sveltejs · manuel3108 · Feb 6, 2026 · Feb 6, 2026 · Feb 6, 2026 · Feb 8, 2026
diff --git a/packages/migrate/package.json b/packages/migrate/package.json
@@ -43,7 +43,7 @@
 		"@types/node": "^20.14.8",
 		"@types/prompts": "^2.4.9",
 		"@types/semver": "^7.7.1",
-		"svelte": "^5.45.10"
+		"svelte": "^5.48.0"
 	},
 	"keywords": [
 		"migration",

diff --git a/packages/sv/lib/cli/tests/snapshots/create-with-all-addons/src/app.html b/packages/sv/lib/cli/tests/snapshots/create-with-all-addons/src/app.html
@@ -12,7 +12,5 @@
 		%sveltekit.head%
 	</head>
 
-	<body data-sveltekit-preload-data="hover">
-		<div style="display: contents">%sveltekit.body%</div>
-	</body>
+	<body data-sveltekit-preload-data="hover"><div style="display: contents">%sveltekit.body%</div></body>
 </html>
diff --git a/packages/sv/lib/core/tests/svelte/common/ensure-script/output.svelte b/packages/sv/lib/core/tests/svelte/common/ensure-script/output.svelte
@@ -1,5 +1,3 @@
 <script></script>
 
-<div>
-	<p>This is a Svelte component without script block</p>
-</div>
+<div><p>This is a Svelte component without script block</p></div>
diff --git a/packages/sv/lib/core/tooling/css/index.ts b/packages/sv/lib/core/tooling/css/index.ts
@@ -1,7 +1,7 @@
 import type { SvelteAst } from '../index.ts';
 
 export function addRule(
-	node: SvelteAst.CSS.StyleSheet,
+	node: SvelteAst.CSS.StyleSheetRules,
 	options: { selector: string }
 ): SvelteAst.CSS.Rule {
 	// we do not check for existing rules here, as the selector AST from svelte is really complex
@@ -73,7 +73,10 @@ export function addDeclaration(
 	}
 }
 
-export function addImports(node: SvelteAst.CSS.StyleSheet, options: { imports: string[] }): void {
+export function addImports(
+	node: SvelteAst.CSS.StyleSheetRules,
+	options: { imports: string[] }
+): void {
 	let lastImportIndex = -1;
 
 	// Find the last existing @import to insert after it
@@ -113,7 +116,7 @@ export function addImports(node: SvelteAst.CSS.StyleSheet, options: { imports: s
 }
 
 export function addAtRule(
-	node: SvelteAst.CSS.StyleSheet,
+	node: SvelteAst.CSS.StyleSheetRules,
 	options: { name: string; params: string; append: boolean }
 ): SvelteAst.CSS.Atrule {
 	const atRules = node.children.filter((x) => x.type === 'Atrule');

diff --git a/packages/sv/lib/core/tooling/index.ts b/packages/sv/lib/core/tooling/index.ts
@@ -2,7 +2,12 @@ import { print as esrapPrint } from 'esrap';
 import ts from 'esrap/languages/ts';
 import type { BaseNode } from 'estree';
 import * as fleece from 'silver-fleece';
-import { type AST as SvelteAst, parse as svelteParse, print as sveltePrint } from 'svelte/compiler';
+import {
+	type AST as SvelteAst,
+	parse as svelteParse,
+	print as sveltePrint,
+	parseCss as svelteParseCss
+} from 'svelte/compiler';
 import * as yaml from 'yaml';
 import * as toml from 'smol-toml';
 import { ensureScript } from './svelte/index.ts';
@@ -62,12 +67,11 @@ export function serializeScript(
 	return code;
 }
 
-export function parseCss(content: string): SvelteAst.CSS.StyleSheet {
-	const ast = parseSvelte(`<style>${content}</style>`);
-	return ast.css!;
+export function parseCss(content: string): SvelteAst.CSS.StyleSheetRules {
+	return svelteParseCss(content);
 }
 
-export function serializeCss(ast: SvelteAst.CSS.StyleSheet): string {
+export function serializeCss(ast: SvelteAst.CSS.StyleSheetRules): string {
 	// `svelte` can print the stylesheet directly. But this adds the style tags (<style>) that we do not want here.
 	// `svelte` is unable to print an array of rules (ast.children) directly, therefore we concatenate the printed rules manually.
 

diff --git a/packages/sv/lib/core/tooling/parsers.ts b/packages/sv/lib/core/tooling/parsers.ts
@@ -28,7 +28,9 @@ export function parseScript(source: string): {
 	return { ast, comments, source, generateCode };
 }
 
-export function parseCss(source: string): { ast: utils.SvelteAst.CSS.StyleSheet } & ParseBase {
+export function parseCss(
+	source: string
+): { ast: Omit<utils.SvelteAst.CSS.StyleSheet, 'attributes' | 'content'> } & ParseBase {
 	const ast = utils.parseCss(source);
 	const generateCode = () => utils.serializeCss(ast);
 

diff --git a/packages/sv/lib/create/templates/demo/package.json b/packages/sv/lib/create/templates/demo/package.json
@@ -14,7 +14,7 @@
 		"@sveltejs/adapter-auto": "^4.0.0",
 		"@sveltejs/kit": "^2.22.0",
 		"@sveltejs/vite-plugin-svelte": "^6.0.0",
-		"svelte": "^5.25.0",
+		"svelte": "^5.48.0",
 		"typescript": "^5.3.3",
 		"vite": "^7.0.4"
 	}

diff --git a/packages/sv/package.json b/packages/sv/package.json
@@ -52,7 +52,7 @@
 		"silver-fleece": "^1.2.1",
 		"smol-toml": "^1.5.2",
 		"sucrase": "^3.35.1",
-		"svelte": "^5.47.1",
+		"svelte": "https://pkg.pr.new/svelte@17654",
 		"tar-fs": "^3.1.1",
 		"tiny-glob": "^0.2.9",
 		"tinyexec": "^1.0.2",

diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml