diff --git a/packages/@tailwindcss-cli/package.json b/packages/@tailwindcss-cli/package.json
index 0efa4c16d494..0f45742bfa60 100644
--- a/packages/@tailwindcss-cli/package.json
+++ b/packages/@tailwindcss-cli/package.json
@@ -30,8 +30,8 @@
   },
   "dependencies": {
     "@parcel/watcher": "^2.4.1",
-    "@tailwindcss/optimize": "workspace:^",
     "@tailwindcss/oxide": "workspace:^",
+    "lightningcss": "^1.24.0",
     "mri": "^1.2.0",
     "picocolors": "^1.0.0",
     "postcss": "8.4.24",
diff --git a/packages/@tailwindcss-cli/src/commands/build/index.ts b/packages/@tailwindcss-cli/src/commands/build/index.ts
index d0c89719b57f..f739dd7fa836 100644
--- a/packages/@tailwindcss-cli/src/commands/build/index.ts
+++ b/packages/@tailwindcss-cli/src/commands/build/index.ts
@@ -1,6 +1,6 @@
 import watcher from '@parcel/watcher'
-import { optimizeCss } from '@tailwindcss/optimize'
 import { IO, Parsing, scanDir, scanFiles, type ChangedContent } from '@tailwindcss/oxide'
+import { Features, transform } from 'lightningcss'
 import { existsSync } from 'node:fs'
 import fs from 'node:fs/promises'
 import path from 'node:path'
@@ -254,3 +254,27 @@ function handleImports(
       ),
     ])
 }
+
+function optimizeCss(
+  input: string,
+  { file = 'input.css', minify = false }: { file?: string; minify?: boolean } = {},
+) {
+  return transform({
+    filename: file,
+    code: Buffer.from(input),
+    minify,
+    sourceMap: false,
+    drafts: {
+      customMedia: true,
+    },
+    nonStandard: {
+      deepSelectorCombinator: true,
+    },
+    include: Features.Nesting,
+    exclude: Features.LogicalProperties,
+    targets: {
+      safari: (16 << 16) | (4 << 8),
+    },
+    errorRecovery: true,
+  }).code.toString()
+}
diff --git a/packages/@tailwindcss-optimize/README.md b/packages/@tailwindcss-optimize/README.md
deleted file mode 100644
index 95ec9d87ddcc..000000000000
--- a/packages/@tailwindcss-optimize/README.md
+++ /dev/null
@@ -1,40 +0,0 @@
-<p align="center">
-  <a href="https://tailwindcss.com" target="_blank">
-    <picture>
-      <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-dark.svg">
-      <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg">
-      <img alt="Tailwind CSS" src="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg" width="350" height="70" style="max-width: 100%;">
-    </picture>
-  </a>
-</p>
-
-<p align="center">
-  A utility-first CSS framework for rapidly building custom user interfaces.
-</p>
-
-<p align="center">
-    <a href="https://github.com/tailwindlabs/tailwindcss/actions"><img src="https://img.shields.io/github/actions/workflow/status/tailwindlabs/tailwindcss/ci.yml?branch=next" alt="Build Status"></a>
-    <a href="https://www.npmjs.com/package/tailwindcss"><img src="https://img.shields.io/npm/dt/tailwindcss.svg" alt="Total Downloads"></a>
-    <a href="https://github.com/tailwindcss/tailwindcss/releases"><img src="https://img.shields.io/npm/v/tailwindcss.svg" alt="Latest Release"></a>
-    <a href="https://github.com/tailwindcss/tailwindcss/blob/master/LICENSE"><img src="https://img.shields.io/npm/l/tailwindcss.svg" alt="License"></a>
-</p>
-
----
-
-## Documentation
-
-For full documentation, visit [tailwindcss.com](https://tailwindcss.com).
-
-## Community
-
-For help, discussion about best practices, or any other conversation that would benefit from being searchable:
-
-[Discuss Tailwind CSS on GitHub](https://github.com/tailwindcss/tailwindcss/discussions)
-
-For chatting with others using the framework:
-
-[Join the Tailwind CSS Discord Server](https://discord.gg/7NF8GNe)
-
-## Contributing
-
-If you're interested in contributing to Tailwind CSS, please read our [contributing docs](https://github.com/tailwindcss/tailwindcss/blob/next/.github/CONTRIBUTING.md) **before submitting a pull request**.
diff --git a/packages/@tailwindcss-optimize/package.json b/packages/@tailwindcss-optimize/package.json
deleted file mode 100644
index 99f2dadb507a..000000000000
--- a/packages/@tailwindcss-optimize/package.json
+++ /dev/null
@@ -1,39 +0,0 @@
-{
-  "name": "@tailwindcss/optimize",
-  "version": "4.0.0-alpha.8",
-  "license": "MIT",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/tailwindlabs/tailwindcss.git",
-    "directory": "packages/@tailwindcss-optimize"
-  },
-  "bugs": "https://github.com/tailwindlabs/tailwindcss/issues",
-  "homepage": "https://tailwindcss.com",
-  "scripts": {
-    "lint": "tsc --noEmit",
-    "build": "tsup-node ./src/index.ts --format esm,cjs --dts --cjsInterop --splitting --minify --clean",
-    "dev": "pnpm run build -- --watch"
-  },
-  "files": [
-    "dist/"
-  ],
-  "exports": {
-    ".": {
-      "types": "./src/index.ts",
-      "require": "./dist/index.js",
-      "import": "./src/index.ts"
-    }
-  },
-  "publishConfig": {
-    "provenance": true,
-    "access": "public",
-    ".": {
-      "types": "./dist/index.d.ts",
-      "require": "./dist/index.js",
-      "import": "./dist/index.mjs"
-    }
-  },
-  "dependencies": {
-    "lightningcss": "^1.24.0"
-  }
-}
diff --git a/packages/@tailwindcss-optimize/src/index.test.ts b/packages/@tailwindcss-optimize/src/index.test.ts
deleted file mode 100644
index 23ce3eec6b6f..000000000000
--- a/packages/@tailwindcss-optimize/src/index.test.ts
+++ /dev/null
@@ -1,32 +0,0 @@
-import { expect, it } from 'vitest'
-import { optimizeCss } from '.'
-
-let css = String.raw
-
-it('should optimize the CSS', () => {
-  expect(
-    optimizeCss(css`
-      .foo {
-        color: white;
-      }
-    `),
-  ).toMatchInlineSnapshot(`
-    ".foo {
-      color: #fff;
-    }
-    "
-  `)
-})
-
-it('should optimize and minify the CSS', () => {
-  expect(
-    optimizeCss(
-      css`
-        .foo {
-          color: white;
-        }
-      `,
-      { minify: true },
-    ),
-  ).toMatchInlineSnapshot(`".foo{color:#fff}"`)
-})
diff --git a/packages/@tailwindcss-optimize/src/index.ts b/packages/@tailwindcss-optimize/src/index.ts
deleted file mode 100644
index 91ef728e5fd0..000000000000
--- a/packages/@tailwindcss-optimize/src/index.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import { Features, transform } from 'lightningcss'
-
-export function optimizeCss(
-  input: string,
-  { file = 'input.css', minify = false }: { file?: string; minify?: boolean } = {},
-) {
-  return transform({
-    filename: file,
-    code: Buffer.from(input),
-    minify,
-    sourceMap: false,
-    drafts: {
-      customMedia: true,
-    },
-    nonStandard: {
-      deepSelectorCombinator: true,
-    },
-    include: Features.Nesting,
-    exclude: Features.LogicalProperties,
-    targets: {
-      safari: (16 << 16) | (4 << 8),
-    },
-    errorRecovery: true,
-  }).code.toString()
-}
diff --git a/packages/@tailwindcss-optimize/tsconfig.json b/packages/@tailwindcss-optimize/tsconfig.json
deleted file mode 100644
index 6ae022f65bf0..000000000000
--- a/packages/@tailwindcss-optimize/tsconfig.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "extends": "../tsconfig.base.json",
-}
diff --git a/packages/@tailwindcss-postcss/package.json b/packages/@tailwindcss-postcss/package.json
index ee3f7b479197..71f3aa518333 100644
--- a/packages/@tailwindcss-postcss/package.json
+++ b/packages/@tailwindcss-postcss/package.json
@@ -29,8 +29,8 @@
     }
   },
   "dependencies": {
-    "@tailwindcss/optimize": "workspace:^",
     "@tailwindcss/oxide": "workspace:^",
+    "lightningcss": "^1.24.0",
     "postcss-import": "^16.0.0",
     "tailwindcss": "workspace:^"
   },
diff --git a/packages/@tailwindcss-postcss/src/index.ts b/packages/@tailwindcss-postcss/src/index.ts
index 395bca5199b0..6ccaff3f0bd8 100644
--- a/packages/@tailwindcss-postcss/src/index.ts
+++ b/packages/@tailwindcss-postcss/src/index.ts
@@ -1,6 +1,6 @@
-import { optimizeCss } from '@tailwindcss/optimize'
 import { scanDir } from '@tailwindcss/oxide'
 import fs from 'fs'
+import { Features, transform } from 'lightningcss'
 import postcss, { type AcceptedPlugin, type PluginCreator } from 'postcss'
 import postcssImport from 'postcss-import'
 import { compile } from 'tailwindcss'
@@ -151,4 +151,28 @@ function tailwindcss(opts: PluginOptions = {}): AcceptedPlugin {
   }
 }
 
+function optimizeCss(
+  input: string,
+  { file = 'input.css', minify = false }: { file?: string; minify?: boolean } = {},
+) {
+  return transform({
+    filename: file,
+    code: Buffer.from(input),
+    minify,
+    sourceMap: false,
+    drafts: {
+      customMedia: true,
+    },
+    nonStandard: {
+      deepSelectorCombinator: true,
+    },
+    include: Features.Nesting,
+    exclude: Features.LogicalProperties,
+    targets: {
+      safari: (16 << 16) | (4 << 8),
+    },
+    errorRecovery: true,
+  }).code.toString()
+}
+
 export default Object.assign(tailwindcss, { postcss: true }) as PluginCreator<PluginOptions>
diff --git a/packages/@tailwindcss-vite/package.json b/packages/@tailwindcss-vite/package.json
index 7a094c90b04d..4598790210a5 100644
--- a/packages/@tailwindcss-vite/package.json
+++ b/packages/@tailwindcss-vite/package.json
@@ -28,8 +28,8 @@
     }
   },
   "dependencies": {
-    "@tailwindcss/optimize": "workspace:^",
     "@tailwindcss/oxide": "workspace:^",
+    "lightningcss": "^1.24.0",
     "tailwindcss": "workspace:^"
   },
   "devDependencies": {
diff --git a/packages/@tailwindcss-vite/src/index.ts b/packages/@tailwindcss-vite/src/index.ts
index e356d0a6fe35..f3eb187906e8 100644
--- a/packages/@tailwindcss-vite/src/index.ts
+++ b/packages/@tailwindcss-vite/src/index.ts
@@ -1,5 +1,5 @@
-import { optimizeCss } from '@tailwindcss/optimize'
 import { IO, Parsing, scanFiles } from '@tailwindcss/oxide'
+import { Features, transform } from 'lightningcss'
 import path from 'path'
 import { compile } from 'tailwindcss'
 import type { Plugin, Update, ViteDevServer } from 'vite'
@@ -182,3 +182,27 @@ export default function tailwindcss(): Plugin[] {
     },
   ] satisfies Plugin[]
 }
+
+function optimizeCss(
+  input: string,
+  { file = 'input.css', minify = false }: { file?: string; minify?: boolean } = {},
+) {
+  return transform({
+    filename: file,
+    code: Buffer.from(input),
+    minify,
+    sourceMap: false,
+    drafts: {
+      customMedia: true,
+    },
+    nonStandard: {
+      deepSelectorCombinator: true,
+    },
+    include: Features.Nesting,
+    exclude: Features.LogicalProperties,
+    targets: {
+      safari: (16 << 16) | (4 << 8),
+    },
+    errorRecovery: true,
+  }).code.toString()
+}
diff --git a/packages/tailwindcss/package.json b/packages/tailwindcss/package.json
index ea2ecba77052..ebcb49c7df1c 100644
--- a/packages/tailwindcss/package.json
+++ b/packages/tailwindcss/package.json
@@ -59,8 +59,8 @@
     "utilities.css"
   ],
   "devDependencies": {
-    "@tailwindcss/optimize": "workspace:^",
     "@tailwindcss/oxide": "workspace:^",
-    "@types/node": "^20.10.8"
+    "@types/node": "^20.10.8",
+    "lightningcss": "^1.24.0"
   }
 }
diff --git a/packages/tailwindcss/src/test-utils/run.ts b/packages/tailwindcss/src/test-utils/run.ts
index cb4b3e3b4989..d360f2eaaed7 100644
--- a/packages/tailwindcss/src/test-utils/run.ts
+++ b/packages/tailwindcss/src/test-utils/run.ts
@@ -1,4 +1,4 @@
-import { optimizeCss } from '@tailwindcss/optimize'
+import { Features, transform } from 'lightningcss'
 import { compile } from '..'
 
 export function compileCss(css: string, candidates: string[] = []) {
@@ -8,3 +8,27 @@ export function compileCss(css: string, candidates: string[] = []) {
 export function run(candidates: string[]) {
   return optimizeCss(compile('@tailwind utilities;').build(candidates)).trim()
 }
+
+export function optimizeCss(
+  input: string,
+  { file = 'input.css', minify = false }: { file?: string; minify?: boolean } = {},
+) {
+  return transform({
+    filename: file,
+    code: Buffer.from(input),
+    minify,
+    sourceMap: false,
+    drafts: {
+      customMedia: true,
+    },
+    nonStandard: {
+      deepSelectorCombinator: true,
+    },
+    include: Features.Nesting,
+    exclude: Features.LogicalProperties,
+    targets: {
+      safari: (16 << 16) | (4 << 8),
+    },
+    errorRecovery: true,
+  }).code.toString()
+}
diff --git a/packages/tailwindcss/tests/ui.spec.ts b/packages/tailwindcss/tests/ui.spec.ts
index aa6526d22a91..a28f64001a6a 100644
--- a/packages/tailwindcss/tests/ui.spec.ts
+++ b/packages/tailwindcss/tests/ui.spec.ts
@@ -1,9 +1,9 @@
 import { expect, test, type Page } from '@playwright/test'
-import { optimizeCss } from '@tailwindcss/optimize'
 import { IO, Parsing, scanFiles } from '@tailwindcss/oxide'
 import fs from 'fs'
 import path from 'path'
 import { compile } from '../src'
+import { optimizeCss } from '../src/test-utils/run'
 
 const html = String.raw
 const css = String.raw
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 612b284b7873..1161f7e1e3f5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -100,12 +100,12 @@ importers:
       '@parcel/watcher':
         specifier: ^2.4.1
         version: 2.4.1
-      '@tailwindcss/optimize':
-        specifier: workspace:^
-        version: link:../@tailwindcss-optimize
       '@tailwindcss/oxide':
         specifier: workspace:^
         version: link:../../oxide/crates/node
+      lightningcss:
+        specifier: ^1.24.0
+        version: 1.24.0
       mri:
         specifier: ^1.2.0
         version: 1.2.0
@@ -134,12 +134,12 @@ importers:
 
   packages/@tailwindcss-postcss:
     dependencies:
-      '@tailwindcss/optimize':
-        specifier: workspace:^
-        version: link:../@tailwindcss-optimize
       '@tailwindcss/oxide':
         specifier: workspace:^
         version: link:../../oxide/crates/node
+      lightningcss:
+        specifier: ^1.24.0
+        version: 1.24.0
       postcss-import:
         specifier: ^16.0.0
         version: 16.0.0(postcss@8.4.24)
@@ -159,12 +159,12 @@ importers:
 
   packages/@tailwindcss-vite:
     dependencies:
-      '@tailwindcss/optimize':
-        specifier: workspace:^
-        version: link:../@tailwindcss-optimize
       '@tailwindcss/oxide':
         specifier: workspace:^
         version: link:../../oxide/crates/node
+      lightningcss:
+        specifier: ^1.24.0
+        version: 1.24.0
       tailwindcss:
         specifier: workspace:^
         version: link:../tailwindcss
@@ -174,19 +174,19 @@ importers:
         version: 20.11.17
       vite:
         specifier: ^5.0.11
-        version: 5.1.1(@types/node@20.11.17)
+        version: 5.1.1(@types/node@20.11.17)(lightningcss@1.24.0)
 
   packages/tailwindcss:
     devDependencies:
-      '@tailwindcss/optimize':
-        specifier: workspace:^
-        version: link:../@tailwindcss-optimize
       '@tailwindcss/oxide':
         specifier: workspace:^
         version: link:../../oxide/crates/node
       '@types/node':
         specifier: ^20.10.8
         version: 20.11.17
+      lightningcss:
+        specifier: ^1.24.0
+        version: 1.24.0
 
   playgrounds/nextjs:
     dependencies:
@@ -1892,7 +1892,6 @@ packages:
     resolution: {integrity: sha512-pGjwhsmsp4kL2RTz08wcOlGN83otlqHeD/Z5T8GXZB+/YcpQ/dgo+lbU8ZsGxV0HIvqqxo9l7mqYwyYMD9bKDg==}
     engines: {node: '>=0.10'}
     hasBin: true
-    dev: false
 
   /diff-sequences@29.6.3:
     resolution: {integrity: sha512-EjePK1srD3P08o2j4f0ExnylqRs5B9tJjcp9t1krH2qRi8CCdsYfwe9JgSLurFBWwq4uOlipzfk5fHNvwFKr8Q==}
@@ -3066,7 +3065,6 @@ packages:
     cpu: [arm64]
     os: [darwin]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-darwin-x64@1.24.0:
@@ -3075,7 +3073,6 @@ packages:
     cpu: [x64]
     os: [darwin]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-freebsd-x64@1.24.0:
@@ -3084,7 +3081,6 @@ packages:
     cpu: [x64]
     os: [freebsd]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-linux-arm-gnueabihf@1.24.0:
@@ -3093,7 +3089,6 @@ packages:
     cpu: [arm]
     os: [linux]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-linux-arm64-gnu@1.24.0:
@@ -3102,7 +3097,6 @@ packages:
     cpu: [arm64]
     os: [linux]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-linux-arm64-musl@1.24.0:
@@ -3111,7 +3105,6 @@ packages:
     cpu: [arm64]
     os: [linux]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-linux-x64-gnu@1.24.0:
@@ -3120,7 +3113,6 @@ packages:
     cpu: [x64]
     os: [linux]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-linux-x64-musl@1.24.0:
@@ -3129,7 +3121,6 @@ packages:
     cpu: [x64]
     os: [linux]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss-win32-x64-msvc@1.24.0:
@@ -3138,7 +3129,6 @@ packages:
     cpu: [x64]
     os: [win32]
     requiresBuild: true
-    dev: false
     optional: true
 
   /lightningcss@1.24.0:
@@ -3156,7 +3146,6 @@ packages:
       lightningcss-linux-x64-gnu: 1.24.0
       lightningcss-linux-x64-musl: 1.24.0
       lightningcss-win32-x64-msvc: 1.24.0
-    dev: false
 
   /lilconfig@3.0.0:
     resolution: {integrity: sha512-K2U4W2Ff5ibV7j7ydLr+zLAkIg5JJ4lPn1Ltsdt+Tz/IjQ8buJ55pZAxoP34lqIiwtF9iAvtLv3JGv7CAyAg+g==}
@@ -4473,7 +4462,7 @@ packages:
       - terser
     dev: true
 
-  /vite@5.1.1(@types/node@20.11.17):
+  /vite@5.1.1(@types/node@20.11.17)(lightningcss@1.24.0):
     resolution: {integrity: sha512-wclpAgY3F1tR7t9LL5CcHC41YPkQIpKUGeIuT8MdNwNZr6OqOTLs7JX5vIHAtzqLWXts0T+GDrh9pN2arneKqg==}
     engines: {node: ^18.0.0 || >=20.0.0}
     hasBin: true
@@ -4503,6 +4492,7 @@ packages:
     dependencies:
       '@types/node': 20.11.17
       esbuild: 0.19.12
+      lightningcss: 1.24.0
       postcss: 8.4.35
       rollup: 4.9.6
     optionalDependencies: