Rails App errors after pg gem update - ruby-on-rails

Question

I updated the pg gem for my database to the 1.0.0 version and am now having issues. I am trying to revert to the previous version, but am still getting errors. Anyone else having this same issue?
Gemfile
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.21.0'
Error when I run rake db:migrate
dyld: lazy symbol binding failed: Symbol not found: _rb_fd_init
Referenced from: /Users/topher/.rvm/gems/ruby-2.5.0/gems/pg-0.21.0/lib/pg_ext.bundle
Expected in: flat namespace
No error when I run rails s
When I change my Gemfile to the newest version of the pg gem I get these errors:
Gemfile
# Use postgresql as the database for Active Record
gem 'pg', '~> 1.0.0'
Error when I run rake db:migrate
rake aborted!
Gem::LoadError: Specified 'postgresql' for database adapter,
but the gem is not loaded. Add `gem 'pg'` to your Gemfile
(and ensure its version is at the minimum required by
ActiveRecord).
Error when I run rails s
Specified 'postgresql' for database adapter, but the gem is not
loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is
at the minimum required by ActiveRecord). (Gem::LoadError)
Anyone else run into this issue and have a fix?

Answer 1

After looking into the issue a little bit further and with something that #MartinZinovsky stated in a comment, I wondered if it wasn't an issue with the pg gem, but with another gem not being updated, specifically ActiveRecord. This is the part of the error that got me thinking as it was showing up in both errors:
ensure its version is at the minimum required by ActiveRecord
So, instead of doing bundle update pg as Martin suggested, I did bundle update for it to go through and update all gems that had available updates. When doing this, it did in fact update all of the 'action' and 'active' gems to a newer version, along with the 'activerecord' gem. This has seemed to solve the issues. Now rake db:migrate works and so does rails s. Here is the output after I ran bundle update in case someone else runs into this issue and it is not ActiveRecord only that needed to be updated. Maybe you can use this list to see what else updated on my end to track down why it isn't working for you:
After running bundle update
$ bundle update
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/.............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies.....
Using rake 12.3.0
Using concurrent-ruby 1.0.5
Using i18n 0.9.5 (was 0.9.3)
Using minitest 5.11.3
Using thread_safe 0.3.6
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Using activesupport 5.1.5 (was 5.1.4)
Using builder 3.2.3
Fetching erubi 1.7.1 (was 1.7.0)
Installing erubi 1.7.1 (was 1.7.0)
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Bundle updated!