diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index f330087..1d9d6e8 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -11,6 +11,17 @@ updates:
     groups:
       dev-dependencies:
         dependency-type: development
+    # Defer the Vitest 4 migration: @vitest/coverage-v8 v4 measures coverage
+    # differently and drops the suite below the 100%/90% per-file gate even with
+    # all tests passing. Stay on 2.x (and matching happy-dom) until that migration
+    # is done deliberately; minors/patches still flow.
+    ignore:
+      - dependency-name: "vitest"
+        update-types: ["version-update:semver-major"]
+      - dependency-name: "@vitest/coverage-v8"
+        update-types: ["version-update:semver-major"]
+      - dependency-name: "happy-dom"
+        update-types: ["version-update:semver-major"]
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
diff --git a/package.json b/package.json
index 486a719..ce56681 100644
--- a/package.json
+++ b/package.json
@@ -14,9 +14,9 @@
     "local": "node build/build.mjs && python3 build/local.py"
   },
   "devDependencies": {
-    "@playwright/test": "^1.48.0",
+    "@playwright/test": "^1.61.1",
     "@vitest/coverage-v8": "^2.1.8",
-    "esbuild": "^0.21.5",
+    "esbuild": "^0.28.1",
     "happy-dom": "^15.11.0",
     "vitest": "^2.1.8"
   },