diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 3df34fa..012aee9 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -38,15 +38,18 @@ jobs:
           MISE_LOG_LEVEL: ${{ runner.debug == '1' && 'trace' || 'info' }}
 
   test:
+    name: test (${{ matrix.os }}, shard ${{ matrix.shard }})
     timeout-minutes: 30
     concurrency:
-      group: test-${{ github.workflow }}-${{ github.ref }}-${{ matrix.os }}
+      group: >-
+        test-${{ github.workflow }}-${{ github.ref }}-${{ matrix.os }}-${{ matrix.shard }}
       cancel-in-progress: false
       queue: max
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+        shard: ["1/3", "2/3", "3/3"]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v7.0.1
@@ -57,7 +60,7 @@ jobs:
           cache: true
           experimental: true
           log_level: ${{ runner.debug == '1' && 'trace' || 'info' }}
-      - run: mise test
+      - run: mise test --shard ${{ matrix.shard }}
         env:
           MISE_LOG_LEVEL: ${{ runner.debug == '1' && 'trace' || 'info' }}
           LOGTAPE_TEST_MODE: ${{ runner.debug == '1' && 'always' || 'on-failure' }}
diff --git a/mise.toml b/mise.toml
index 57a094b..618e4fd 100644
--- a/mise.toml
+++ b/mise.toml
@@ -250,6 +250,7 @@ description = "Run tests"
 depends = ["build"]
 usage = '''
 flag "-d --debug" help="Run tests in debug mode"
+flag "--shard <shard>" help="Run one test shard as INDEX/TOTAL"
 '''
 run = '''
 #!/usr/bin/env nu
@@ -260,7 +261,8 @@ if "usage_debug" in $env {
   $env.LOGTAPE_TEST_MODE = "on-failure"
   $env.LOGTAPE_TEST_LOWEST_LEVEL = "debug"
 }
-pnpm run --parallel --recursive test --test-concurrency=1
+let shard = (if "usage_shard" in $env { [$"--test-shard=($env.usage_shard)"] } else { [] })
+node --test ...$shard "packages/*/src/**/*.test.ts"
 '''
 
 [tasks."test:postgres"]