diff --git a/astro.config.mjs b/astro.config.mjs
index c25386b..b3a15d8 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -6,15 +6,17 @@ import partytown from '@astrojs/partytown'
 import remarkMath from 'remark-math'
 import rehypeKatex from 'rehype-katex'
 import mdx from '@astrojs/mdx'
+import { SITE } from './src/config.mjs'
+import { getSitemapOptions } from './src/sitemap.mjs'
 
 export default defineConfig({
-	site: 'https://4byte.dev',
+	site: SITE.origin,
 	output: 'static',
 	integrations: [
 		UnoCSS(),
 		mdx(),
 		icon(),
-		sitemap(),
+		sitemap(getSitemapOptions()),
 		partytown({
 			config: {
 				forward: ['dataLayer.push'],
diff --git a/src/sitemap.mjs b/src/sitemap.mjs
new file mode 100644
index 0000000..db58153
--- /dev/null
+++ b/src/sitemap.mjs
@@ -0,0 +1,94 @@
+import { readFileSync, readdirSync } from 'fs'
+import { fileURLToPath } from 'url'
+import { dirname, join } from 'path'
+import { SITE, LANGUAGES, DEFAULT_LANG, SUPPORTED_LANGS } from './config.mjs'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = dirname(__filename)
+
+function getArticleDates() {
+	const dates = {}
+	for (const lang of SUPPORTED_LANGS) {
+		const dir = join(__dirname, 'content/articles', lang)
+		try {
+			const files = readdirSync(dir).filter((f) => f.endsWith('.mdx'))
+			for (const file of files) {
+				const content = readFileSync(join(dir, file), 'utf-8')
+				const match = content.match(/^---\n([\s\S]*?)\n---/)
+				if (match) {
+					const frontmatter = match[1]
+					const slugMatch = frontmatter.match(/slug:\s*['"](.+?)['"]/)
+					const dateMatch = frontmatter.match(/date:\s*['"](.+?)['"]/)
+					if (slugMatch && dateMatch) {
+						dates[slugMatch[1]] = dateMatch[1]
+					}
+				}
+			}
+		} catch {
+			// directory doesn't exist or is empty
+		}
+	}
+	return dates
+}
+
+function getCustomPages() {
+	const pages = []
+	for (const lang of SUPPORTED_LANGS) {
+		const prefix = LANGUAGES[lang].prefix
+		try {
+			const categories = JSON.parse(readFileSync(join(__dirname, `data/${lang}/categories.json`), 'utf-8'))
+			for (const c of categories) {
+				pages.push(`${SITE.origin}${prefix}/categories/${c.slug}/`)
+			}
+		} catch {
+			// file doesn't exist or is empty
+		}
+		try {
+			const tags = JSON.parse(readFileSync(join(__dirname, `data/${lang}/tags.json`), 'utf-8'))
+			for (const t of tags) {
+				pages.push(`${SITE.origin}${prefix}/tags/${t.slug}/`)
+			}
+		} catch {
+			// file doesn't exist or is empty
+		}
+	}
+	return pages
+}
+
+const articleDates = getArticleDates()
+const customPages = getCustomPages()
+
+const i18n = {
+	defaultLocale: DEFAULT_LANG,
+	locales: Object.fromEntries(SUPPORTED_LANGS.map((lang) => [lang, LANGUAGES[lang].ogLocale.replace('_', '-')])),
+}
+
+export function getSitemapOptions() {
+	return {
+		filter: (page) => !page.includes('/404'),
+		i18n,
+		customPages,
+		serialize: (item) => {
+			const articleMatch = item.url.match(/\/articles\/([^/]+)\//)
+			if (articleMatch) {
+				const slug = articleMatch[1]
+				if (articleDates[slug]) {
+					item.lastmod = articleDates[slug]
+				}
+				item.changefreq = 'weekly'
+				item.priority = 0.8
+				return item
+			}
+
+			if (/\/(categories|tags)\/[^/]+\/$/.test(item.url)) {
+				item.changefreq = 'monthly'
+				item.priority = 0.6
+				return item
+			}
+
+			item.changefreq = 'weekly'
+			item.priority = 0.5
+			return item
+		},
+	}
+}