diff --git a/package-lock.json b/package-lock.json
index 87cadb77973..d84feb50465 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -85,7 +85,7 @@
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       },
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-        "@primer/react": "38.28.0",
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@@ -8794,9 +8794,9 @@
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@@ -8834,9 +8834,9 @@
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@@ -8854,9 +8854,9 @@
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@@ -8871,9 +8871,9 @@
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@@ -8960,9 +8960,9 @@
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-        "es-module-lexer": "^1.6.0",
-        "get-tsconfig": "^4.10.0",
-        "unplugin-utils": "^0.2.4"
-      },
-      "engines": {
-        "node": ">=14.18.0"
-      },
-      "peerDependencies": {
-        "esbuild": ">=0.18.0",
-        "rollup": "^1.20.0 || ^2.0.0 || ^3.0.0 || ^4.0.0"
-      }
-    },
     "node_modules/rollup-plugin-import-css": {
       "resolved": "packages/rollup-plugin-import-css",
       "link": true
@@ -27707,34 +27684,6 @@
         "node": ">=18.12.0"
       }
     },
-    "node_modules/unplugin-utils": {
-      "version": "0.2.4",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "pathe": "^2.0.2",
-        "picomatch": "^4.0.2"
-      },
-      "engines": {
-        "node": ">=18.12.0"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sxzz"
-      }
-    },
-    "node_modules/unplugin-utils/node_modules/picomatch": {
-      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
-      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/jonschlinkert"
-      }
-    },
     "node_modules/unplugin/node_modules/picomatch": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
@@ -29240,7 +29189,7 @@
     },
     "packages/canvas": {
       "name": "@primer/react-canvas",
-      "version": "0.0.1",
+      "version": "0.0.2",
       "devDependencies": {
         "@primer/primitives": "11.x",
         "@primer/react": "^38.27.0",
@@ -29766,7 +29715,7 @@
     },
     "packages/react": {
       "name": "@primer/react",
-      "version": "38.28.0",
+      "version": "38.29.0",
       "license": "MIT",
       "dependencies": {
         "@github/mini-throttle": "^2.1.1",
@@ -30212,14 +30161,9 @@
     "packages/rollup-plugin-import-css": {
       "version": "0.0.0",
       "devDependencies": {
-        "@rollup/plugin-commonjs": "^29.0.0",
-        "@rollup/plugin-node-resolve": "^16.0.3",
-        "esbuild": "^0.25.0",
         "postcss": "^8.4.38",
         "postcss-modules": "^6.0.0",
-        "rimraf": "^5.0.7",
-        "rollup-plugin-esbuild": "^6.2.1",
-        "rollup-plugin-typescript2": "^0.36.0",
+        "rolldown": "^1.1.2",
         "typescript": "^6.0.3"
       },
       "peerDependencies": {
@@ -30227,65 +30171,6 @@
         "postcss-modules": "^6.0.0"
       }
     },
-    "packages/rollup-plugin-import-css/node_modules/brace-expansion": {
-      "version": "2.0.2",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "balanced-match": "^1.0.0"
-      }
-    },
-    "packages/rollup-plugin-import-css/node_modules/glob": {
-      "version": "10.5.0",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-10.5.0.tgz",
-      "integrity": "sha512-DfXN8DfhJ7NH3Oe7cFmu3NCu1wKbkReJ8TorzSAFbSKrlNaQSKfIzqYqVY8zlbs2NLBbWpRiU52GX2PbaBVNkg==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "foreground-child": "^3.1.0",
-        "jackspeak": "^3.1.2",
-        "minimatch": "^9.0.4",
-        "minipass": "^7.1.2",
-        "package-json-from-dist": "^1.0.0",
-        "path-scurry": "^1.11.1"
-      },
-      "bin": {
-        "glob": "dist/esm/bin.mjs"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
-    "packages/rollup-plugin-import-css/node_modules/jackspeak": {
-      "version": "3.4.3",
-      "dev": true,
-      "license": "BlueOak-1.0.0",
-      "dependencies": {
-        "@isaacs/cliui": "^8.0.2"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      },
-      "optionalDependencies": {
-        "@pkgjs/parseargs": "^0.11.0"
-      }
-    },
-    "packages/rollup-plugin-import-css/node_modules/minimatch": {
-      "version": "9.0.9",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.9.tgz",
-      "integrity": "sha512-OBwBN9AL4dqmETlpS2zasx+vTeWclWzkblfZk7KTA5j3jeOONz/tRCnZomUyvNg83wL5Zv9Ss6HMJXAgL8R2Yg==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "brace-expansion": "^2.0.2"
-      },
-      "engines": {
-        "node": ">=16 || 14 >=14.17"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "packages/rollup-plugin-import-css/node_modules/postcss-modules": {
       "version": "6.0.1",
       "dev": true,
@@ -30304,20 +30189,6 @@
         "postcss": "^8.0.0"
       }
     },
-    "packages/rollup-plugin-import-css/node_modules/rimraf": {
-      "version": "5.0.10",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "glob": "^10.3.7"
-      },
-      "bin": {
-        "rimraf": "dist/esm/bin.mjs"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/isaacs"
-      }
-    },
     "packages/styled-react": {
       "name": "@primer/styled-react",
       "version": "1.1.0",
diff --git a/packages/rollup-plugin-import-css/README.md b/packages/rollup-plugin-import-css/README.md
index e89da8734c5..f5d0d91282e 100644
--- a/packages/rollup-plugin-import-css/README.md
+++ b/packages/rollup-plugin-import-css/README.md
@@ -1,12 +1,12 @@
 # rollup-plugin-import-css
 
-> A Rollup plugin to include generated CSS alongside transformed CSS Modules so
+> A Rolldown plugin to include generated CSS alongside transformed CSS Modules so
 > that importing a component from a library includes its CSS.
 
 ## Usage
 
 ```ts
-// rollup.config.js
+// rolldown.config.js
 import {importCSS} from 'rollup-plugin-import-css'
 
 export default {
diff --git a/packages/rollup-plugin-import-css/package.json b/packages/rollup-plugin-import-css/package.json
index 2de3739f9c9..5e25bca0e48 100644
--- a/packages/rollup-plugin-import-css/package.json
+++ b/packages/rollup-plugin-import-css/package.json
@@ -4,28 +4,20 @@
   "private": true,
   "type": "module",
   "exports": {
-    "types": "./dist/index.d.ts",
-    "default": "./dist/index.js"
+    "types": "./src/index.ts",
+    "default": "./src/index.ts"
   },
   "scripts": {
-    "build": "rollup -c",
-    "clean": "rimraf dist",
-    "type-check": "tsc --noEmit",
-    "watch": "rollup -c -w"
+    "type-check": "tsc --noEmit"
   },
   "peerDependencies": {
     "postcss": "^8.4.38",
     "postcss-modules": "^6.0.0"
   },
   "devDependencies": {
-    "@rollup/plugin-commonjs": "^29.0.0",
-    "@rollup/plugin-node-resolve": "^16.0.3",
-    "esbuild": "^0.25.0",
     "postcss": "^8.4.38",
     "postcss-modules": "^6.0.0",
-    "rimraf": "^5.0.7",
-    "rollup-plugin-esbuild": "^6.2.1",
-    "rollup-plugin-typescript2": "^0.36.0",
+    "rolldown": "^1.1.2",
     "typescript": "^6.0.3"
   },
   "sideEffects": false
diff --git a/packages/rollup-plugin-import-css/rollup.config.js b/packages/rollup-plugin-import-css/rollup.config.js
deleted file mode 100644
index da639769421..00000000000
--- a/packages/rollup-plugin-import-css/rollup.config.js
+++ /dev/null
@@ -1,43 +0,0 @@
-import {nodeResolve} from '@rollup/plugin-node-resolve'
-import commonjs from '@rollup/plugin-commonjs'
-import typescript from 'rollup-plugin-typescript2'
-import esbuild from 'rollup-plugin-esbuild'
-import packageJson from './package.json' with {type: 'json'}
-
-const dependencyTypes = ['dependencies', 'devDependencies', 'peerDependencies', 'optionalDependencies']
-const dependencies = new Set(
-  dependencyTypes.flatMap(type => {
-    if (packageJson[type]) {
-      return Object.keys(packageJson[type])
-    }
-    return []
-  }),
-)
-const external = Array.from(dependencies).map(name => {
-  return new RegExp(`^${name}(/.*)?`)
-})
-
-export default [
-  {
-    input: ['./src/index.ts'],
-    external,
-    plugins: [
-      nodeResolve({
-        include: /node_modules/,
-      }),
-      commonjs({
-        include: /node_modules/,
-      }),
-      typescript({
-        tsconfig: 'tsconfig.build.json',
-      }),
-      esbuild(),
-    ],
-    output: {
-      dir: 'dist',
-      format: 'esm',
-      preserveModules: true,
-      preserveModulesRoot: 'src',
-    },
-  },
-]
diff --git a/packages/rollup-plugin-import-css/src/index.ts b/packages/rollup-plugin-import-css/src/index.ts
index da5a2debfec..349ce371df5 100644
--- a/packages/rollup-plugin-import-css/src/index.ts
+++ b/packages/rollup-plugin-import-css/src/index.ts
@@ -1,4 +1,4 @@
-import type {Plugin} from 'rollup'
+import type {Plugin} from 'rolldown'
 import fs from 'node:fs/promises'
 import path from 'node:path'
 import {createHash} from 'node:crypto'