```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/zipline/version', __FILE__)

Gem::Specification.new do |gem|
  gem.authors       = ["Ram Dobson"]
  gem.email         = ["ram.dobson@solsystemscompany.com"]
  gem.description   = %q{a module for streaming dynamically generated zip files}
  gem.summary       = %q{stream zip files from rails}
  gem.homepage      = "http://github.com/fringd/zipline"

  gem.files         = `git ls-files`.split($\) - %w{.gitignore}
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "zipline"
  gem.require_paths = ["lib"]
  gem.version       = Zipline::VERSION

  gem.add_dependency 'zip_tricks', ['>= 4.0.0', '<= 5.0.0']
  gem.add_dependency 'rails', ['>= 3.2.1', '< 5.1']
  gem.add_dependency 'curb', ['>= 0.8.0', '< 0.10']
end
```

Update the gemspec to use zip_tricks version with uniquify duplicate filenames
user
```ruby
# -*- encoding: utf-8 -*-
require File.expand_path('../lib/zipline/version', __FILE__)

Gem::Specification.new do |gem|
  gem.authors       = ["Ram Dobson"]
  gem.email         = ["ram.dobson@solsystemscompany.com"]
  gem.description   = %q{a module for streaming dynamically generated zip files}
  gem.summary       = %q{stream zip files from rails}
  gem.homepage      = "http://github.com/fringd/zipline"

  gem.files         = `git ls-files`.split($\) - %w{.gitignore}
  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
  gem.name          = "zipline"
  gem.require_paths = ["lib"]
  gem.version       = Zipline::VERSION

  gem.add_dependency 'zip_tricks', ['>= 4.2.1', '<= 5.0.0']
  gem.add_dependency 'rails', ['>= 3.2.1', '< 5.1']
  gem.add_dependency 'curb', ['>= 0.8.0', '< 0.10']
end
```
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