Ruby 2.5. is now the minimum version docker-sync operates under

Upgrade all dependencies which where hold back due to ruby 2.4 support

Gemfile

@@ -5,10 +5,9 @@ gemspec
 group :test do
   gem 'rspec'
   gem 'rspec-bash'
-  # last version supports ruby 2.4
-  gem 'activesupport', '~>5.2.8'
+  # last version supports ruby 2.5
+  gem 'activesupport', '~>6.1.7'
   gem 'os', '>= 1.0.0'
-  # for ruby 2.4 support
-  gem 'rdoc', '<=6.3.2'
-  gem 'minitest', '<=5.15.0'
+  gem 'rdoc', '<=6.4.0'
+  gem 'minitest', '<=5.16.3'
 end

Gemfile.lock

@@ -7,16 +7,17 @@ PATH
       gem_update_checker (~> 0.2.0, >= 0.2.0)
       os (>= 1.0.0)
       terminal-notifier (= 2.0.0)
-      thor (~> 1.2, >= 1.2.0)
+      thor (~> 1.2, >= 1.2.1)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.2.8.1)
+    activesupport (6.1.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     coderay (1.1.3)
     concurrent-ruby (1.1.10)
     daemons (1.4.1)
@@ -50,22 +51,22 @@ GEM
     sparsify (1.1.0)
     terminal-notifier (2.0.0)
     thor (1.2.1)
-    thread_safe (0.3.6)
-    tzinfo (1.2.10)
-      thread_safe (~> 0.1)
+    tzinfo (2.0.5)
+      concurrent-ruby (~> 1.0)
+    zeitwerk (2.6.4)
 
 PLATFORMS
   aarch64-linux
   x86_64-darwin-17
   x86_64-linux
 
 DEPENDENCIES
-  activesupport (~> 5.2.8)
+  activesupport (~> 6.1.7)
   docker-sync!
-  minitest (<= 5.15.0)
+  minitest (<= 5.16.3)
   os (>= 1.0.0)
   pry
-  rdoc (<= 6.3.2)
+  rdoc (<= 6.4.0)
   rspec
   rspec-bash
 

docker-sync.gemspec

@@ -9,16 +9,15 @@ Gem::Specification.new do |s|
   s.files       = Dir['lib/**/*.rb', 'tasks/**/*.thor', 'Thorfile', 'bin/*', 'VERSION']
   s.license     = 'GPL-3.0'
   s.homepage    = 'https://github.com/EugenMayer/docker_sync'
-  s.required_ruby_version = '>= 2.4'
+  s.required_ruby_version = '>= 2.5'
 
-  s.add_runtime_dependency 'thor', '~> 1.2', '>= 1.2.0'
+  s.add_runtime_dependency 'thor', '~> 1.2', '>= 1.2.1'
   s.add_runtime_dependency 'gem_update_checker', '~> 0.2.0', '>= 0.2.0'
   s.add_runtime_dependency 'terminal-notifier', '2.0.0'
   s.add_runtime_dependency 'dotenv', '~> 2.8', '>= 2.8.1'
   s.add_runtime_dependency 'daemons', '~> 1.4', '>= 1.4.1'
   s.add_runtime_dependency 'os', '>= 1.0.0'
 
   s.add_development_dependency 'pry'
-  # support for ruby 2.4
-  s.add_development_dependency 'rdoc', '<= 6.3.2'
+  s.add_development_dependency 'rdoc', '<= 6.4.0'
 end