diff --git a/expf.config.json b/expf.config.json
index 22cf65c..2d0ef2d 100644
--- a/expf.config.json
+++ b/expf.config.json
@@ -1,3 +1,3 @@
 {
-  "write": false
+  "write": true
 }
diff --git a/package-lock.json b/package-lock.json
index e8d7e4c..8ace9ac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,10 @@
         "./servers/*",
         "./perf/load/*",
         "./perf/bench/*"
-      ]
+      ],
+      "dependencies": {
+        "uWebSockets.js": "github:uNetworking/uWebSockets.js#v20.74.0"
+      }
     },
     "node_modules/@assemblyscript/loader": {
       "version": "0.19.23",
@@ -472,6 +475,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "license": "MIT"
+    },
     "node_modules/array-includes": {
       "version": "3.1.9",
       "dev": true,
@@ -1211,6 +1220,16 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/destroy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
+      "integrity": "sha512-2sJGJTaXIIaR1w4iJSNoN0hnMY7Gpc/n8D4qSCJw8QqFWXf7cuAgnEHxBpweaVcPevC2l3KpjYCx3NypQQgaJg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
     "node_modules/distributions": {
       "version": "2.2.0",
       "license": "MIT",
@@ -2489,6 +2508,12 @@
       "version": "0.5.10",
       "license": "MIT"
     },
+    "node_modules/http-status-codes": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/http-status-codes/-/http-status-codes-2.3.0.tgz",
+      "integrity": "sha512-RJ8XvFvpPM/Dmc5SV+dC4y5PCeOhT3x1Hq0NU3rjGeg5a/CqlhZ7uudknPwZFz4aeAXDcbAyaeP7GAo9lvngtA==",
+      "license": "MIT"
+    },
     "node_modules/http2-wrapper": {
       "version": "1.0.3",
       "license": "MIT",
@@ -3174,6 +3199,27 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/methods": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
+      "integrity": "sha512-iclAHeNqNm68zFtnZ0e+1L2yUIdvzNoauKU4WBA3VvH/vPFieF7qfRlwUZU+DA9P9bPXIS90ulxoUoCH23sV2w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/mime": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.6.0.tgz",
+      "integrity": "sha512-USPkMeET31rOMiarsBNIHZKLGgvKc/LrjofAnBlOttf5ajRvqiRA8QsenbcooctK6d6Ts6aqZXBA+XbkKthiQg==",
+      "license": "MIT",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
     "node_modules/mime-db": {
       "version": "1.54.0",
       "license": "MIT",
@@ -4659,6 +4705,15 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
     "node_modules/uuid": {
       "version": "8.3.2",
       "license": "MIT",
@@ -4670,6 +4725,311 @@
       "version": "1.1.0",
       "license": "MIT"
     },
+    "node_modules/uwebsockets-express": {
+      "version": "1.3.13",
+      "resolved": "https://registry.npmjs.org/uwebsockets-express/-/uwebsockets-express-1.3.13.tgz",
+      "integrity": "sha512-EGv0q/D5KhV/V6CjlUalWfzKrcTihLPyQjnImR3hngviWg/UHtKX+SOI0+5lOLr+QjjfOHrKwc1jkXedAtMOmw==",
+      "license": "MIT",
+      "dependencies": {
+        "express": "^4.18.1",
+        "http-status-codes": "^2.1.4",
+        "mime": "^2.5.2",
+        "path-to-regexp": "^0.1.7"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/body-parser": {
+      "version": "1.20.4",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
+      "integrity": "sha512-ZTgYYLMOXY9qKU/57FAo8F+HA2dGX7bqGc71txDRC1rS4frdFI5R7NhluHxH6M0YItAP0sHB4uqAOcYKxO6uGA==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "~3.1.2",
+        "content-type": "~1.0.5",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "~1.2.0",
+        "http-errors": "~2.0.1",
+        "iconv-lite": "~0.4.24",
+        "on-finished": "~2.4.1",
+        "qs": "~6.14.0",
+        "raw-body": "~2.5.3",
+        "type-is": "~1.6.18",
+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8",
+        "npm": "1.2.8000 || >= 1.4.16"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "5.2.1"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/cookie-signature": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.7.tgz",
+      "integrity": "sha512-NXdYc3dLr47pBkpUCHtKSwIOQXLVn8dZEuywboCOJY/osA0wFSLlSawr3KN8qXJEyX66FcONTH8EIlVuK0yyFA==",
+      "license": "MIT"
+    },
+    "node_modules/uwebsockets-express/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/debug/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
+      "license": "MIT"
+    },
+    "node_modules/uwebsockets-express/node_modules/express": {
+      "version": "4.22.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.22.1.tgz",
+      "integrity": "sha512-F2X8g9P1X7uCPZMA3MVf9wcTqlyNp7IhH5qPCI0izhaOIYXaW9L535tGA3qmjRzpH+bZczqq7hVKxTR4NWnu+g==",
+      "license": "MIT",
+      "dependencies": {
+        "accepts": "~1.3.8",
+        "array-flatten": "1.1.1",
+        "body-parser": "~1.20.3",
+        "content-disposition": "~0.5.4",
+        "content-type": "~1.0.4",
+        "cookie": "~0.7.1",
+        "cookie-signature": "~1.0.6",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "encodeurl": "~2.0.0",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "finalhandler": "~1.3.1",
+        "fresh": "~0.5.2",
+        "http-errors": "~2.0.0",
+        "merge-descriptors": "1.0.3",
+        "methods": "~1.1.2",
+        "on-finished": "~2.4.1",
+        "parseurl": "~1.3.3",
+        "path-to-regexp": "~0.1.12",
+        "proxy-addr": "~2.0.7",
+        "qs": "~6.14.0",
+        "range-parser": "~1.2.1",
+        "safe-buffer": "5.2.1",
+        "send": "~0.19.0",
+        "serve-static": "~1.16.2",
+        "setprototypeof": "1.2.0",
+        "statuses": "~2.0.1",
+        "type-is": "~1.6.18",
+        "utils-merge": "1.0.1",
+        "vary": "~1.1.2"
+      },
+      "engines": {
+        "node": ">= 0.10.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/finalhandler": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.3.2.tgz",
+      "integrity": "sha512-aA4RyPcd3badbdABGDuTXCMTtOneUCAYH/gxoYRTZlIJdF0YPWuGqiAsIrhNnnqdXGswYk6dGujem4w80UJFhg==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "2.6.9",
+        "encodeurl": "~2.0.0",
+        "escape-html": "~1.0.3",
+        "on-finished": "~2.4.1",
+        "parseurl": "~1.3.3",
+        "statuses": "~2.0.2",
+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/fresh": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
+      "integrity": "sha512-zJ2mQYM18rEFOudeV4GShTGIQ7RbzA7ozbU9I/XBpm7kqgMywgmylMwXHxZJmkVoYkna9d2pVXVXPdYTP9ej8Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/iconv-lite": {
+      "version": "0.4.24",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+      "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+      "license": "MIT",
+      "dependencies": {
+        "safer-buffer": ">= 2.1.2 < 3"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/media-typer": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha512-dq+qelQ9akHpcOl/gUVRTxVIOkAJ1wR3QAvb4RsVjS8oVoFjDGTc679wJYmUmknUF5HwMLOgb5O+a3KxfWapPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/merge-descriptors": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.3.tgz",
+      "integrity": "sha512-gaNvAS7TZ897/rVaZ0nMtAyxNyi/pdbjbAwUpFQpN70GqnVfOiXpeUUMKRBmzXaSQ8DdTX4/0ms62r2K+hE6mQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/negotiator": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
+      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/path-to-regexp": {
+      "version": "0.1.12",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.12.tgz",
+      "integrity": "sha512-RA1GjUVMnvYFxuqovrEqZoxxW5NUZqbwKtYz/Tt7nXerk0LbLblQmrsgdeOxV5SFHf0UDggjS/bSeOZwt1pmEQ==",
+      "license": "MIT"
+    },
+    "node_modules/uwebsockets-express/node_modules/raw-body": {
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.5.3.tgz",
+      "integrity": "sha512-s4VSOf6yN0rvbRZGxs8Om5CWj6seneMwK3oDb4lWDH0UPhWcxwOWw5+qk24bxq87szX1ydrwylIOp2uG1ojUpA==",
+      "license": "MIT",
+      "dependencies": {
+        "bytes": "~3.1.2",
+        "http-errors": "~2.0.1",
+        "iconv-lite": "~0.4.24",
+        "unpipe": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/send": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.19.2.tgz",
+      "integrity": "sha512-VMbMxbDeehAxpOtWJXlcUS5E8iXh6QmN+BkRX1GARS3wRaXEEgzCcB10gTQazO42tpNIya8xIyNx8fll1OFPrg==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "encodeurl": "~2.0.0",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "~0.5.2",
+        "http-errors": "~2.0.1",
+        "mime": "1.6.0",
+        "ms": "2.1.3",
+        "on-finished": "~2.4.1",
+        "range-parser": "~1.2.1",
+        "statuses": "~2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/send/node_modules/mime": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+      "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+      "license": "MIT",
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/serve-static": {
+      "version": "1.16.3",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.16.3.tgz",
+      "integrity": "sha512-x0RTqQel6g5SY7Lg6ZreMmsOzncHFU7nhnRWkKgWuMTu5NN0DR5oruckMqRvacAN9d5w6ARnRBXl9xhDCgfMeA==",
+      "license": "MIT",
+      "dependencies": {
+        "encodeurl": "~2.0.0",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "~0.19.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/uwebsockets-express/node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "license": "MIT",
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/uWebSockets.js": {
+      "version": "20.49.0",
+      "resolved": "git+ssh://git@github.com/uNetworking/uWebSockets.js.git#442087c0a01bf146acb7386910739ec81df06700",
+      "license": "Apache-2.0"
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "license": "MIT",
@@ -4980,7 +5340,9 @@
       "license": "ISC",
       "dependencies": {
         "@expressjs/perf-requests": "file:../../../packages/requests",
-        "@expressjs/perf-servers-express-helloworld": "file:../../../servers/express-helloworld"
+        "@expressjs/perf-servers-express-helloworld": "file:../../../servers/express-helloworld",
+        "uwebsockets-express": "1.3.13",
+        "uWebSockets.js": "uNetworking/uWebSockets.js#v20.51.0"
       }
     },
     "perf/load/extended-query": {
diff --git a/package.json b/package.json
index 9e7f635..4fee65c 100644
--- a/package.json
+++ b/package.json
@@ -24,5 +24,8 @@
     "./servers/*",
     "./perf/load/*",
     "./perf/bench/*"
-  ]
+  ],
+  "dependencies": {
+    "uWebSockets.js": "github:uNetworking/uWebSockets.js#v20.74.0"
+  }
 }
diff --git a/packages/cli/bin/expf.mjs b/packages/cli/bin/expf.mjs
index 0f2cd71..d054aaa 100644
--- a/packages/cli/bin/expf.mjs
+++ b/packages/cli/bin/expf.mjs
@@ -61,6 +61,11 @@ const { values, positionals } = parseArgs({
 
     'force-rebuild': {
       type: 'boolean'
+    },
+
+    uws: {
+      type: 'boolean',
+      default: false
     }
   }
 });
diff --git a/packages/cli/load.mjs b/packages/cli/load.mjs
index 4d07126..ef68e1c 100644
--- a/packages/cli/load.mjs
+++ b/packages/cli/load.mjs
@@ -22,12 +22,22 @@ export function help (opts = {}) {
     --config=./expf.config.json
     --[no-]write
     --[no-]parallel
+    --uws                              Enable uWebSockets.js via uwebsockets-express
+                                       (auto-selects v1.3.13 for Express 4, v2.0.0 for Express 5)
 
   Runners:
     - @expressjs/perf-runner-vanilla: local docker based runner
       - Flags: --force-rebuild
     - @expressjs/perf-runner-nsolid: local docker based runner with nsolid
       - Flags: --force-rebuild
+
+  Examples:
+
+    # Express 5 (default) with uWebSockets.js
+    expf load --uws
+
+    # Express 4 with uWebSockets.js
+    expf load --uws --overrides='{"express":"4.21.2"}'
 `
 }
 
diff --git a/packages/runner-local/server.mjs b/packages/runner-local/server.mjs
index 3fa3386..c0aedde 100644
--- a/packages/runner-local/server.mjs
+++ b/packages/runner-local/server.mjs
@@ -8,7 +8,13 @@ export async function startServer (cwd, opts = {}) {
   }
   return new Promise((resolve, reject) => {
     const test = fileURLToPath(import.meta.resolve(opts.test));
-    const cp = execFile(process.execPath, [ test ], { cwd });
+    const cp = execFile(process.execPath, [ test ], { 
+      cwd,
+      env: {
+        ...process.env,
+        ...(opts.uws ? { USE_UWS: '1' } : {})
+      }
+    });
 
     const server = {
       metadata: {
diff --git a/packages/runner-local/setup.mjs b/packages/runner-local/setup.mjs
index b2da817..f52f2e8 100644
--- a/packages/runner-local/setup.mjs
+++ b/packages/runner-local/setup.mjs
@@ -56,17 +56,48 @@ export async function setup (cwd, opts = {}) {
     }
   })).default;
 
-  // Apply overrides
-  if (opts.overrides) {
+  // Apply overrides and uws dependencies
+  const needsModification = opts.overrides || opts.uws;
+  if (needsModification) {
     await rename(pkgPath, pkgBakPath);
     // Imports are immutable
     const _pkg = {
-      ...pkg,
-      overrides: {
+      ...pkg
+    };
+
+    // Apply overrides
+    if (opts.overrides) {
+      _pkg.overrides = {
         ...(pkg.overrides ?? {}),
         ...opts.overrides
+      };
+    }
+
+    // Add uwebsockets-express dependencies when --uws is enabled
+    if (opts.uws) {
+      // Use explicit version from overrides if provided, otherwise auto-detect
+      let uwsExpressVersion = opts.overrides?.['uwebsockets-express'];
+      
+      if (!uwsExpressVersion) {
+        // Determine uwebsockets-express version based on express version
+        const expressVersion = opts.overrides?.express || pkg.dependencies?.express || '';
+        // Handle semver ranges like ^4, ~4, 4.x, 4.21.2, etc.
+        const isExpress4 = /^[~^]?4|^4\./.test(expressVersion);
+        uwsExpressVersion = isExpress4 ? '1.3.13' : '2.0.0';
       }
-    };
+      
+      _pkg.dependencies = {
+        ...(pkg.dependencies ?? {}),
+        'uWebSockets.js': 'uNetworking/uWebSockets.js#v20.51.0',
+        'uwebsockets-express': uwsExpressVersion
+      };
+
+      // Remove uwebsockets-express from overrides to avoid conflict with dependency
+      if (_pkg.overrides?.['uwebsockets-express']) {
+        delete _pkg.overrides['uwebsockets-express'];
+      }
+    }
+
     await writeFile(pkgPath, JSON.stringify(_pkg, null, 2));
   }
 
diff --git a/servers/express-body-parser/index.js b/servers/express-body-parser/index.js
index 4cda340..7ae668a 100644
--- a/servers/express-body-parser/index.js
+++ b/servers/express-body-parser/index.js
@@ -2,7 +2,16 @@ const start = process.hrtime();
 const express = require('express');
 const expressVersion = require('express/package.json').version;
 
-const app = express();
+let app;
+if (process.env.USE_UWS) {
+  const uWS = require('uWebSockets.js');
+  const expressify = require('uwebsockets-express').default;
+  const uwsApp = uWS.App();
+  app = expressify(uwsApp);
+} else {
+  app = express();
+}
+
 app.use(express.json());
 app.use(express.urlencoded());
 app.use(express.text());
diff --git a/servers/express-extended-query/index.js b/servers/express-extended-query/index.js
index b6ab3d0..fa1d554 100644
--- a/servers/express-extended-query/index.js
+++ b/servers/express-extended-query/index.js
@@ -1,7 +1,16 @@
 const start = process.hrtime();
-const express = require('express');
 
-const app = express();
+let app;
+if (process.env.USE_UWS) {
+  const uWS = require('uWebSockets.js');
+  const expressify = require('uwebsockets-express').default;
+  const uwsApp = uWS.App();
+  app = expressify(uwsApp);
+} else {
+  const express = require('express');
+  app = express();
+}
+
 app.set('query parser', 'extended');
 app.get('*path', (req, res) => {
   res.status(200).json({
diff --git a/servers/express-helloworld/index.js b/servers/express-helloworld/index.js
index 331e810..e948b51 100644
--- a/servers/express-helloworld/index.js
+++ b/servers/express-helloworld/index.js
@@ -1,8 +1,17 @@
 const start = process.hrtime();
-const express = require('express');
 const expressVersion = require('express/package.json').version;
 
-const app = express();
+let app;
+if (process.env.USE_UWS) {
+  const uWS = require('uWebSockets.js');
+  const expressify = require('uwebsockets-express').default;
+  const uwsApp = uWS.App();
+  app = expressify(uwsApp);
+} else {
+  const express = require('express');
+  app = express();
+}
+
 app.get(expressVersion.startsWith('4.') ? '*' : '*path', (req, res) => {
   res.status(200).json({
     hello: 'world!',
diff --git a/servers/express-todo/server.js b/servers/express-todo/server.js
index 8278ed0..854670d 100644
--- a/servers/express-todo/server.js
+++ b/servers/express-todo/server.js
@@ -8,9 +8,18 @@ const morgan = require('morgan');
 const bodyParser = require('body-parser');
 const crypto = require('crypto');
 
-const app = express();
 const PORT = process.env.PORT || 3000;
 
+let app;
+if (process.env.USE_UWS) {
+  const uWS = require('uWebSockets.js');
+  const expressify = require('uwebsockets-express').default;
+  const uwsApp = uWS.App();
+  app = expressify(uwsApp);
+} else {
+  app = express();
+}
+
 // Middleware stack
 app.use(helmet());
 app.use(cors());
@@ -423,10 +432,11 @@ app.use((req, res) => {
 });
 
 // Start server
-const server = app.listen(PORT, (err) => {
-  if (err) {
-    console.error(`Error starting server: ${err.message}`)
-    process.exit(1)
+app.listen(PORT, (token) => {
+  // uwebsockets-express passes a token, express passes nothing or an error
+  if (process.env.USE_UWS && !token) {
+    console.error(`Error starting server on port ${PORT}`);
+    process.exit(1);
   }
   console.log(`Todo API server listening on port ${PORT}`);
   console.log(`PID: ${process.pid}`);
@@ -434,12 +444,4 @@ const server = app.listen(PORT, (err) => {
   console.log(`startup: ${process.hrtime(start)}`);
 });
 
-// Graceful shutdown
-process.on('SIGTERM', () => {
-  console.log('SIGTERM signal received: closing HTTP server');
-  server.close(() => {
-    console.log('HTTP server closed');
-  });
-});
-
 module.exports = app;