diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 6ae5c909..f8542292 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -37,9 +37,12 @@ RUN apt-get update \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/*
 
-# node 22 to match CI: pnpm 11 requires >=22.13, and vitest 3 (via vite 7)
-# requires >=20.19, so the old node 16 here could run neither.
-RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash -
+# node 24 to match CI, and to satisfy the root package.json engines.node
+# floor (>=24) — pnpm warns "Unsupported engine" on anything below it. Only
+# the node major is shared with CI: the emsdk pin above is deliberately older
+# than the one tools/docker/Dockerfile and the build job use, so this image is
+# for editing and running the JS tooling, not for reproducing a CI dist.
+RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash -
 RUN apt-get install -y nodejs
 # Corepack reads the pinned pnpm version from the repo's package.json
 # "packageManager" field on first use, so there is nothing to pin here.
diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index e22971a4..ff0956a0 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -242,18 +242,18 @@ jobs:
           persist-credentials: false
       - uses: actions/setup-node@v4
         with:
-          # EXACT version, not the '22' range every other job uses. For a range,
+          # EXACT version, not the '24' range every other job uses. For a range,
           # setup-node takes any satisfying version already in the runner's tool
           # cache without checking the network — and on a self-hosted box that
-          # cache persists, so the bench would silently freeze on whichever 22.x
+          # cache persists, so the bench would silently freeze on whichever 24.x
           # landed there first and jump whenever the box is rebuilt. A V8 patch
           # bump shifts instruction counts the same way a different CPU does.
-          # 22.23.1 is what the current main baseline was measured on; changing
+          # 24.20.0 is what the current main baseline was measured on; changing
           # it is a deliberate re-seed event (see docs/ci/self-hosted-runner.md).
-          node-version: '22.23.1'
+          node-version: '24.20.0'
       # nashua has no package manager beyond npm: setup-node ships node + npm
       # only, and GitHub's hosted images are not what runs here. Corepack is
-      # bundled with node 22 and fetches over Node's own https, so it works
+      # still bundled with node 24 and fetches over Node's own https, so it works
       # where `npm i -g <pm>` is unreliable on this box — the runner's bundled
       # node has a corrupted npm ("Cannot find module '../lib/cli.js'"), which
       # is why OHIF's workflow also went the Corepack route here. `corepack
@@ -296,8 +296,10 @@ jobs:
           # pnpm-workspace.yaml is in the key because the lockfile does not
           # record nodeLinker/allowBuilds/linkWorkspacePackages — without it a
           # layout change hits the cache and the install step is skipped.
-          # Keep in step with the cache keys in pr-checks.yml.
-          key: pnpm-modules-node22-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
+          # Keep in step with the cache keys in pr-checks.yml — including the
+          # node major in the prefix, which is the only part of this key a
+          # node-only bump changes (see the build job's cache step there).
+          key: pnpm-modules-node24-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
       - name: Install dependencies
         if: steps.modules-cache.outputs.cache-hit != 'true'
         run: pnpm install --frozen-lockfile
diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index ae18d07f..83027bb1 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -196,12 +196,13 @@ jobs:
         # Shallow checkout: builds only need the working tree (full history
         # is only required by detect-changes for the merge-base diff).
       - uses: actions/setup-node@v4
-        # The emsdk image bundles node 20.18.0, which fails both pnpm 11's
-        # engine check (needs >=22.13) and vite 7's (via vitest 3). Put node 22
-        # on PATH for pnpm/webpack; emscripten is unaffected — emcc invokes the
-        # node binary pinned in its own .emscripten config, not the one on PATH.
+        # The emsdk image bundles node 20.18.0 — end of life since 2026-04-30,
+        # and it fails this repo's engines.node check (needs >=24) anyway. Put node
+        # 24 on PATH for pnpm/webpack; emscripten is unaffected — emcc invokes
+        # the node binary pinned in its own .emscripten config, not the one on
+        # PATH.
         with:
-          node-version: '22'
+          node-version: '24'
       - name: Provide pnpm via Corepack
         # `corepack prepare --activate` with no argument installs exactly the
         # version in the root package.json "packageManager" field, so CI and
@@ -244,6 +245,14 @@ jobs:
           #     stale cache entry. The root manifest also carries the
           #     packageManager pin, so a pnpm bump invalidates too.
           # Keep the same hashFiles(...) inputs in all four pnpm-modules keys.
+          #
+          # This job's prefix is `build` rather than `node<major>` because it
+          # installs inside the emsdk container; the other three install on
+          # ubuntu-latest under setup-node and carry the node major in the key
+          # so a node bump forces a fresh install instead of restoring a tree
+          # built against the previous V8/ABI. BUMP THAT DISCRIMINATOR WITH THE
+          # node-version PINS — bench.yml's key hashes only the lockfile and
+          # workspace config, so nothing else in a node-only bump invalidates it.
           key: pnpm-modules-build-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
       - name: Install dependencies
         if: steps.modules-cache.outputs.cache-hit != 'true'
@@ -282,7 +291,7 @@ jobs:
           persist-credentials: false
       - uses: actions/setup-node@v4
         with:
-          node-version: '22'
+          node-version: '24'
       - name: Provide pnpm via Corepack
         run: |
           corepack enable pnpm
@@ -316,7 +325,7 @@ jobs:
             packages/*/node_modules
           # Manifests + workspace config in the key — see the build job's cache
           # step for why the lockfile alone is not enough.
-          key: pnpm-modules-node22-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
+          key: pnpm-modules-node24-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
       - name: Install dependencies
         if: steps.modules-cache.outputs.cache-hit != 'true'
         run: pnpm install --frozen-lockfile
@@ -347,6 +356,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        # check.js needs no dependencies (fs/path/zlib only), so this is purely
+        # to stop the gate running on whatever node the runner image happens to
+        # ship — which drifts, and has been below this repo's engines.node floor.
+        with:
+          node-version: '24'
       - name: Download all built dists
         uses: actions/download-artifact@v4
         with:
@@ -370,7 +385,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '22'
+          node-version: '24'
       - name: Provide pnpm via Corepack
         run: |
           corepack enable pnpm
@@ -400,7 +415,7 @@ jobs:
             packages/*/node_modules
           # Manifests + workspace config in the key — see the build job's cache
           # step for why the lockfile alone is not enough.
-          key: pnpm-modules-node22-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
+          key: pnpm-modules-node24-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
       - name: Install dependencies
         if: steps.modules-cache.outputs.cache-hit != 'true'
         run: pnpm install --frozen-lockfile
@@ -450,7 +465,7 @@ jobs:
           # between patch releases move the numbers, and walltime is if anything
           # more sensitive than instruction counts. Keep this in step with the
           # codspeed-bench pin so the two instruments stay comparable.
-          node-version: '22.23.1'
+          node-version: '24.20.0'
       - name: Provide pnpm via Corepack
         run: |
           corepack enable pnpm
@@ -483,7 +498,7 @@ jobs:
           # (esbuild/rollup) and break vitest.
           # Manifests + workspace config in the key — see the build job's cache
           # step for why the lockfile alone is not enough.
-          key: pnpm-modules-node22-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
+          key: pnpm-modules-node24-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('package.json', 'packages/*/package.json', 'pnpm-lock.yaml', 'pnpm-workspace.yaml') }}
       - name: Install dependencies
         if: steps.modules-cache.outputs.cache-hit != 'true'
         run: pnpm install --frozen-lockfile
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 53b67468..5542f0c2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -110,11 +110,12 @@ jobs:
         # .git/config cannot push or publish, and the submodule init a few steps
         # down is the one place in this file that still wants a working remote.
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
-        # The emsdk image bundles node 20.18.0; pnpm 11 requires >=22.13 and
-        # vite 7 (via vitest 3) requires >=20.19. emcc is unaffected — it uses
-        # the node binary pinned in its own .emscripten config, not PATH.
+        # The emsdk image bundles node 20.18.0, which reached end of life on
+        # 2026-04-30 and fails this repo's engines.node check (>=24) besides. emcc is
+        # unaffected — it uses the node binary pinned in its own .emscripten
+        # config, not PATH, so this only governs pnpm and the build scripts.
         with:
-          node-version: '22'
+          node-version: '24'
       - name: Provide pnpm via Corepack
         run: |
           corepack enable pnpm
@@ -173,12 +174,12 @@ jobs:
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           # Pinned exactly, not floating '24'. Node bundles npm, and this is
-          # the version that ends up publishing: v24.19.0 ships npm 11.17.0,
+          # the version that ends up publishing: v24.20.0 ships npm 11.19.0,
           # comfortably past the 11.5.1 that OIDC trusted publishing needs. So
           # bumping Node here is also how npm gets bumped — no separate
           # `npm install --global` step, which would re-download an unpinned
           # npm on the morning of every release.
-          node-version: '24.19.0'
+          node-version: '24.20.0'
       - name: Provide pnpm via Corepack
         run: |
           corepack enable pnpm
@@ -426,8 +427,8 @@ jobs:
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           # Same exact pin as the release job: this is where its bundled npm
-          # (11.17.0, past the 11.5.1 OIDC floor) actually gets used.
-          node-version: '24.19.0'
+          # (11.19.0, past the 11.5.1 OIDC floor) actually gets used.
+          node-version: '24.20.0'
       - name: Download built dists
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
diff --git a/docs/ci/self-hosted-runner.md b/docs/ci/self-hosted-runner.md
index ad758cd8..89f777cb 100644
--- a/docs/ci/self-hosted-runner.md
+++ b/docs/ci/self-hosted-runner.md
@@ -37,7 +37,7 @@ and the regression gate is trustworthy.
 - **flock** (from `util-linux`, present on any stock Linux) — `tools/ci/with-nashua-lock.sh`
   needs it for the shared-box mutex below.
 - Node is provisioned per-job by `actions/setup-node@v4`, pinned to an **exact**
-  version (`22.23.1`) rather than the `'22'` range the other jobs use — see
+  version (`24.20.0`) rather than the `'24'` range the other jobs use — see
   [Hardware hygiene](#hardware-hygiene-for-stable-numbers) for why. It does not
   need to be pre-installed; the runner user only needs write access to the actions
   tool cache. **The box provides no node on `PATH` of its own**, so anything a
@@ -52,8 +52,8 @@ and the regression gate is trustworthy.
   ```
   With no argument, `corepack prepare --activate` installs exactly the version
   in the root `package.json`'s `packageManager` field, so the bench box can
-  never drift from the build jobs. Corepack is bundled with node 22 and fetches
-  over Node's own https. That is deliberate rather than incidental: `npm i -g`
+  never drift from the build jobs. Corepack is still bundled with node 24 and
+  fetches over Node's own https. That is deliberate rather than incidental: `npm i -g`
   is unreliable here because the npm reachable from the GitHub runner's
   *bundled* node on this box is corrupted (`Cannot find module '../lib/cli.js'`)
   — the same wall OHIF's workflow hit, which is why it provisions pnpm through
@@ -184,14 +184,16 @@ This runner hosts the **simulation** gate only, which changes what matters:
 - The only hard requirement for cross-run stability is a **fixed CPU model**
   (don't migrate the box between different physical CPUs), since the modeled
   cache is derived from it.
-- **Pin node exactly, never by range.** Given a range like `'22'`, setup-node uses
+- **Pin node exactly, never by range.** Given a range like `'24'`, setup-node uses
   any satisfying version already in the tool cache *without consulting the
   network*. On a self-hosted box that cache persists, so the bench silently
-  freezes on the first 22.x it ever saw and then jumps whenever the box is
+  freezes on the first 24.x it ever saw and then jumps whenever the box is
   rebuilt or the cache is cleared — and V8 changes between patch releases move
-  instruction counts. Both codspeed jobs pin `22.23.1`, the version the current
+  instruction counts. Both codspeed jobs pin `24.20.0`, the version the current
   baseline was measured on. Changing it is a deliberate re-seed event, exactly
-  like a glibc or valgrind bump.
+  like a glibc or valgrind bump. The move from `22.23.1` to `24.20.0` was one
+  such event: node 24 is a different V8 major, so expect the first `main` run
+  after it to show large deltas across every bench and mean nothing by them.
 - **Don't casually `apt upgrade` the box.** glibc is the sharpest example:
   different glibc builds dispatch different code paths, so a bump shifts
   instruction counts much as a different CPU would — that is the subject of
diff --git a/package.json b/package.json
index 9d84d996..338b2e2e 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "playwright-core": "^1.49.0"
   },
   "engines": {
-    "node": ">=22.13",
+    "node": ">=24",
     "pnpm": ">=11"
   },
   "scripts": {
diff --git a/tools/docker/Dockerfile b/tools/docker/Dockerfile
index c0555e55..99ddc698 100644
--- a/tools/docker/Dockerfile
+++ b/tools/docker/Dockerfile
@@ -55,9 +55,9 @@ RUN apt-get update \
     # what makes that fail now, with a readable message, instead of during a
     # codec build later.
     && cmake --version \
-    # node 22 on PATH, matching CI's setup-node step. emcc is unaffected: it
+    # node 24 on PATH, matching CI's setup-node step. emcc is unaffected: it
     # invokes the node pinned in its own .emscripten config, not this one.
-    && curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && curl -fsSL https://deb.nodesource.com/setup_24.x | bash - \
     && apt-get install -y nodejs \
     && apt-get autoremove -y \
     && apt-get clean -y \
diff --git a/tools/release/README.md b/tools/release/README.md
index 90c7d72e..3c729b00 100644
--- a/tools/release/README.md
+++ b/tools/release/README.md
@@ -69,7 +69,7 @@ token runs nothing but `npm`, the pinned actions and `publish-order.mjs` (node b
    goes out after the six siblings whose ranges it carries. `--ignore-scripts` is deliberate:
    `prepublishOnly` re-runs `bash build.sh`, and this job has no emscripten toolchain — the dist
    being published is the artifact built in step 1 from the same commit. npm's version comes from
-   the exactly-pinned `node-version` (v24.19.0 → npm 11.17.0, past the 11.5.1 OIDC floor), so there
+   the exactly-pinned `node-version` (v24.20.0 → npm 11.19.0, past the 11.5.1 OIDC floor), so there
    is no `npm install --global npm@latest` re-downloading an unpinned publisher every release.
 4. **`github-releases`** — a GitHub Release per tag, from the package list `publish` uploaded. It is
    a separate job so `gh release create`'s `contents: write` never coexists with the OIDC publish