diff --git a/.changeset/node-22-support.md b/.changeset/node-22-support.md
new file mode 100644
index 0000000..a656836
--- /dev/null
+++ b/.changeset/node-22-support.md
@@ -0,0 +1,5 @@
+---
+'@seamless-auth/types': patch
+---
+
+Support Node 22 and newer. The `engines` field now requires `>=22` instead of `>=24 <25`, and CI runs on Node 22, 24, and the latest release (fells-code/seamless-auth-api#339).
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fbf715f..c73f473 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,11 +17,18 @@ concurrency:
 
 jobs:
   ci:
-    name: Lint, typecheck, test, build
+    name: Lint, typecheck, test, build (Node ${{ matrix.node-version }})
     runs-on: ubuntu-latest
     env:
       HUSKY: 0
 
+    strategy:
+      fail-fast: false
+      matrix:
+        # The supported range is engines >=22: the oldest supported LTS, the
+        # development default from .nvmrc, and the newest release.
+        node-version: [22, 24, latest]
+
     steps:
       - name: Checkout
         uses: actions/checkout@v7
@@ -31,7 +38,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v7
         with:
-          node-version-file: '.nvmrc'
+          node-version: ${{ matrix.node-version }}
           cache: npm
 
       - name: Install dependencies
@@ -59,3 +66,14 @@ jobs:
 
       - name: Verify package contents
         run: npm run check-npm-build
+
+  # The ruleset on main requires a check with this exact name, which a matrix
+  # job no longer reports, so this job reports it once every leg is done.
+  ci-result:
+    name: Lint, typecheck, test, build
+    needs: ci
+    if: always()
+    runs-on: ubuntu-latest
+    steps:
+      - name: Require every Node version to pass
+        run: test "${{ needs.ci.result }}" = success
diff --git a/AGENTS.md b/AGENTS.md
index 1c90875..5e90e3b 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -107,8 +107,8 @@ src/
 | Add changeset | `npm run changeset`       |
 | Pack preview  | `npm run check-npm-build` |
 
-- Node version is pinned by `.nvmrc` (Node 24); CI reads it via
-  `node-version-file`. Run `nvm use` locally to match.
+- Supported Node is `>=22`. CI tests 22, 24, and the latest release;
+  `.nvmrc` pins Node 24 for development and releases. Run `nvm use` locally.
 - commitlint enforces Conventional Commits; husky runs lint-staged on commit.
 - Releases go through Changesets. See `RELEASES.md` for the flow and for how to
   pick the bump.
diff --git a/README.md b/README.md
index 994b259..787c8b7 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ breaking by default. See [Versioning and stability](#versioning-and-stability).
 
 |                      |                           |
 | -------------------- | ------------------------- |
-| Node                 | 24 (`>=24 <25`)           |
+| Node                 | 22 or newer (`>=22`)      |
 | TypeScript           | 5.x                       |
 | Runtime dependencies | `zod@^4` and nothing else |
 
@@ -191,7 +191,7 @@ acknowledgement window, and the coordinated disclosure process.
 ## Development
 
 ```bash
-nvm use          # Node 24, pinned by .nvmrc
+nvm use          # Node 24 for development, pinned by .nvmrc
 npm ci
 
 npm run build      # compile to dist/
diff --git a/package-lock.json b/package-lock.json
index d11f214..2a536d2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@seamless-auth/types",
-  "version": "0.22.0",
+  "version": "0.26.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@seamless-auth/types",
-      "version": "0.22.0",
+      "version": "0.26.0",
       "license": "Apache-2.0",
       "dependencies": {
         "zod": "^4.3.6"
@@ -26,7 +26,7 @@
         "vitest": "^4.1.1"
       },
       "engines": {
-        "node": ">=24 <25"
+        "node": ">=22"
       }
     },
     "node_modules/@babel/code-frame": {
diff --git a/package.json b/package.json
index d1bf0d7..ac0ce0c 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "vitest": "^4.1.1"
   },
   "engines": {
-    "node": ">=24 <25"
+    "node": ">=22"
   },
   "publishConfig": {
     "access": "public",