diff --git a/.changeset/fair-toes-provide.md b/.changeset/fair-toes-provide.md
new file mode 100644
index 000000000..063a5bf81
--- /dev/null
+++ b/.changeset/fair-toes-provide.md
@@ -0,0 +1,12 @@
+---
+'@web/dev-server-import-maps': patch
+'@web/dev-server-esbuild': patch
+'@web/rollup-plugin-html': patch
+'@web/dev-server-legacy': patch
+'@web/dev-server-rollup': patch
+'@web/polyfills-loader': patch
+'@web/dev-server-core': patch
+'@web/parse5-utils': patch
+---
+
+Upgraded parse5 and removed external parse5/types dependency.
diff --git a/package-lock.json b/package-lock.json
index b0ffe701d..13fb6adb1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,7 +46,7 @@
         "rollup": "^4.4.0",
         "ts-node": "^10.4.0",
         "typescript": "~5.0.4",
-        "wireit": "^0.10.0"
+        "wireit": "^0.14.12"
       },
       "engines": {
         "node": ">=18.0.0"
@@ -34954,9 +34954,9 @@
       }
     },
     "node_modules/wireit": {
-      "version": "0.10.0",
-      "resolved": "https://registry.npmjs.org/wireit/-/wireit-0.10.0.tgz",
-      "integrity": "sha512-4TX6V9D/2iXUBzdqQaUG+cRePle0mDx1Q7x4Ka2cA8lgp1+ZBhrOTiLsXYRl2roQEldEFgQ2Ff1W8YgyNWAa6w==",
+      "version": "0.14.12",
+      "resolved": "https://registry.npmjs.org/wireit/-/wireit-0.14.12.tgz",
+      "integrity": "sha512-gNSd+nZmMo6cuICezYXRIayu6TSOeCSCDzjSF0q6g8FKDsRbdqrONrSZYzdk/uBISmRcv4vZtsno6GyGvdXwGA==",
       "dev": true,
       "license": "Apache-2.0",
       "workspaces": [
@@ -34964,7 +34964,7 @@
         "website"
       ],
       "dependencies": {
-        "braces": "^3.0.2",
+        "brace-expansion": "^4.0.0",
         "chokidar": "^3.5.3",
         "fast-glob": "^3.2.11",
         "jsonc-parser": "^3.0.0",
@@ -34974,7 +34974,30 @@
         "wireit": "bin/wireit.js"
       },
       "engines": {
-        "node": ">=14.14.0"
+        "node": ">=18.0.0"
+      }
+    },
+    "node_modules/wireit/node_modules/balanced-match": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-3.0.1.tgz",
+      "integrity": "sha512-vjtV3hiLqYDNRoiAv0zC4QaGAMPomEoq83PRmYIofPswwZurCeWR5LByXm7SyoL0Zh5+2z0+HC7jG8gSZJUh0w==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 16"
+      }
+    },
+    "node_modules/wireit/node_modules/brace-expansion": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-4.0.0.tgz",
+      "integrity": "sha512-l/mOwLWs7BQIgOKrL46dIAbyCKvPV7YJPDspkuc88rHsZRlg3hptUGdU7Trv0VFP4d3xnSGBQrKu5ZvGB7UeIw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
       }
     },
     "node_modules/with": {
@@ -36267,7 +36290,7 @@
         "koa-static": "^5.0.0",
         "lru-cache": "^8.0.4",
         "mime-types": "^2.1.27",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "picomatch": "^2.2.2",
         "ws": "^7.5.10"
       },
@@ -36275,7 +36298,6 @@
         "@types/clone": "^2.1.0",
         "@types/koa-etag": "^3.0.0",
         "@types/koa-static": "^4.0.1",
-        "@types/parse5": "^6.0.1",
         "abort-controller": "^3.0.0",
         "express": "^4.21.2",
         "nanoid": "^3.1.25",
@@ -36300,6 +36322,30 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "packages/dev-server-core/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/dev-server-core/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/dev-server-core/node_modules/readdirp": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.0.1.tgz",
@@ -36321,7 +36367,7 @@
         "@mdn/browser-compat-data": "^4.0.0",
         "@web/dev-server-core": "^0.7.4",
         "esbuild": "^0.25.0",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "ua-parser-js": "^1.0.33"
       },
       "devDependencies": {
@@ -36334,6 +36380,30 @@
         "node": ">=18.0.0"
       }
     },
+    "packages/dev-server-esbuild/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/dev-server-esbuild/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/dev-server-hmr": {
       "name": "@web/dev-server-hmr",
       "version": "0.4.1",
@@ -36355,10 +36425,9 @@
       "license": "MIT",
       "dependencies": {
         "@import-maps/resolve": "^1.0.1",
-        "@types/parse5": "^6.0.1",
         "@web/dev-server-core": "^0.7.2",
         "@web/parse5-utils": "^2.1.0",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "picomatch": "^2.2.2"
       },
       "devDependencies": {
@@ -36368,6 +36437,30 @@
         "node": ">=18.0.0"
       }
     },
+    "packages/dev-server-import-maps/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/dev-server-import-maps/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/dev-server-legacy": {
       "name": "@web/dev-server-legacy",
       "version": "2.1.1",
@@ -36387,7 +36480,7 @@
         "browserslist": "^4.16.0",
         "browserslist-useragent": "^4.0.0",
         "caniuse-api": "^3.0.0",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "valid-url": "^1.0.9"
       },
       "devDependencies": {
@@ -36400,6 +36493,30 @@
         "node": ">=18.0.0"
       }
     },
+    "packages/dev-server-legacy/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/dev-server-legacy/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/dev-server-polyfill": {
       "name": "@web/dev-server-polyfill",
       "version": "1.0.6",
@@ -36420,7 +36537,7 @@
         "@rollup/plugin-node-resolve": "^15.0.1",
         "@web/dev-server-core": "^0.7.2",
         "nanocolors": "^0.2.1",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "rollup": "^4.4.0",
         "whatwg-url": "^14.0.0"
       },
@@ -36430,7 +36547,6 @@
         "@rollup/plugin-babel": "^6.0.4",
         "@rollup/plugin-commonjs": "25.0.7",
         "@rollup/plugin-replace": "^5.0.5",
-        "@types/parse5": "^6.0.1",
         "@types/whatwg-url": "^11.0.0",
         "@web/test-runner-chrome": "^0.18.0",
         "@web/test-runner-core": "^0.13.0",
@@ -36535,6 +36651,30 @@
         }
       }
     },
+    "packages/dev-server-rollup/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/dev-server-rollup/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/dev-server-rollup/node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -36935,8 +37075,7 @@
       "version": "2.1.0",
       "license": "MIT",
       "dependencies": {
-        "@types/parse5": "^6.0.1",
-        "parse5": "^6.0.1"
+        "parse5": "^7.3.0"
       },
       "devDependencies": {
         "@types/html-minifier-terser": "^7.0.0"
@@ -36945,6 +37084,30 @@
         "node": ">=18.0.0"
       }
     },
+    "packages/parse5-utils/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/parse5-utils/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/polyfills-loader": {
       "name": "@web/polyfills-loader",
       "version": "2.3.1",
@@ -36961,7 +37124,7 @@
         "dynamic-import-polyfill": "^0.1.1",
         "es-module-shims": "^1.4.1",
         "intersection-observer": "^0.12.0",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "regenerator-runtime": "^0.14.0",
         "resize-observer-polyfill": "^1.5.1",
         "shady-css-scoped-element": "^0.0.2",
@@ -36972,7 +37135,6 @@
       },
       "devDependencies": {
         "@types/babel__core": "^7.1.12",
-        "@types/parse5": "^6.0.1",
         "@types/valid-url": "^1.0.3"
       },
       "engines": {
@@ -36984,6 +37146,30 @@
       "resolved": "https://registry.npmjs.org/@webcomponents/scoped-custom-element-registry/-/scoped-custom-element-registry-0.0.10.tgz",
       "integrity": "sha512-wP4LF28aysE2Pq3NQRNQxko7Q0vOOwcoOSMg8FFI4S6z76UuXkYIc5ndC31dJMwso1/vSteL75LW2CEKedAJbA=="
     },
+    "packages/polyfills-loader/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
+    "packages/polyfills-loader/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/rollup-plugin-copy": {
       "name": "@web/rollup-plugin-copy",
       "version": "0.5.1",
@@ -37060,7 +37246,7 @@
         "glob": "^10.0.0",
         "html-minifier-terser": "^7.1.0",
         "lightningcss": "^1.24.0",
-        "parse5": "^6.0.1",
+        "parse5": "^7.3.0",
         "picomatch": "^2.2.2"
       },
       "devDependencies": {
@@ -37080,6 +37266,18 @@
         "balanced-match": "^1.0.0"
       }
     },
+    "packages/rollup-plugin-html/node_modules/entities": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-6.0.0.tgz",
+      "integrity": "sha512-aKstq2TDOndCn4diEyp9Uq/Flu2i1GlLkc6XIDQSDMuaFE3OPW5OphLCyQ5SpSJZTb4reN+kTcYru5yIfXoRPw==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=0.12"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "packages/rollup-plugin-html/node_modules/glob": {
       "version": "10.3.10",
       "resolved": "https://registry.npmjs.org/glob/-/glob-10.3.10.tgz",
@@ -37115,6 +37313,18 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "packages/rollup-plugin-html/node_modules/parse5": {
+      "version": "7.3.0",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
+      "integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^6.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "packages/rollup-plugin-import-meta-assets": {
       "name": "@web/rollup-plugin-import-meta-assets",
       "version": "2.2.1",
@@ -38679,13 +38889,13 @@
     },
     "packages/test-runner": {
       "name": "@web/test-runner",
-      "version": "0.20.0",
+      "version": "0.20.1",
       "license": "MIT",
       "dependencies": {
         "@web/browser-logs": "^0.4.0",
         "@web/config-loader": "^0.3.0",
         "@web/dev-server": "^0.4.0",
-        "@web/test-runner-chrome": "^0.18.0",
+        "@web/test-runner-chrome": "^0.18.1",
         "@web/test-runner-commands": "^0.9.0",
         "@web/test-runner-core": "^0.13.0",
         "@web/test-runner-mocha": "^0.9.0",
@@ -38766,7 +38976,7 @@
     },
     "packages/test-runner-chrome": {
       "name": "@web/test-runner-chrome",
-      "version": "0.18.0",
+      "version": "0.18.1",
       "license": "MIT",
       "dependencies": {
         "@web/test-runner-core": "^0.13.0",
diff --git a/package.json b/package.json
index 59bb00b9c..e202cde3e 100644
--- a/package.json
+++ b/package.json
@@ -77,7 +77,7 @@
     "rollup": "^4.4.0",
     "ts-node": "^10.4.0",
     "typescript": "~5.0.4",
-    "wireit": "^0.10.0"
+    "wireit": "^0.14.12"
   },
   "eslintConfig": {
     "parser": "@typescript-eslint/parser",
diff --git a/packages/dev-server-core/package.json b/packages/dev-server-core/package.json
index defcaf24f..6050d5ae7 100644
--- a/packages/dev-server-core/package.json
+++ b/packages/dev-server-core/package.json
@@ -73,7 +73,7 @@
     "koa-static": "^5.0.0",
     "lru-cache": "^8.0.4",
     "mime-types": "^2.1.27",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "picomatch": "^2.2.2",
     "ws": "^7.5.10"
   },
@@ -81,7 +81,6 @@
     "@types/clone": "^2.1.0",
     "@types/koa-etag": "^3.0.0",
     "@types/koa-static": "^4.0.1",
-    "@types/parse5": "^6.0.1",
     "abort-controller": "^3.0.0",
     "express": "^4.21.2",
     "nanoid": "^3.1.25",
diff --git a/packages/dev-server-esbuild/package.json b/packages/dev-server-esbuild/package.json
index bc24c9efa..aaf6d661e 100644
--- a/packages/dev-server-esbuild/package.json
+++ b/packages/dev-server-esbuild/package.json
@@ -54,7 +54,7 @@
     "@mdn/browser-compat-data": "^4.0.0",
     "@web/dev-server-core": "^0.7.4",
     "esbuild": "^0.25.0",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "ua-parser-js": "^1.0.33"
   },
   "devDependencies": {
diff --git a/packages/dev-server-import-maps/package.json b/packages/dev-server-import-maps/package.json
index 0fd9123ba..4e84fd123 100644
--- a/packages/dev-server-import-maps/package.json
+++ b/packages/dev-server-import-maps/package.json
@@ -51,10 +51,9 @@
   ],
   "dependencies": {
     "@import-maps/resolve": "^1.0.1",
-    "@types/parse5": "^6.0.1",
     "@web/dev-server-core": "^0.7.2",
     "@web/parse5-utils": "^2.1.0",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "picomatch": "^2.2.2"
   },
   "devDependencies": {
diff --git a/packages/dev-server-import-maps/src/importMapsPlugin.ts b/packages/dev-server-import-maps/src/importMapsPlugin.ts
index 11376b8f8..d3f0704fe 100644
--- a/packages/dev-server-import-maps/src/importMapsPlugin.ts
+++ b/packages/dev-server-import-maps/src/importMapsPlugin.ts
@@ -6,7 +6,7 @@ import {
   resolve,
 } from '@import-maps/resolve';
 import { getHtmlPath } from '@web/dev-server-core';
-import { parse as parseHtml, serialize as serializeHtml, Element as ElementAst } from 'parse5';
+import { parse as parseHtml, serialize as serializeHtml, type DefaultTreeAdapterMap } from 'parse5';
 import path from 'path';
 
 import {
@@ -32,6 +32,8 @@ import {
   setTextContent,
 } from '@web/parse5-utils';
 
+type ElementAst = DefaultTreeAdapterMap['element'];
+
 export interface ImportMapData {
   htmlPath: string;
   importMap: ParsedImportMap;
diff --git a/packages/dev-server-import-maps/src/utils.ts b/packages/dev-server-import-maps/src/utils.ts
index f86991aa6..2e7ae3aef 100644
--- a/packages/dev-server-import-maps/src/utils.ts
+++ b/packages/dev-server-import-maps/src/utils.ts
@@ -1,11 +1,13 @@
 import picoMatch from 'picomatch';
 import { Context, getHtmlPath } from '@web/dev-server-core';
-import { Element as ElementAst } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import { getAttribute } from '@web/parse5-utils';
 import { ParsedImportMap } from '@import-maps/resolve';
 
 import { NormalizedInjectSetting, InjectSetting } from './importMapsPlugin.js';
 
+type ElementAst = DefaultTreeAdapterMap['element'];
+
 export const IMPORT_MAP_PARAM = 'wds-import-map';
 
 function createMatchers(inject: InjectSetting) {
diff --git a/packages/dev-server-legacy/package.json b/packages/dev-server-legacy/package.json
index 2edb604c8..17a2d2299 100644
--- a/packages/dev-server-legacy/package.json
+++ b/packages/dev-server-legacy/package.json
@@ -64,7 +64,7 @@
     "browserslist": "^4.16.0",
     "browserslist-useragent": "^4.0.0",
     "caniuse-api": "^3.0.0",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "valid-url": "^1.0.9"
   },
   "devDependencies": {
diff --git a/packages/dev-server-legacy/src/findJsScripts.ts b/packages/dev-server-legacy/src/findJsScripts.ts
index 02a30577a..cd4bdbecc 100644
--- a/packages/dev-server-legacy/src/findJsScripts.ts
+++ b/packages/dev-server-legacy/src/findJsScripts.ts
@@ -1,7 +1,10 @@
 import { isUri } from 'valid-url';
-import { Document as DocumentAst, Node as NodeAst } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import { queryAll, predicates, getAttribute, hasAttribute } from '@web/dev-server-core/dist/dom5';
 
+type DocumentAst = DefaultTreeAdapterMap['document'];
+type NodeAst = DefaultTreeAdapterMap['node'];
+
 function isDeferred(script: NodeAst) {
   return getAttribute(script, 'type') === 'module' || hasAttribute(script, 'defer');
 }
diff --git a/packages/dev-server-legacy/src/injectPolyfillsLoader.ts b/packages/dev-server-legacy/src/injectPolyfillsLoader.ts
index 58539f3d8..f446b9346 100644
--- a/packages/dev-server-legacy/src/injectPolyfillsLoader.ts
+++ b/packages/dev-server-legacy/src/injectPolyfillsLoader.ts
@@ -1,6 +1,6 @@
 import { Context } from '@web/dev-server-core';
 import { getAttribute, getTextContent, remove } from '@web/dev-server-core/dist/dom5';
-import { parse, serialize, Document as DocumentAst, Node as NodeAst } from 'parse5';
+import { parse, serialize, type DefaultTreeAdapterMap } from 'parse5';
 import {
   injectPolyfillsLoader as originalInjectPolyfillsLoader,
   PolyfillsConfig,
@@ -12,6 +12,9 @@ import {
 import { PARAM_TRANSFORM_SYSTEMJS } from './constants.js';
 import { findJsScripts } from './findJsScripts.js';
 
+type NodeAst = DefaultTreeAdapterMap['node'];
+type DocumentAst = DefaultTreeAdapterMap['document'];
+
 function findScripts(indexUrl: string, documentAst: DocumentAst) {
   const scriptNodes = findJsScripts(documentAst);
 
diff --git a/packages/dev-server-rollup/package.json b/packages/dev-server-rollup/package.json
index 2d6ae4fa3..41548295f 100644
--- a/packages/dev-server-rollup/package.json
+++ b/packages/dev-server-rollup/package.json
@@ -51,7 +51,7 @@
     "@rollup/plugin-node-resolve": "^15.0.1",
     "@web/dev-server-core": "^0.7.2",
     "nanocolors": "^0.2.1",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "rollup": "^4.4.0",
     "whatwg-url": "^14.0.0"
   },
@@ -61,7 +61,6 @@
     "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-commonjs": "25.0.7",
     "@rollup/plugin-replace": "^5.0.5",
-    "@types/parse5": "^6.0.1",
     "@types/whatwg-url": "^11.0.0",
     "@web/test-runner-chrome": "^0.18.0",
     "@web/test-runner-core": "^0.13.0",
diff --git a/packages/parse5-utils/package.json b/packages/parse5-utils/package.json
index 287f3adf7..e62571856 100644
--- a/packages/parse5-utils/package.json
+++ b/packages/parse5-utils/package.json
@@ -42,8 +42,7 @@
     "utils"
   ],
   "dependencies": {
-    "@types/parse5": "^6.0.1",
-    "parse5": "^6.0.1"
+    "parse5": "^7.3.0"
   },
   "devDependencies": {
     "@types/html-minifier-terser": "^7.0.0"
diff --git a/packages/parse5-utils/src/index.js b/packages/parse5-utils/src/index.js
index c48fba1fc..22862ad54 100644
--- a/packages/parse5-utils/src/index.js
+++ b/packages/parse5-utils/src/index.js
@@ -1,14 +1,16 @@
-/** @typedef {import('parse5').TreeAdapter} TreeAdapter */
-/** @typedef {import('parse5').Element} Element */
-/** @typedef {import('parse5').Attribute} Attribute */
-/** @typedef {import('parse5').Node} Node */
-/** @typedef {import('parse5').ParentNode} ParentNode */
-/** @typedef {import('parse5').ChildNode} ChildNode */
-/** @typedef {import('parse5').CommentNode} CommentNode */
-/** @typedef {import('parse5').TextNode} TextNode */
+/** @typedef {import('parse5').DefaultTreeAdapterMap} DefaultTreeAdapterMap */
+/** @typedef {DefaultTreeAdapterMap['element']} Element */
+/** @typedef {DefaultTreeAdapterMap['template']} Template */
+/** @typedef {import('parse5').Token.Attribute} Attribute */
+/** @typedef {DefaultTreeAdapterMap['node']} Node */
+/** @typedef {DefaultTreeAdapterMap['parentNode']} ParentNode */
+/** @typedef {DefaultTreeAdapterMap['childNode']} ChildNode */
+/** @typedef {DefaultTreeAdapterMap['commentNode']} CommentNode */
+/** @typedef {DefaultTreeAdapterMap['textNode']} TextNode */
+/** @typedef {import('parse5').html.NS} NS */
 
 const parse5 = require('parse5');
-const adapter = require('parse5/lib/tree-adapters/default');
+const adapter = parse5.defaultTreeAdapter;
 
 const DEFAULT_NAMESPACE = 'http://www.w3.org/1999/xhtml';
 const REGEXP_IS_HTML_DOCUMENT = /^\s*<(!doctype|html|head|body)\b/i;
@@ -23,7 +25,7 @@ const REGEXP_IS_HTML_DOCUMENT = /^\s*<(!doctype|html|head|body)\b/i;
  */
 function createElement(tagName, attrs = {}, namespaceURI = DEFAULT_NAMESPACE) {
   const attrsArray = Object.entries(attrs).map(([name, value]) => ({ name, value }));
-  return adapter.createElement(tagName, namespaceURI, attrsArray);
+  return adapter.createElement(tagName, /** @type {NS} */ (namespaceURI), attrsArray);
 }
 
 /**
@@ -220,7 +222,7 @@ function findNodes(nodes, test) {
     let children = [];
 
     if (adapter.isElementNode(node) && adapter.getTagName(node) === 'template') {
-      const content = adapter.getTemplateContent(node);
+      const content = adapter.getTemplateContent(/** @type {Template} */ (node));
       if (content) {
         children = adapter.getChildNodes(content);
       }
diff --git a/packages/polyfills-loader/package.json b/packages/polyfills-loader/package.json
index 040b21f07..226cd98dd 100644
--- a/packages/polyfills-loader/package.json
+++ b/packages/polyfills-loader/package.json
@@ -57,7 +57,7 @@
     "dynamic-import-polyfill": "^0.1.1",
     "es-module-shims": "^1.4.1",
     "intersection-observer": "^0.12.0",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "regenerator-runtime": "^0.14.0",
     "resize-observer-polyfill": "^1.5.1",
     "shady-css-scoped-element": "^0.0.2",
@@ -68,7 +68,6 @@
   },
   "devDependencies": {
     "@types/babel__core": "^7.1.12",
-    "@types/parse5": "^6.0.1",
     "@types/valid-url": "^1.0.3"
   }
 }
diff --git a/packages/polyfills-loader/src/injectPolyfillsLoader.ts b/packages/polyfills-loader/src/injectPolyfillsLoader.ts
index 3fa48be47..35864de99 100644
--- a/packages/polyfills-loader/src/injectPolyfillsLoader.ts
+++ b/packages/polyfills-loader/src/injectPolyfillsLoader.ts
@@ -1,4 +1,4 @@
-import { Document, Node, ParentNode, parse, serialize } from 'parse5';
+import { type DefaultTreeAdapterMap, parse, serialize } from 'parse5';
 import {
   findElements,
   getAttribute,
@@ -16,7 +16,11 @@ import { PolyfillsLoaderConfig, PolyfillsLoader, GeneratedFile } from './types.j
 import { createPolyfillsLoader } from './createPolyfillsLoader.js';
 import { hasFileOfType, fileTypes } from './utils.js';
 
-function injectImportMapPolyfill(headAst: ParentNode, originalScript: Node, type: string) {
+type Document = DefaultTreeAdapterMap['document'];
+type ParentNode = DefaultTreeAdapterMap['parentNode'];
+type ChildNode = DefaultTreeAdapterMap['childNode'];
+
+function injectImportMapPolyfill(headAst: ParentNode, originalScript: ChildNode, type: string) {
   const systemJsScript = createScript({ type }, getTextContent(originalScript));
   insertBefore(headAst, systemJsScript, originalScript);
 }
@@ -24,8 +28,8 @@ function injectImportMapPolyfill(headAst: ParentNode, originalScript: Node, type
 function findImportMapScripts(document: Document) {
   const scripts = findElements(document, script => getAttribute(script, 'type') === 'importmap');
 
-  const inline: Node[] = [];
-  const external: Node[] = [];
+  const inline: ChildNode[] = [];
+  const external: ChildNode[] = [];
   for (const script of scripts) {
     if (getAttribute(script, 'src')) {
       external.push(script);
diff --git a/packages/polyfills-loader/src/types.ts b/packages/polyfills-loader/src/types.ts
index dcec0f989..56c888ce9 100644
--- a/packages/polyfills-loader/src/types.ts
+++ b/packages/polyfills-loader/src/types.ts
@@ -1,4 +1,6 @@
-import { Attribute } from 'parse5';
+import type { Token } from 'parse5';
+
+type Attribute = Token.Attribute;
 
 export interface PolyfillsLoaderConfig {
   // files to load on modern browsers. loaded when there are no
diff --git a/packages/polyfills-loader/src/utils.ts b/packages/polyfills-loader/src/utils.ts
index 5bc75af92..4b40e3cc3 100644
--- a/packages/polyfills-loader/src/utils.ts
+++ b/packages/polyfills-loader/src/utils.ts
@@ -1,8 +1,10 @@
-import { Element } from 'parse5';
+import { DefaultTreeAdapterMap } from 'parse5';
 import { getAttribute } from '@web/parse5-utils';
 import crypto from 'crypto';
 import { FileType, PolyfillsLoaderConfig } from './types.js';
 
+type Element = DefaultTreeAdapterMap['element'];
+
 export const noModuleSupportTest = "!('noModule' in HTMLScriptElement.prototype)";
 
 export const fileTypes: Record<'SCRIPT' | 'MODULE' | 'MODULESHIM' | 'SYSTEMJS', FileType> = {
diff --git a/packages/rollup-plugin-html/package.json b/packages/rollup-plugin-html/package.json
index d67042312..1a3b5cd0b 100644
--- a/packages/rollup-plugin-html/package.json
+++ b/packages/rollup-plugin-html/package.json
@@ -48,7 +48,7 @@
     "glob": "^10.0.0",
     "html-minifier-terser": "^7.1.0",
     "lightningcss": "^1.24.0",
-    "parse5": "^6.0.1",
+    "parse5": "^7.3.0",
     "picomatch": "^2.2.2"
   },
   "devDependencies": {
diff --git a/packages/rollup-plugin-html/src/RollupPluginHTMLOptions.ts b/packages/rollup-plugin-html/src/RollupPluginHTMLOptions.ts
index c65198af3..82476c083 100644
--- a/packages/rollup-plugin-html/src/RollupPluginHTMLOptions.ts
+++ b/packages/rollup-plugin-html/src/RollupPluginHTMLOptions.ts
@@ -1,5 +1,7 @@
 import { OutputChunk, OutputOptions, OutputBundle } from 'rollup';
-import { Attribute } from 'parse5';
+import type { Token } from 'parse5';
+
+type Attribute = Token.Attribute;
 
 export interface InputHTMLOptions {
   /** The html source code. If set, overwrites path. */
diff --git a/packages/rollup-plugin-html/src/assets/utils.ts b/packages/rollup-plugin-html/src/assets/utils.ts
index 5af29a52f..dff1c2ed2 100644
--- a/packages/rollup-plugin-html/src/assets/utils.ts
+++ b/packages/rollup-plugin-html/src/assets/utils.ts
@@ -1,10 +1,13 @@
-import { Document, Element } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import path from 'path';
 import picomatch from 'picomatch';
 import { findElements, getTagName, getAttribute } from '@web/parse5-utils';
 import { createError } from '../utils.js';
 import { serialize } from 'v8';
 
+type Document = DefaultTreeAdapterMap['document'];
+type Element = DefaultTreeAdapterMap['element'];
+
 const hashedLinkRels = ['stylesheet'];
 const linkRels = [...hashedLinkRels, 'icon', 'manifest', 'apple-touch-icon', 'mask-icon'];
 
diff --git a/packages/rollup-plugin-html/src/input/extract/extractAssets.ts b/packages/rollup-plugin-html/src/input/extract/extractAssets.ts
index b2ae8b8fc..98669ea74 100644
--- a/packages/rollup-plugin-html/src/input/extract/extractAssets.ts
+++ b/packages/rollup-plugin-html/src/input/extract/extractAssets.ts
@@ -1,4 +1,4 @@
-import { Document, serialize } from 'parse5';
+import { type DefaultTreeAdapterMap, serialize } from 'parse5';
 import fs from 'fs';
 import path from 'path';
 import { InputAsset } from '../InputData.js';
@@ -10,6 +10,8 @@ import {
   createAssetPicomatchMatcher,
 } from '../../assets/utils.js';
 
+type Document = DefaultTreeAdapterMap['document'];
+
 export interface ExtractAssetsParams {
   document: Document;
   htmlFilePath: string;
diff --git a/packages/rollup-plugin-html/src/input/extract/extractModules.ts b/packages/rollup-plugin-html/src/input/extract/extractModules.ts
index aec82e009..333fc5dbb 100644
--- a/packages/rollup-plugin-html/src/input/extract/extractModules.ts
+++ b/packages/rollup-plugin-html/src/input/extract/extractModules.ts
@@ -1,11 +1,14 @@
 import { findElements, getAttribute, getTagName, getTextContent, remove } from '@web/parse5-utils';
-import { Document, Attribute } from 'parse5';
+import type { DefaultTreeAdapterMap, Token } from 'parse5';
 import path from 'path';
 import crypto from 'crypto';
 import { resolveAssetFilePath } from '../../assets/utils.js';
 import { getAttributes } from '@web/parse5-utils';
 import { ScriptModuleTag } from '../../RollupPluginHTMLOptions.js';
 
+type Document = DefaultTreeAdapterMap['document'];
+type Attribute = Token.Attribute;
+
 export interface ExtractModulesParams {
   document: Document;
   htmlDir: string;
diff --git a/packages/rollup-plugin-html/src/output/getEntrypointBundles.ts b/packages/rollup-plugin-html/src/output/getEntrypointBundles.ts
index 12c1bbb5c..bc65736fe 100644
--- a/packages/rollup-plugin-html/src/output/getEntrypointBundles.ts
+++ b/packages/rollup-plugin-html/src/output/getEntrypointBundles.ts
@@ -1,4 +1,4 @@
-import { Attribute } from 'parse5';
+import type { Token } from 'parse5';
 import path from 'path';
 import { OutputChunk } from 'rollup';
 
@@ -11,6 +11,8 @@ import {
 import { createError, NOOP_IMPORT } from '../utils.js';
 import { toBrowserPath } from './utils.js';
 
+type Attribute = Token.Attribute;
+
 export interface CreateImportPathParams {
   publicPath?: string;
   outputDir: string;
diff --git a/packages/rollup-plugin-html/src/output/hashInlineScripts.ts b/packages/rollup-plugin-html/src/output/hashInlineScripts.ts
index 4e096eef2..f0db70dbb 100644
--- a/packages/rollup-plugin-html/src/output/hashInlineScripts.ts
+++ b/packages/rollup-plugin-html/src/output/hashInlineScripts.ts
@@ -1,4 +1,4 @@
-import { Document, Element, ParentNode } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import {
   findElement,
   findElements,
@@ -13,6 +13,10 @@ import {
 } from '@web/parse5-utils';
 import crypto from 'crypto';
 
+type Document = DefaultTreeAdapterMap['document'];
+type Element = DefaultTreeAdapterMap['element'];
+type ParentNode = DefaultTreeAdapterMap['parentNode'];
+
 function isMetaCSPTag(node: Element) {
   if (
     getTagName(node) === 'meta' &&
diff --git a/packages/rollup-plugin-html/src/output/injectAbsoluteBaseUrl.ts b/packages/rollup-plugin-html/src/output/injectAbsoluteBaseUrl.ts
index 9d4ec9cfd..0acfd5828 100644
--- a/packages/rollup-plugin-html/src/output/injectAbsoluteBaseUrl.ts
+++ b/packages/rollup-plugin-html/src/output/injectAbsoluteBaseUrl.ts
@@ -1,6 +1,9 @@
-import { Document, Element } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import { findElements, getTagName, getAttribute, setAttribute } from '@web/parse5-utils';
 
+type Element = DefaultTreeAdapterMap['element'];
+type Document = DefaultTreeAdapterMap['document'];
+
 function isAbsoluteableNode(node: Element) {
   const metaAttributes = ['og:url', 'og:image'];
   switch (getTagName(node)) {
diff --git a/packages/rollup-plugin-html/src/output/injectBundles.ts b/packages/rollup-plugin-html/src/output/injectBundles.ts
index a624297bb..18c3abbda 100644
--- a/packages/rollup-plugin-html/src/output/injectBundles.ts
+++ b/packages/rollup-plugin-html/src/output/injectBundles.ts
@@ -1,9 +1,12 @@
-import { Document, Attribute } from 'parse5';
+import { type DefaultTreeAdapterMap, Token } from 'parse5';
 import { createScript, findElement, getTagName, appendChild } from '@web/parse5-utils';
 
 import { EntrypointBundle } from '../RollupPluginHTMLOptions.js';
 import { createError } from '../utils.js';
 
+type Attribute = Token.Attribute;
+type Document = DefaultTreeAdapterMap['document'];
+
 export function createLoadScript(src: string, format: string, attributes?: Attribute[]) {
   const attributesObject: Record<string, string> = {};
   if (attributes) {
diff --git a/packages/rollup-plugin-html/src/output/injectServiceWorkerRegistration.ts b/packages/rollup-plugin-html/src/output/injectServiceWorkerRegistration.ts
index 5dcb22ebb..e32a2f4e6 100644
--- a/packages/rollup-plugin-html/src/output/injectServiceWorkerRegistration.ts
+++ b/packages/rollup-plugin-html/src/output/injectServiceWorkerRegistration.ts
@@ -1,5 +1,5 @@
 import path from 'path';
-import { Document } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import {
   findElement,
   getTagName,
@@ -8,6 +8,8 @@ import {
   setAttribute,
 } from '@web/parse5-utils';
 
+type Document = DefaultTreeAdapterMap['document'];
+
 export interface injectServiceWorkerRegistrationArgs {
   document: Document;
   serviceWorkerPath: string;
diff --git a/packages/rollup-plugin-html/src/output/injectedUpdatedAssetPaths.ts b/packages/rollup-plugin-html/src/output/injectedUpdatedAssetPaths.ts
index e5ba484ae..b90784c93 100644
--- a/packages/rollup-plugin-html/src/output/injectedUpdatedAssetPaths.ts
+++ b/packages/rollup-plugin-html/src/output/injectedUpdatedAssetPaths.ts
@@ -1,5 +1,5 @@
 import { getAttribute, setAttribute } from '@web/parse5-utils';
-import { Document } from 'parse5';
+import type { DefaultTreeAdapterMap } from 'parse5';
 import path from 'path';
 
 import {
@@ -15,6 +15,8 @@ import { createError } from '../utils.js';
 import { EmittedAssets } from './emitAssets.js';
 import { toBrowserPath } from './utils.js';
 
+type Document = DefaultTreeAdapterMap['document'];
+
 export interface InjectUpdatedAssetPathsArgs {
   document: Document;
   input: InputData;