Ruby-on-Rails: Cannot set correct Ruby Version

Dearest Community.

Here's an odd one, and I cannot figure this one out myself.

I am about to deploy a Ruby-on-Rails app to a production server. I like to keep all versions consistent between development and production as you do.

In my Gemfile I set the Ruby version to 2.7.1 (correctly), and on development I installed 2.7.1 and use that version locally for this specific project. All works just fine! - here's the entry:

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.7.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 6.0.3', '>= 6.0.3.2'
...

The Problem:

On production I installed and use (via rbenv) ruby 2.7.1. And I verified that the version is installed & in use! However, when it try to migrate my database or do any other task for that matter it outputs the following

Your Ruby version is 2.7.0, but your Gemfile specified 2.7.1

I do not even have 2.7.0 installed. So for the sake of it I edited the Gemfile on production to run the test. For the purpose of the test I set the ruby verions to 2.7.0 and run another command that fires up the rack. Now the message is:

Your Ruby version is 2.7.1, but your Gemfile specified 2.7.0

What is happening?! I have never ever had or saw a similar issue before. Any help is much appreciated! Thank you!

Here are the environment details:

$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"

ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]

$ rails -v
Rails 6.0.3.2

$ bundle -v
Bundler version 2.1.4