"signatures" did not exist on "v11.6.4"
Bump Rails 4 dependencies
We got rid of `Gemfile.rails4.lock` in `master`, but this stable branch still uses it. To fix this, we just need to run: ``` BUNDLE_GEMFILE=Gemfile.rails4 bundle install ```
We got rid of `Gemfile.rails4.lock` in `master`, but this stable branch still uses it. To fix this, we just need to run: ``` BUNDLE_GEMFILE=Gemfile.rails4 bundle install ```