diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 5e1a2a5..58fa6e8 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -25,10 +25,10 @@ jobs:
           # The sitemap's <lastmod> and the dates on doc pages come from git history.
           fetch-depth: 0
 
+      # The pnpm version comes from package.json's packageManager, the same one
+      # a local `pnpm` switches to
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 10
 
       - name: Setup Node
         uses: actions/setup-node@v4
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 22232ce..0d12c3e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -32,10 +32,10 @@ jobs:
           # history; a shallow clone would leave them out.
           fetch-depth: 0
 
+      # The pnpm version comes from package.json's packageManager, the same one
+      # a local `pnpm` switches to
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 10
 
       - name: Setup Node
         uses: actions/setup-node@v4
diff --git a/package.json b/package.json
index bfb5581..6f9cd71 100644
--- a/package.json
+++ b/package.json
@@ -42,5 +42,6 @@
     "sharp": "^0.34.5",
     "shiki": "^4.0.2",
     "typescript": "^5.7.0"
-  }
+  },
+  "packageManager": "pnpm@10.34.6"
 }