diff --git a/src/routes/api/v1/posts/+server.ts b/src/routes/api/v1/posts/+server.ts
index 72d75fb..fdd97a8 100644
--- a/src/routes/api/v1/posts/+server.ts
+++ b/src/routes/api/v1/posts/+server.ts
@@ -12,9 +12,10 @@ export const GET: RequestHandler = async ({ platform, url }) => {
 		const { results } = await db
 			.prepare(
 				`
-				SELECT p.id, p.slug, p.title, p.published_at, p.updated_at, c.slug as category_slug, c.name as category_name 
+				SELECT p.id, p.slug, p.title, p.published_at, p.updated_at, c.slug as category_slug, c.name as category_name, s.slug as series_slug, s.name as series_name
 				FROM posts p
 				LEFT JOIN categories c ON p.category_id = c.id
+				LEFT JOIN series s ON p.series_id = s.id
 				ORDER BY p.published_at DESC
 				LIMIT ? OFFSET ?
 			`
@@ -45,11 +46,12 @@ export const POST: RequestHandler = async ({ request, platform }) => {
 
 	try {
 		const data = (await request.json()) as Record<string, unknown>;
-		const { slug, title, content, category_slug, tags } = data as {
+		const { slug, title, content, category_slug, series_slug, tags } = data as {
 			slug?: string;
 			title?: string;
 			content?: string;
 			category_slug?: string;
+			series_slug?: string;
 			tags?: string[];
 		};
 
@@ -69,14 +71,23 @@ export const POST: RequestHandler = async ({ request, platform }) => {
 			if (catResult) categoryId = catResult.id;
 		}
 
+		let seriesId = null;
+		if (series_slug) {
+			const seriesResult = await db
+				.prepare('SELECT id FROM series WHERE slug = ?')
+				.bind(series_slug)
+				.first<{ id: number }>();
+			if (seriesResult) seriesId = seriesResult.id;
+		}
+
 		const result = await db
 			.prepare(
 				`
-			INSERT INTO posts (slug, title, content, author_id, category_id, published_at, updated_at)
-			VALUES (?, ?, ?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
+			INSERT INTO posts (slug, title, content, author_id, category_id, series_id, published_at, updated_at)
+			VALUES (?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
 		`
 			)
-			.bind(slug, title, content, authorId, categoryId)
+			.bind(slug, title, content, authorId, categoryId, seriesId)
 			.run();
 
 		if (result.success) {
diff --git a/src/routes/api/v1/posts/[slug]/+server.ts b/src/routes/api/v1/posts/[slug]/+server.ts
index bf53d12..160686c 100644
--- a/src/routes/api/v1/posts/[slug]/+server.ts
+++ b/src/routes/api/v1/posts/[slug]/+server.ts
@@ -11,9 +11,10 @@ export const GET: RequestHandler = async ({ params, platform }) => {
 		const post = await db
 			.prepare(
 				`
-				SELECT p.id, p.slug, p.title, p.content, p.published_at, p.updated_at, c.slug as category_slug, c.name as category_name
+				SELECT p.id, p.slug, p.title, p.content, p.published_at, p.updated_at, c.slug as category_slug, c.name as category_name, s.slug as series_slug, s.name as series_name
 				FROM posts p
 				LEFT JOIN categories c ON p.category_id = c.id
+				LEFT JOIN series s ON p.series_id = s.id
 				WHERE p.slug = ?
 			`
 			)
@@ -53,14 +54,21 @@ export const PUT: RequestHandler = async ({ params, request, platform }) => {
 
 	try {
 		const data = (await request.json()) as Record<string, unknown>;
-		const { title, content, category_slug, tags } = data as {
+		const { title, content, category_slug, series_slug, tags } = data as {
 			title?: string;
 			content?: string;
 			category_slug?: string;
+			series_slug?: string;
 			tags?: string[];
 		};
 
-		if (!title && !content && category_slug === undefined && tags === undefined) {
+		if (
+			!title &&
+			!content &&
+			category_slug === undefined &&
+			series_slug === undefined &&
+			tags === undefined
+		) {
 			return json({ error: 'No fields to update' }, { status: 400 });
 		}
 
@@ -96,6 +104,18 @@ export const PUT: RequestHandler = async ({ params, request, platform }) => {
 			updates.push('category_id = ?');
 			bindings.push(categoryId);
 		}
+		if (series_slug !== undefined) {
+			let seriesId = null;
+			if (series_slug) {
+				const seriesResult = await db
+					.prepare('SELECT id FROM series WHERE slug = ?')
+					.bind(series_slug)
+					.first<{ id: number }>();
+				if (seriesResult) seriesId = seriesResult.id;
+			}
+			updates.push('series_id = ?');
+			bindings.push(seriesId);
+		}
 
 		updates.push('updated_at = CURRENT_TIMESTAMP');
 		bindings.push(slug); // for WHERE clause