diff --git a/src/adapters/sveltekit.templates.ts b/src/adapters/sveltekit.templates.ts
index 99b229a7..77cc8493 100644
--- a/src/adapters/sveltekit.templates.ts
+++ b/src/adapters/sveltekit.templates.ts
@@ -67,20 +67,8 @@ export function prismicIOFileTemplate({ typescript }: { typescript: boolean }):
 	`;
 }
 
-export function sliceSimulatorPageTemplate({ version }: { version: number }): string {
-	const v5 = dedent`
-		<script>
-			import { SliceSimulator, SliceZone } from '@prismicio/svelte';
-			import { components } from '$lib/slices';
-		</script>
-
-		<!-- Slot syntax is used for backward compatibility with Svelte <=4. -->
-		<SliceSimulator let:slices>
-			<SliceZone {slices} {components} />
-		</SliceSimulator>
-	`;
-
-	const v4 = dedent`
+export function sliceSimulatorPageTemplate(): string {
+	return dedent`
 		<script>
 			import { SliceSimulator, SliceZone } from '@prismicio/svelte';
 			import { components } from '$lib/slices';
@@ -90,8 +78,6 @@ export function sliceSimulatorPageTemplate({ version }: { version: number }): st
 			<SliceZone {slices} {components} />
 		</SliceSimulator>
 	`;
-
-	return version <= 4 ? v4 : v5;
 }
 
 export function previewAPIRouteTemplate({ typescript }: { typescript: boolean }): string {
@@ -122,20 +108,6 @@ export function previewAPIRouteTemplate({ typescript }: { typescript: boolean })
 	`;
 }
 
-const HEAD_MARKUP = dedent`
-	<svelte:head>
-		<title>{page.data.page?.data.meta_title}</title>
-		<meta property="og:title" content={page.data.page?.data.meta_title} />
-		{#if isFilled.keyText(page.data.page?.data.meta_description)}
-			<meta name="description" content={page.data.page.data.meta_description} />
-			<meta property="og:description" content={page.data.page.data.meta_description} />
-		{/if}
-		{#if isFilled.image(page.data.page?.data.meta_image)}
-			<meta property="og:image" content={asImageSrc(page.data.page.data.meta_image)} />
-		{/if}
-	</svelte:head>
-`;
-
 export function layoutServerTemplate(): string {
 	return dedent`
 		import { repositoryName } from "$lib/prismicio";
@@ -148,8 +120,8 @@ export function layoutServerTemplate(): string {
 	`;
 }
 
-export function rootLayoutTemplate({ version }: { version: number }): string {
-	const v5 = dedent`
+export function rootLayoutTemplate(): string {
+	return dedent`
 		<script>
 			import { isFilled, asImageSrc } from '@prismicio/client';
 			import { PrismicPreview } from '@prismicio/svelte/kit';
@@ -158,26 +130,20 @@ export function rootLayoutTemplate({ version }: { version: number }): string {
 			const { data, children } = $props();
 		</script>
 
-		${HEAD_MARKUP}
+		<svelte:head>
+			<title>{page.data.page?.data.meta_title}</title>
+			<meta property="og:title" content={page.data.page?.data.meta_title} />
+			{#if isFilled.keyText(page.data.page?.data.meta_description)}
+				<meta name="description" content={page.data.page.data.meta_description} />
+				<meta property="og:description" content={page.data.page.data.meta_description} />
+			{/if}
+			{#if isFilled.image(page.data.page?.data.meta_image)}
+				<meta property="og:image" content={asImageSrc(page.data.page.data.meta_image)} />
+			{/if}
+		</svelte:head>
 		{@render children()}
 		<PrismicPreview repositoryName={data.repositoryName} />
 	`;
-
-	const v4 = dedent`
-		<script>
-			import { isFilled, asImageSrc } from '@prismicio/client';
-			import { PrismicPreview } from '@prismicio/svelte/kit';
-			import { page } from '$app/state';
-
-			export let data;
-		</script>
-
-		${HEAD_MARKUP}
-		<slot />
-		<PrismicPreview repositoryName={data.repositoryName} />
-	`;
-
-	return version <= 4 ? v4 : v5;
 }
 
 export function pageTemplate({ typescript }: { typescript: boolean }): string {
@@ -277,31 +243,25 @@ const SLICE_MARKUP = dedent`
 </section>
 `;
 
-export function sliceTemplate({
-	name,
-	typescript,
-	version,
-}: {
-	name: string;
-	typescript: boolean;
-	version: number;
-}): string {
+export function sliceTemplate({ name, typescript }: { name: string; typescript: boolean }): string {
 	const pascalName = pascalCase(name);
 
-	const v5TS = dedent`
-		<script lang="ts">
-			import type { Content } from '@prismicio/client';
-			import type { SliceComponentProps } from '@prismicio/svelte';
+	if (typescript) {
+		return dedent`
+			<script lang="ts">
+				import type { Content } from '@prismicio/client';
+				import type { SliceComponentProps } from '@prismicio/svelte';
 
-			type Props = SliceComponentProps<Content.${pascalName}Slice>;
+				type Props = SliceComponentProps<Content.${pascalName}Slice>;
 
-			const { slice }: Props = $props();
-		</script>
+				const { slice }: Props = $props();
+			</script>
 
-		${SLICE_MARKUP}
-	`;
+			${SLICE_MARKUP}
+		`;
+	}
 
-	const v5JS = dedent`
+	return dedent`
 		<script>
 			/* @typedef {import("@prismicio/client").Content} Content */
 			/* @typedef {import("@prismicio/svelte").SliceComponentProps} SliceComponentProps */
@@ -312,29 +272,4 @@ export function sliceTemplate({
 
 		${SLICE_MARKUP}
 	`;
-
-	const v4TS = dedent`
-		<script lang="ts">
-			import type { Content } from '@prismicio/client';
-
-			export let slice: Content.${pascalName}Slice;
-		</script>
-
-		${SLICE_MARKUP}
-	`;
-
-	const v4JS = dedent`
-		<script>
-			/** @type {import("@prismicio/client").Content.${pascalName}Slice} */
-			export let slice;
-		</script>
-
-		${SLICE_MARKUP}
-	`;
-
-	if (typescript) {
-		return version <= 4 ? v4TS : v5TS;
-	}
-
-	return version <= 4 ? v4JS : v5JS;
 }
diff --git a/src/adapters/sveltekit.ts b/src/adapters/sveltekit.ts
index d43d5d6b..d05f3dc5 100644
--- a/src/adapters/sveltekit.ts
+++ b/src/adapters/sveltekit.ts
@@ -8,7 +8,6 @@ import { pascalCase } from "change-case";
 import {
 	Adapter,
 	checkSourceContains,
-	getInstalledMajor,
 	getJsFileExtension,
 	type PageFile,
 	writeFileIfMissing,
@@ -54,7 +53,6 @@ export class SvelteKitAdapter extends Adapter {
 		const projectRoot = await findProjectRoot();
 		const extension = await getJsFileExtension();
 		const typescript = await checkIsTypeScriptProject();
-		const version = await getInstalledMajor("svelte");
 
 		await writeFileIfMissing(
 			new URL(`src/lib/prismicio.${extension}`, projectRoot),
@@ -62,7 +60,7 @@ export class SvelteKitAdapter extends Adapter {
 		);
 		await writeFileIfMissing(
 			new URL("src/routes/slice-simulator/+page.svelte", projectRoot),
-			sliceSimulatorPageTemplate({ version }),
+			sliceSimulatorPageTemplate(),
 		);
 		await writeFileIfMissing(
 			new URL(`src/params/preview.${extension}`, projectRoot),
@@ -104,7 +102,7 @@ export class SvelteKitAdapter extends Adapter {
 		if (returnsRepositoryName) {
 			await writeFileIfMissing(
 				new URL("src/routes/+layout.svelte", projectRoot),
-				rootLayoutTemplate({ version }),
+				rootLayoutTemplate(),
 			);
 		}
 		await deleteStarterHomePage();
@@ -132,34 +130,6 @@ export class SvelteKitAdapter extends Adapter {
 	private async getPreviewStep(): Promise<string | undefined> {
 		if (await checkSourceContains("PrismicPreview")) return;
 
-		const layoutStep =
-			(await getInstalledMajor("svelte")) <= 4
-				? dedent`
-					Add the lines marked + to src/routes/+layout.svelte:
-
-					  <script>
-					+   import { PrismicPreview } from "@prismicio/svelte/kit";
-					+
-					+   export let data;
-					  </script>
-
-					  <slot />
-					+ <PrismicPreview repositoryName={data.repositoryName} />
-				`
-				: dedent`
-					Change the lines marked - and + in src/routes/+layout.svelte:
-
-					  <script>
-					+   import { PrismicPreview } from "@prismicio/svelte/kit";
-
-					-   let { children } = $props();
-					+   let { data, children } = $props();
-					  </script>
-
-					  {@render children()}
-					+ <PrismicPreview repositoryName={data.repositoryName} />
-				`;
-
 		// The layout reads repositoryName from the server layout's data.
 		const serverLayoutPath =
 			(await findServerLayout()) ?? `src/routes/+layout.server.${await getJsFileExtension()}`;
@@ -177,8 +147,19 @@ export class SvelteKitAdapter extends Adapter {
 
 				Previews do not work until you do this, and the CLI cannot edit your
 				layout for you. Make the change now.
+
+				Change the lines marked - and + in src/routes/+layout.svelte:
+
+				  <script>
+				+   import { PrismicPreview } from "@prismicio/svelte/kit";
+
+				-   let { children } = $props();
+				+   let { data, children } = $props();
+				  </script>
+
+				  {@render children()}
+				+ <PrismicPreview repositoryName={data.repositoryName} />
 			`,
-			layoutStep,
 			serverLayoutStep,
 			"Run `prismic docs view sveltekit` for details.",
 		]
@@ -215,7 +196,6 @@ export class SvelteKitAdapter extends Adapter {
 		const contents = sliceTemplate({
 			name: model.name,
 			typescript: await checkIsTypeScriptProject(),
-			version: await getInstalledMajor("svelte"),
 		});
 		await writeFileRecursive(new URL("index.svelte", directory), contents);
 	}
diff --git a/test/gen-setup.test.ts b/test/gen-setup.test.ts
index 17cfa028..2594b30c 100644
--- a/test/gen-setup.test.ts
+++ b/test/gen-setup.test.ts
@@ -40,17 +40,8 @@ it(
 	"generates valid script tags for SvelteKit",
 	{ timeout: 30_000 },
 	async ({ expect, project, prismic }) => {
-		// Reconfigure the fixture as a SvelteKit project so a file with a <script>
-		// block is generated (the simulator page).
-		await writeFile(
-			new URL("package.json", project),
-			JSON.stringify({ dependencies: { "@sveltejs/kit": "latest", svelte: "latest" } }),
-		);
-		await mkdir(new URL("node_modules/svelte/", project), { recursive: true });
-		await writeFile(
-			new URL("node_modules/svelte/package.json", project),
-			JSON.stringify({ version: "5.0.0" }),
-		);
+		// A SvelteKit project generates a file with a <script> block (the simulator page).
+		await useSvelteKit(project);
 
 		const { stderr, exitCode } = await prismic("gen", ["setup", "--no-install"]);
 		expect(exitCode, stderr).toBe(0);
@@ -179,21 +170,6 @@ it(
 	},
 );
 
-it(
-	"passes the repository name to a Svelte 4 layout it generated itself",
-	{ timeout: 30_000 },
-	async ({ expect, project, prismic }) => {
-		await useSvelteKit(project, "4.2.19");
-
-		const { stderr, exitCode } = await prismic("gen", ["setup", "--no-install"]);
-		expect(exitCode, stderr).toBe(0);
-		const layout = await readFile(new URL("src/routes/+layout.svelte", project), "utf8");
-		expect(layout).toContain("export let data;");
-		expect(layout).toContain("<PrismicPreview repositoryName={data.repositoryName} />");
-		expect(layout).not.toContain("$lib/prismicio");
-	},
-);
-
 it(
 	"returns the repository name from a SvelteKit server layout",
 	{ timeout: 30_000 },
@@ -313,41 +289,6 @@ it("works when Next.js is declared but not installed", async ({ expect, project,
 	await expect(project).toHaveFile("app/api/revalidate/route.js");
 });
 
-it(
-	"works when Svelte is declared but not installed",
-	{ timeout: 30_000 },
-	async ({ expect, project, prismic }) => {
-		// node_modules is absent, so the Svelte version cannot be read.
-		await writeFile(
-			new URL("package.json", project),
-			JSON.stringify({ dependencies: { "@sveltejs/kit": "latest", svelte: "latest" } }),
-		);
-		await mkdir(new URL("src/routes/", project), { recursive: true });
-		await writeFile(new URL("src/routes/+layout.svelte", project), "{@render children()}");
-
-		const { stdout, stderr, exitCode } = await prismic("gen", ["setup", "--no-install"]);
-		expect(exitCode, stderr).toBe(0);
-		expect(stdout).toContain("add <PrismicPreview> to your root layout");
-	},
-);
-
-it(
-	"prints Svelte 4 syntax in the instructions for a Svelte 4 project",
-	{ timeout: 30_000 },
-	async ({ expect, project, prismic }) => {
-		await useSvelteKit(project, "4.2.19");
-		await mkdir(new URL("src/routes/", project), { recursive: true });
-		await writeFile(new URL("src/routes/+layout.svelte", project), "<slot />");
-
-		const { stdout, stderr, exitCode } = await prismic("gen", ["setup", "--no-install"]);
-		expect(exitCode, stderr).toBe(0);
-		expect(stdout).toContain("+   export let data;");
-		expect(stdout).toContain("<slot />");
-		expect(stdout).not.toContain("{@render children()}");
-		expect(stdout).not.toContain("$props()");
-	},
-);
-
 it(
 	"prints SvelteKit instructions when the project already has a root layout",
 	{ timeout: 30_000 },
diff --git a/test/it.ts b/test/it.ts
index aa6480c5..31918bbc 100644
--- a/test/it.ts
+++ b/test/it.ts
@@ -196,18 +196,13 @@ export const it = test.extend<Fixtures>({
 	},
 });
 
-export async function useSvelteKit(project: URL, version = "5.0.0"): Promise<void> {
+export async function useSvelteKit(project: URL): Promise<void> {
 	await rm(new URL("node_modules/next/", project), { recursive: true, force: true });
 	await rm(new URL("app/", project), { recursive: true, force: true });
 	await writeFile(
 		new URL("package.json", project),
 		JSON.stringify({ dependencies: { "@sveltejs/kit": "latest", svelte: "latest" } }),
 	);
-	await mkdir(new URL("node_modules/svelte/", project), { recursive: true });
-	await writeFile(
-		new URL("node_modules/svelte/package.json", project),
-		JSON.stringify({ version }),
-	);
 }
 
 // Makes the package manager install fail by shadowing npm in node_modules/.bin.