3",
+        "typescript": "6.0.3",
         "wtfnode": "^0.10.1"
     },
     "resolutions": {
diff --git a/packages/ui-default/backendlib/markdown-it-media.ts b/packages/ui-default/backendlib/markdown-it-media.ts
index b543624bc..1d160f858 100644
--- a/packages/ui-default/backendlib/markdown-it-media.ts
+++ b/packages/ui-default/backendlib/markdown-it-media.ts
@@ -3,7 +3,7 @@
 /* eslint-disable regexp/no-useless-non-capturing-group */
 /* eslint-disable regexp/optimal-quantifier-concatenation */
 
-import type MarkdownIt from 'markdown-it';
+import type { MarkdownIt } from 'markdown-it';
 import { v4 as uuid } from 'uuid';
 
 const allowFullScreen = ' webkitallowfullscreen mozallowfullscreen allowfullscreen';
@@ -103,8 +103,8 @@ declare module 'hydrooj' {
 export function Media(md: MarkdownIt, { pdfToolbar = false }: { pdfToolbar?: boolean } = {}) {
   const supported = ['youtube', 'vimeo', 'vine', 'prezi', 'bilibili', 'youku', 'msoffice'];
   md.renderer.rules.video = function tokenizeReturn(tokens, idx) {
-    const src = tokens[idx].attrGet('src');
-    const service = tokens[idx].attrGet('service').replace(/[^A-Z0-9]/gi, '').toLowerCase();
+    const src = (tokens[idx].attrGet('src') ?? '').toString();
+    const service = (tokens[idx].attrGet('service') ?? '').toString().replace(/[^A-Z0-9]/gi, '').toLowerCase();
     if (Hydro?.module?.richmedia?.[service]) {
       const result = Hydro?.module?.richmedia[service].get(service, src, md);
       if (result) return result;
@@ -138,7 +138,7 @@ export function Media(md: MarkdownIt, { pdfToolbar = false }: { pdfToolbar?: boo
       return `\
       <iframe class="embed-responsive-item ${service}-player" type="text/html" \
         width="100%" style="min-height: 500px" ${allowFullScreen} \
-        src="${md.utils.escapeHtml(resourceUrl(service, src, tokens[idx].attrGet('url')))}"
+        src="${md.utils.escapeHtml(resourceUrl(service, src, (tokens[idx].attrGet('url') ?? '').toString()))}"
         scrolling="no" border="0" frameborder="no" framespacing="0"></iframe>`;
     }
     return `<div data-${service}>${md.utils.escapeHtml(src)}</div>`;
diff --git a/packages/ui-default/pages/problem_detail.page.tsx b/packages/ui-default/pages/problem_detail.page.tsx
index 2bea3a643..00507ec11 100644
--- a/packages/ui-default/pages/problem_detail.page.tsx
+++ b/packages/ui-default/pages/problem_detail.page.tsx
@@ -119,7 +119,8 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
       // @ts-ignore
       .transition(
         { opacity: 1 },
-        { duration: 200, easing: 'easeOutCubic' },
+        200,
+        'easeOutCubic',
       )
       .promise();
   }
@@ -129,7 +130,8 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
       // @ts-ignore
       .transition(
         { opacity: 0 },
-        { duration: 200, easing: 'easeOutCubic' },
+        200,
+        'easeOutCubic',
       )
       .promise();
   }
diff --git a/packages/vjudge/src/proxy.ts b/packages/vjudge/src/proxy.ts
index c873d1fd0..0dcc8332b 100644
--- a/packages/vjudge/src/proxy.ts
+++ b/packages/vjudge/src/proxy.ts
@@ -1,6 +1,6 @@
 declare module 'superagent' {
     interface Request {
-        proxy: (url: string) => this;
+        proxy(url: string): this;
     }
 }
 export default {};