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fpm tries to load a downloaded gem's metadata, it can fail with an error
psych/class_loader.rb:99:in `find': Tried to load unspecified class: Gem::Specification (Psych::DisallowedClass)
This seems to be a new failure caused by an upstream ruby or psych change. This ruby psych issue seems related: ruby/psych#487
The above ruby psych change mentions that safe_load is now the default (YAML.load is "safe_load") and the previous load method has been renamed unsafe_load.
Need to dig a bit more to figure out the best solution that does safe loading, but for now, calling unsafe_load when it's available is probably a short fix.