diff --git a/package.json b/package.json
index d44f2c4378c3..1be347032af0 100644
--- a/package.json
+++ b/package.json
@@ -180,7 +180,7 @@
     "terser": "^5.18.2",
     "testdouble": "^3.18.0",
     "typed-query-selector": "^2.11.2",
-    "typescript": "5.5.3",
+    "typescript": "5.8.2",
     "wait-for-expect": "^3.0.2",
     "webtreemap-cdt": "^3.2.1"
   },
diff --git a/types/internal/node.d.ts b/types/internal/node.d.ts
index 71bd04f7b393..7925668b6a72 100644
--- a/types/internal/node.d.ts
+++ b/types/internal/node.d.ts
@@ -30,22 +30,6 @@ declare global {
     /** Injected into the page when the `--debug` flag is used. */
     continueLighthouseRun(): void;
   }
-
-  // `fetchPriority` not defined in tsc as of 4.9.4.
-  interface HTMLImageElement {
-    /**
-     * Sets the priority for fetches initiated by the element.
-     * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-fetchpriority
-     */
-    fetchPriority: string;
-  }
-  interface HTMLLinkElement {
-    /**
-     * Sets the priority for fetches initiated by the element.
-     * @see https://html.spec.whatwg.org/multipage/semantics.html#dom-link-fetchpriority
-     */
-    fetchPriority: string;
-  }
 }
 
 export {};
diff --git a/yarn.lock b/yarn.lock
index 38cd664ef023..4a9127285523 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1479,11 +1479,11 @@
   integrity sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==
 
 "@types/node@*", "@types/node@>=12.12.47", "@types/node@>=13.7.0":
-  version "18.19.39"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-18.19.39.tgz#c316340a5b4adca3aee9dcbf05de385978590593"
-  integrity sha512-nPwTRDKUctxw3di5b4TfT3I0sWDiWoPQCZjXhvdkINntwr8lcoVCKsTgnXeRubKIlfnV+eN/HYk6Jb40tbcEAQ==
+  version "22.13.14"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-22.13.14.tgz#70d84ec91013dcd2ba2de35532a5a14c2b4cc912"
+  integrity sha512-Zs/Ollc1SJ8nKUAgc7ivOEdIBM8JAKgrqqUYi2J997JuKO7/tpQC+WCetQ1sypiKCQWHdvdg9wBNpUPEWZae7w==
   dependencies:
-    undici-types "~5.26.4"
+    undici-types "~6.20.0"
 
 "@types/node@^11.10.4":
   version "11.15.54"
@@ -7244,10 +7244,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@5.5.3:
-  version "5.5.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.5.3.tgz#e1b0a3c394190838a0b168e771b0ad56a0af0faa"
-  integrity sha512-/hreyEujaB0w76zKo6717l3L0o/qEUtRgdvUBvlkhoWeOVMjMuHNHk0BRBzikzuGDqNmPQbg5ifMEqsHLiIUcQ==
+typescript@5.8.2:
+  version "5.8.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.8.2.tgz#8170b3702f74b79db2e5a96207c15e65807999e4"
+  integrity sha512-aJn6wq13/afZp/jT9QZmwEjDqqvSGp1VT5GVg+f/t6/oVyrgXM6BY1h9BRh/O5p3PlUPAe+WuiEZOmb/49RqoQ==
 
 uglify-js@^3.1.4:
   version "3.14.4"
@@ -7264,10 +7264,10 @@ unbox-primitive@^1.0.1:
     has-symbols "^1.0.2"
     which-boxed-primitive "^1.0.2"
 
-undici-types@~5.26.4:
-  version "5.26.5"
-  resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-5.26.5.tgz#bcd539893d00b56e964fd2657a4866b221a65617"
-  integrity sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==
+undici-types@~6.20.0:
+  version "6.20.0"
+  resolved "https://registry.yarnpkg.com/undici-types/-/undici-types-6.20.0.tgz#8171bf22c1f588d1554d55bf204bc624af388433"
+  integrity sha512-Ny6QZ2Nju20vw1SRHe3d9jVu6gJ+4e3+MMpqu7pqE5HT6WsTSlce++GQmK5UXS8mzV8DSYHrQH+Xrf2jVcuKNg==
 
 union-value@^1.0.0:
   version "1.0.1"