update minumum ruby to 3.0

.github/workflows/cd.yml

@@ -24,7 +24,7 @@ jobs:
         printf -- "---\n:rubygems_api_key: ${GEM_HOST_API_KEY}\n" > $HOME/.gem/credentials
     - name: Install dependencies
       run: |
-        gem update --system 3.2.3
+        gem update --system 3.5.11
         bundle install
     - name: Release
       run: |

Gemfile

@@ -3,5 +3,5 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in dockerapi.gemspec
 gemspec
 
-gem "rake", "~> 12.0"
+gem "rake", "~> 13.0"
 gem "rspec", "~> 3.0"

Gemfile.lock

@@ -11,7 +11,7 @@ GEM
     base64 (0.2.0)
     diff-lcs (1.5.1)
     excon (1.1.1)
-    rake (12.3.3)
+    rake (13.2.1)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -32,7 +32,7 @@ PLATFORMS
 
 DEPENDENCIES
   dockerapi!
-  rake (~> 12.0)
+  rake (~> 13.0)
   rspec (~> 3.0)
 
 BUNDLED WITH

dockerapi.gemspec

@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.description   = "Interact with Docker API directly from Ruby code. Comprehensive implementation (all available endpoints), no local Docker installation required, easily manipulated http responses."
   spec.homepage      = "https://github.com/nu12/dockerapi"
   spec.license       = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+  spec.required_ruby_version = ">= 3.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/nu12/dockerapi.git"