diff --git a/package.json b/package.json
index a5b9beb32a3..a3cfeb8d4a8 100644
--- a/package.json
+++ b/package.json
@@ -405,6 +405,7 @@
     "@typescript/native-preview": "7.0.0-dev.20260312.1",
     "@vitest/coverage-v8": "^4.1.0",
     "jscpd": "4.0.8",
+    "jsdom": "^28.1.0",
     "lit": "^3.3.2",
     "oxfmt": "0.40.0",
     "oxlint": "^1.55.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b8448ab29a5..ac32d145c57 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -227,6 +227,9 @@ importers:
       jscpd:
         specifier: 4.0.8
         version: 4.0.8
+      jsdom:
+        specifier: ^28.1.0
+        version: 28.1.0(@noble/hashes@2.0.1)
       lit:
         specifier: ^3.3.2
         version: 3.3.2