diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 8d396de..d101376 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -12,19 +12,18 @@ updates:
       production:
         dependency-type: production
         update-types: [minor, patch]
+      # Before `development` so Vitest majors bump vitest and @vitest/* together.
+      vitest:
+        patterns: ["vitest", "@vitest/*"]
       development:
         dependency-type: development
         update-types: [minor, patch]
     ignore:
       # Pinned with PYODIDE_VERSION (runtime.ts, workerBase.ts) and index.html.
       - dependency-name: pyodide
-      # Vite 8 (Rolldown) and Vitest 5 (Node 22) need a coordinated migration.
+      # Vite 8 needs the Rolldown migration and @vitejs/plugin-react 6.
       - dependency-name: vite
         update-types: ["version-update:semver-major"]
-      - dependency-name: vitest
-        update-types: ["version-update:semver-major"]
-      - dependency-name: "@vitest/*"
-        update-types: ["version-update:semver-major"]
       - dependency-name: "@vitejs/plugin-react"
         update-types: ["version-update:semver-major"]
       # typescript-eslint caps its TypeScript peer range (<6.1.0 as of 8.71).
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 6107ad7..3a07382 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -23,7 +23,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - run: npm ci
diff --git a/.github/workflows/perf.yml b/.github/workflows/perf.yml
index eaca63f..32d3e6b 100644
--- a/.github/workflows/perf.yml
+++ b/.github/workflows/perf.yml
@@ -48,7 +48,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "24"
           cache: npm
 
       - name: Set up Python
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e77fb79..4f0ea47 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -80,7 +80,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - name: Install npm dependencies
@@ -114,7 +114,7 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 24
           cache: npm
 
       - name: Install dependencies
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 589d07e..95320fe 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -60,7 +60,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "24"
           cache: npm
 
       - name: Install npm dependencies
@@ -93,7 +93,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "24"
           cache: npm
 
       - name: Set up Python