diff --git a/examples/sandbox_07_ruby_sinatra.py b/examples/sandbox_07_ruby_sinatra.py
index 200bd82..af45e48 100644
--- a/examples/sandbox_07_ruby_sinatra.py
+++ b/examples/sandbox_07_ruby_sinatra.py
@@ -83,7 +83,7 @@ async def main() -> None:
             "bash",
             [
                 "-lc",
-                ("gem install --no-document bundler"),
+                ("gem install --no-document bundler -v 4.0.8"),
             ],
             sudo=True,
         )
diff --git a/examples/sandbox_09_rails_api.py b/examples/sandbox_09_rails_api.py
index 6a533cd..3d9a9a3 100644
--- a/examples/sandbox_09_rails_api.py
+++ b/examples/sandbox_09_rails_api.py
@@ -74,7 +74,7 @@ async def main() -> None:
             "bash",
             [
                 "-lc",
-                ("gem install --no-document bundler && gem install --no-document rails"),
+                ("gem install --no-document bundler -v 4.0.8 && gem install --no-document rails"),
             ],
             sudo=True,
         )