diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0b03fe8..864d57f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,9 @@ on:
         required: true
         default: "main"
 
+env:
+  PNPM_VERSION: 9.12.1
+
 jobs:
   setup:
     runs-on: ubuntu-latest
@@ -21,8 +24,13 @@ jobs:
         with:
           ref: ${{ github.head_ref || github.event.inputs.branch }}
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -30,7 +38,7 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
   test:
     runs-on: ubuntu-latest
@@ -40,8 +48,13 @@ jobs:
         with:
           ref: ${{ github.head_ref || github.event.inputs.branch }}
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -49,10 +62,10 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Run tests
-        run: bun run test
+        run: pnpm run test
 
   lint:
     runs-on: ubuntu-latest
@@ -62,8 +75,13 @@ jobs:
         with:
           ref: ${{ github.head_ref || github.event.inputs.branch }}
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -71,10 +89,10 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Run linter
-        run: bun run lint
+        run: pnpm run lint
 
   typecheck:
     runs-on: ubuntu-latest
@@ -84,8 +102,13 @@ jobs:
         with:
           ref: ${{ github.head_ref || github.event.inputs.branch }}
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -93,10 +116,10 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Run typecheck
-        run: bun run typecheck
+        run: pnpm run typecheck
 
   build:
     runs-on: ubuntu-latest
@@ -106,8 +129,13 @@ jobs:
         with:
           ref: ${{ github.head_ref || github.event.inputs.branch }}
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -115,9 +143,9 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Build
         run: |
-            bun run build
-            bunx publint
+          pnpm run build
+          pnpx publint
diff --git a/.github/workflows/package-size.yml b/.github/workflows/package-size.yml
index 1facce0..d87b205 100644
--- a/.github/workflows/package-size.yml
+++ b/.github/workflows/package-size.yml
@@ -7,6 +7,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  PNPM_VERSION: 9.12.1
+
 jobs:
   pkg-size-report:
     name: Package Size Report
@@ -16,10 +19,13 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: package.json
+
+      - uses: pnpm/action-setup@v4
         with:
-          node-version: "20.x"
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Set up Bun
         uses: oven-sh/setup-bun@v2
@@ -32,7 +38,7 @@ jobs:
       - name: Package size report
         uses: preactjs/compressed-size-action@v2
         with:
-          install-script: "bun install"
+          install-script: "pnpm install"
           build-script: "build"
           pattern: "./dist/**/*.{js}"
           exclude: "{**/*.map,**/node_modules/**}"
diff --git a/.github/workflows/pre-release.yml b/.github/workflows/pre-release.yml
index d446263..32ba996 100644
--- a/.github/workflows/pre-release.yml
+++ b/.github/workflows/pre-release.yml
@@ -6,6 +6,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  PNPM_VERSION: 9.12.1
+
 jobs:
   pre-release:
     runs-on: ubuntu-latest
@@ -14,13 +17,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - run: corepack enable
       - uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version-file: package.json
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -28,9 +31,9 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Build
-        run: bun run build
+        run: pnpm run build
 
-      - run: bunx pkg-pr-new publish
+      - run: pnpx pkg-pr-new publish
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 59d739c..b369e01 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -10,6 +10,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  PNPM_VERSION: 9.12.1
+
 jobs:
   release:
     name: Release
@@ -18,13 +21,13 @@ jobs:
       - name: Checkout Repo
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: "20.x"
+          node-version-file: package.json
 
-      - name: Set up Bun
-        uses: oven-sh/setup-bun@v2
+      - uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
 
       - name: Cache node_modules
         uses: ./.github/actions/cache-node-modules
@@ -32,18 +35,18 @@ jobs:
           path: "**/node_modules"
 
       - name: Install dependencies
-        run: bun install
+        run: pnpm install
 
       - name: Build
         run: |
-          bun run build
-          bunx publint
+          pnpm run build
+          pnpx publint
 
       - name: Create Release Pull Request
         id: changesets
         uses: changesets/action@v1
         with:
-          publish: bun run release
+          publish: pnpm run release
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/.mise.toml b/.mise.toml
new file mode 100644
index 0000000..8d7d91f
--- /dev/null
+++ b/.mise.toml
@@ -0,0 +1,2 @@
+[tools]
+pnpm = "9.12.1"
diff --git a/package.json b/package.json
index 66736ca..5736f15 100644
--- a/package.json
+++ b/package.json
@@ -78,5 +78,6 @@
   "dependencies": {
     "@hono/zod-validator": "^0.2.2",
     "zod": "^3.23.8"
-  }
+  },
+  "packageManager": "pnpm@9.12.1"
 }