diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 8037428..86c5917 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -45,7 +45,6 @@ jobs:
           python-version: "3.14"
       - uses: astral-sh/setup-uv@v3
       - run: uv venv --python 3.14
-      - run: uv pip install build
       - name: Create tag from version
         run: |
           VERSION=$(python scripts/get-version.py)
@@ -66,6 +65,6 @@ jobs:
           TAG="v$VERSION"
           echo "Verifying tag $TAG matches version $VERSION"
       - name: Build
-        run: uv run python -m build
+        run: uv build
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/examples/sandbox_07_ruby_sinatra.py b/examples/sandbox_07_ruby_sinatra.py
index 200bd82..168fd7c 100644
--- a/examples/sandbox_07_ruby_sinatra.py
+++ b/examples/sandbox_07_ruby_sinatra.py
@@ -47,6 +47,12 @@ async def main() -> None:
     runtime = (
         os.getenv("SANDBOX_RUNTIME") or "node22"
     )  # note: ruby runtime is not supported so we have to install ruby via dnf
+    bundle_env = {
+        "BUNDLE_APP_CONFIG": ".bundle",
+        "BUNDLE_USER_HOME": ".bundle-home",
+        "BUNDLE_PATH": "vendor/bundle",
+        "BUNDLE_CACHE_PATH": "vendor/cache",
+    }
 
     # Sinatra default port is 4567
     port = 4567
@@ -101,10 +107,13 @@ async def main() -> None:
                 "-lc",
                 (
                     f"cd {sandbox.sandbox.cwd} && "
+                    "mkdir -p .bundle-home vendor/cache && "
                     "bundle config set --local path vendor/bundle && "
+                    "bundle config set --local cache_path vendor/cache && "
                     "bundle config set --local without 'development:test'"
                 ),
             ],
+            env=bundle_env,
         )
         async for line in bundler_cfg_cmd.logs():
             print(line.data, end="")
@@ -120,6 +129,7 @@ async def main() -> None:
                 "-lc",
                 (f"cd {sandbox.sandbox.cwd} && bundle install --jobs 4 --retry 3"),
             ],
+            env=bundle_env,
         )
         async for line in bundle_install_cmd.logs():
             print(line.data, end="")
@@ -135,9 +145,10 @@ async def main() -> None:
                 (
                     f"cd {sandbox.sandbox.cwd} && "
                     # Start via rackup using WEBrick, binding to 0.0.0.0 and selected port
-                    f"RACK_ENV=production bundle exec rackup -s webrick -o 0.0.0.0 -p {port}"
+                    f"bundle exec rackup -s webrick -o 0.0.0.0 -p {port}"
                 ),
             ],
+            env={**bundle_env, "RACK_ENV": "production"},
         )
 
         # Stream logs and open browser once server is ready.
diff --git a/examples/sandbox_09_rails_api.py b/examples/sandbox_09_rails_api.py
index 6a533cd..19ec3e9 100644
--- a/examples/sandbox_09_rails_api.py
+++ b/examples/sandbox_09_rails_api.py
@@ -41,6 +41,12 @@ async def main() -> None:
     runtime = (
         os.getenv("SANDBOX_RUNTIME") or "node22"
     )  # note: ruby runtime is not supported so we install ruby via dnf
+    bundle_env = {
+        "BUNDLE_APP_CONFIG": ".bundle",
+        "BUNDLE_USER_HOME": ".bundle-home",
+        "BUNDLE_PATH": "vendor/bundle",
+        "BUNDLE_CACHE_PATH": "vendor/cache",
+    }
 
     # Rails default port is 3000
     port = 3000
@@ -104,6 +110,7 @@ async def main() -> None:
                     "--skip-action-cable "
                     "--skip-system-test "
                     "--skip-git "
+                    "--skip-bundle "
                     "--force"
                 ),
             ],
@@ -122,8 +129,14 @@ async def main() -> None:
             "bash",
             [
                 "-lc",
-                (f"cd {app_path} && bundle config set --local path vendor/bundle"),
+                (
+                    f"cd {app_path} && "
+                    "mkdir -p .bundle-home vendor/cache && "
+                    "bundle config set --local path vendor/bundle && "
+                    "bundle config set --local cache_path vendor/cache"
+                ),
             ],
+            env=bundle_env,
         )
         async for line in bundler_cfg_cmd.logs():
             print(line.data, end="")
@@ -139,6 +152,7 @@ async def main() -> None:
                 "-lc",
                 (f"cd {app_path} && bundle install --jobs 4 --retry 3"),
             ],
+            env=bundle_env,
         )
         async for line in bundle_install_cmd.logs():
             print(line.data, end="")
@@ -157,6 +171,7 @@ async def main() -> None:
                     "bundle exec rails generate scaffold Post title:string body:text"
                 ),
             ],
+            env=bundle_env,
         )
         async for line in scaffold_cmd.logs():
             print(line.data, end="")
@@ -185,6 +200,7 @@ async def main() -> None:
                 "-lc",
                 (f"cd {app_path} && bundle exec rails db:migrate"),
             ],
+            env=bundle_env,
         )
         async for line in migrate_cmd.logs():
             print(line.data, end="")
@@ -200,6 +216,7 @@ async def main() -> None:
                 "-lc",
                 (f"cd {app_path} && bundle exec rails db:seed"),
             ],
+            env=bundle_env,
         )
         async for line in seed_cmd.logs():
             print(line.data, end="")
@@ -216,11 +233,9 @@ async def main() -> None:
             "bash",
             [
                 "-lc",
-                (
-                    f"cd {app_path} && "
-                    f"ALLOWED_HOST={allowed_host} bundle exec rails server -b 0.0.0.0 -p {port}"
-                ),
+                (f"cd {app_path} && bundle exec rails server -b 0.0.0.0 -p {port}"),
             ],
+            env={**bundle_env, "ALLOWED_HOST": allowed_host},
         )
 
         # Stream logs and open browser once server is ready.
diff --git a/scripts/build.sh b/scripts/build.sh
index cab0c02..ccbaf5e 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-uv run python -m build
+uv build