diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3e357f2..2b860b5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -25,9 +25,7 @@ jobs:
           --health-retries 5
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
-        with:
-          node-version-file: package.json
+      - uses: jdx/mise-action@v2
       - run: npm ci
       - run: npm run ci
       - uses: codecov/codecov-action@v6
@@ -49,10 +47,7 @@ jobs:
           --health-retries 5
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
-        with:
-          node-version-file: package.json
-      - uses: oven-sh/setup-bun@v2
+      - uses: jdx/mise-action@v2
       - run: npm ci
       - run: bun run ci:bun
   # https://commitlint.js.org/guides/ci-setup.html
@@ -62,9 +57,7 @@ jobs:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-      - uses: actions/setup-node@v6
-        with:
-          node-version-file: package.json
+      - uses: jdx/mise-action@v2
       - run: npm install -D @commitlint/cli @commitlint/config-conventional
       - name: Validate current commit (last commit) with commitlint
         if: github.event_name == 'push'
diff --git a/.github/workflows/pkg-pr-new.yaml b/.github/workflows/pkg-pr-new.yaml
index efd818c..1db9620 100644
--- a/.github/workflows/pkg-pr-new.yaml
+++ b/.github/workflows/pkg-pr-new.yaml
@@ -11,9 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-node@v6
-        with:
-          node-version-file: package.json
+      - uses: jdx/mise-action@v2
       - run: npm ci
       - run: npm run build
       - run: >
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9fb573d..38d32aa 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,3 +21,11 @@ why it belongs in OpenWorkflow. The core team will help confirm direction before
 any PRs start.
 
 PRs that skip these steps may be closed.
+
+## Development environment
+
+This repo uses [mise](https://mise.jdx.dev/) to manage the Node and Bun versions
+used for development. Once you have mise installed, run `mise trust` followed by
+`mise install` from the repo root to install the versions configured in
+`mise.toml`. The GitHub Actions workflows install those versions via
+`jdx/mise-action`.
diff --git a/mise.toml b/mise.toml
new file mode 100644
index 0000000..2acf4ae
--- /dev/null
+++ b/mise.toml
@@ -0,0 +1,3 @@
+[tools]
+node = "lts"
+bun = "1"
diff --git a/package-lock.json b/package-lock.json
index f778081..e6bcf7e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12952,36 +12952,6 @@
         }
       }
     },
-    "node_modules/nitro/node_modules/chokidar": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-5.0.0.tgz",
-      "integrity": "sha512-TQMmc3w+5AxjpL8iIiwebF73dRDF4fBIieAqGn9RGCWaEVwQ6Fb2cGe31Yns0RRIzii5goJ1Y7xbMwo1TxMplw==",
-      "extraneous": true,
-      "license": "MIT",
-      "dependencies": {
-        "readdirp": "^5.0.0"
-      },
-      "engines": {
-        "node": ">= 20.19.0"
-      },
-      "funding": {
-        "url": "https://paulmillr.com/funding/"
-      }
-    },
-    "node_modules/nitro/node_modules/readdirp": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-5.0.0.tgz",
-      "integrity": "sha512-9u/XQ1pvrQtYyMpZe7DXKv2p5CNvyVwzUB6uhLAnQwHMSgKMBR62lc7AHljaeteeHXn11XTAaLLUVZYVZyuRBQ==",
-      "extraneous": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 20.19.0"
-      },
-      "funding": {
-        "type": "individual",
-        "url": "https://paulmillr.com/funding/"
-      }
-    },
     "node_modules/nitro/node_modules/unstorage": {
       "version": "2.0.0-alpha.7",
       "resolved": "https://registry.npmjs.org/unstorage/-/unstorage-2.0.0-alpha.7.tgz",
@@ -16552,20 +16522,6 @@
         }
       }
     },
-    "node_modules/vite-tsconfig-paths/node_modules/typescript": {
-      "version": "5.9.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
-      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "extraneous": true,
-      "license": "Apache-2.0",
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "node_modules/vitefu": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/vitefu/-/vitefu-1.1.3.tgz",