```ruby
# Add the opscode APT source for chef
default[:apt][:sources] = node[:apt][:sources] | [ "opscode" ]

# Set the default client version
default[:chef][:client][:version] = "11.6.0-1"

# A list of gems needed by chef recipes
default[:chef][:gems] = []
```

Upgrade chef client to 11.8.0
user
```ruby
# Add the opscode APT source for chef
default[:apt][:sources] = node[:apt][:sources] | [ "opscode" ]

# Set the default client version
default[:chef][:client][:version] = "11.8.0-1"

# A list of gems needed by chef recipes
default[:chef][:gems] = []
```
assistant