diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b2dcbef..bfcb268 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.3.0'
+          - '4.0.1'
 
     steps:
       - uses: actions/checkout@v4
@@ -28,4 +28,4 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
       - name: Run the tests
-        run: rspec
\ No newline at end of file
+        run: bundle exec rspec
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 211f2ce..eef4294 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,25 @@
 # Rbcli Changelog
 
+## 0.4.4 (Mar 19, 2026)
+
+### Improvements
+
+* Updated minimum required Ruby version to 3.4.0
+* Switched all dependency version constraints to open-ended (`>=`) and updated minimum versions
+* Added `base64` as an explicit dependency
+* Removed redundant `.select` filter in parser on a collection that was already filtered
+* Refactored engine priority check to avoid running the same `select` query twice
+* Simplified `File.expand_path(File.dirname(__FILE__))` to `__dir__` in `rbcli.rb`
+* Added missing `# frozen_string_literal: true` magic comment to `parser.rb`
+* Fixed typo "Compatiblity" → "Compatibility" in helptext banner
+
+### Bugfixes
+
+* Fixed logger method definitions generated by a `%w()` list with commas, which produced invalid method names like `:"debug,"` instead of `:debug`
+* Fixed `!=` comparison being used instead of `+=` concatenation in the parser's interactive prompt, causing the default value hint never to be displayed
+* Fixed command name validation regex not being anchored, which allowed invalid names containing special characters to pass validation
+* Fixed test assertion in `gem_spec.rb` using `.equal?` as a bare method call (a no-op) instead of a proper RSpec `eq` matcher
+
 ## 0.4.3 (Oct 22, 2025)
 
 ### Improvements
diff --git a/lib/rbcli.rb b/lib/rbcli.rb
index 64a42b8..14ee87c 100644
--- a/lib/rbcli.rb
+++ b/lib/rbcli.rb
@@ -3,8 +3,8 @@
 #     Rbcli -- A framework for developing command line applications in Ruby      #
 #     Copyright (C) 2024 Andrew Khoury <akhoury@live.com>                        #
 ##################################################################################
-RBCLI_LIBDIR = File.join(File.expand_path(File.dirname(__FILE__)), 'rbcli')
-RBCLI_TOOLDIR = File.join(File.expand_path(File.dirname(__FILE__)), 'rbcli-tool')
+RBCLI_LIBDIR = File.join(__dir__, 'rbcli')
+RBCLI_TOOLDIR = File.join(__dir__, 'rbcli-tool')
 EXECUTABLE = File.basename($0).gsub(/\.[^.]+$/, '')
 
 # Prerequisites for anything else to run
diff --git a/lib/rbcli/components/commands/command.rb b/lib/rbcli/components/commands/command.rb
index fac43d0..5eaf449 100644
--- a/lib/rbcli/components/commands/command.rb
+++ b/lib/rbcli/components/commands/command.rb
@@ -5,7 +5,7 @@
 ##################################################################################
 class Rbcli::Command
   def initialize name
-    raise Rbcli::CommandError.new "Command name can only contain the characters [A-Za-z0-9_]+" unless /[A-Za-z0-9_]+/.match?(name)
+    raise Rbcli::CommandError.new "Command name can only contain the characters [A-Za-z0-9_]+" unless /\A[A-Za-z0-9_]+\z/.match?(name.to_s)
     @name = name.to_s.downcase
     @default = false
     @description = nil
diff --git a/lib/rbcli/components/core/engine.rb b/lib/rbcli/components/core/engine.rb
index 2dc2815..8bb3116 100644
--- a/lib/rbcli/components/core/engine.rb
+++ b/lib/rbcli/components/core/engine.rb
@@ -7,8 +7,9 @@ module Rbcli::Engine
   @operations = []
 
   def self.register_operation operation, name: nil, priority: nil
-    if @operations.select { |op| op[:priority] == priority }.count != 0
-      raise Rbcli::Error.new "The Rbcli engine can not have two operations defined with the same priority: #{name}, #{@operations.select { |op| op[:priority] == priority }.join(", ")}"
+    conflicts = @operations.select { |op| op[:priority] == priority }
+    unless conflicts.empty?
+      raise Rbcli::Error, "The Rbcli engine can not have two operations defined with the same priority: #{name}, #{conflicts.join(", ")}"
     end
     @operations << { operation: operation, name: name, priority: priority }
   end
diff --git a/lib/rbcli/components/logger/logger.rb b/lib/rbcli/components/logger/logger.rb
index be34298..544348c 100644
--- a/lib/rbcli/components/logger/logger.rb
+++ b/lib/rbcli/components/logger/logger.rb
@@ -98,12 +98,6 @@ def unknown message, progname = nil, &block
     self.add(Logger::UNKNOWN, message, progname, &block)
   end
 
-  %w(debug, info, warn, error, fatal, unknown).each do |l|
-    self.define_method(l.to_sym) do |message, progname = nil, &block|
-      self.send(:add, l.to_sym, message, progname, &block)
-    end
-  end
-
   private
 
   def self.colorlevel level
diff --git a/lib/rbcli/components/parser/parser.rb b/lib/rbcli/components/parser/parser.rb
index 7a9f0f6..0c0fb08 100644
--- a/lib/rbcli/components/parser/parser.rb
+++ b/lib/rbcli/components/parser/parser.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ##################################################################################
 #     Rbcli -- A framework for developing command line applications in Ruby      #
 #     Copyright (C) 2024 Andrew Khoury <akhoury@live.com>                        #
@@ -24,7 +25,7 @@ def self.parse
       bannerstr += "\n"
     end
     unless appinfo[:compatibility].nil? || appinfo[:compatibility].empty?
-      bannerstr += "Compatiblity: "
+      bannerstr += "Compatibility: "
       if appinfo[:compatibility].length == 2
         bannerstr += appinfo[:compatibility].join(' and ') + "\n"
       else
@@ -46,7 +47,7 @@ def self.parse
 
     @parser.synopsis bannerstr
     (Rbcli::Warehouse.get(:opts, :unparsedopts) || []).each { |args| @parser.opt *args }
-    @parser.stop_on(non_default_commands.select { |_name, cmd| !cmd.default? }.keys)
+    @parser.stop_on(non_default_commands.keys)
 
     begin
       opts = @parser.parse
@@ -148,7 +149,7 @@ def self.prompt_for_missing
         prompt_string += ' (' + (param_value ? 'Y' : 'y') + '/' + (param_value ? 'n' : 'N') + ')'
         opt[:default] = param_value if opt[:default].nil?
       elsif !opt[:default].nil?
-        prompt_string != " (default: #{opt[:default]})"
+        prompt_string += " (default: #{opt[:default]})"
       end
       prompt_string += ':' unless %w(. ? ! :).include?(opt[:prompt][-1])
       prompt_string += ' '
diff --git a/rbcli.gemspec b/rbcli.gemspec
index 33d31d7..3c17fec 100644
--- a/rbcli.gemspec
+++ b/rbcli.gemspec
@@ -34,23 +34,24 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = ">= 2.6.10"
-
-  spec.add_development_dependency "rake", "~> 13.0"
-  spec.add_development_dependency "rspec", "~> 3.0"
-
-  spec.add_dependency "colorize", "~> 1.1"
-  spec.add_dependency "octokit", "~> 8.1"
-  spec.add_dependency "faraday-retry", "~> 2.2" # Required for octokit
-  spec.add_dependency "json-schema", "~> 4.3"
-  spec.add_dependency "bigdecimal", "~> 3.1" # Required for json-schema
-  spec.add_dependency "erb", "~> 4.0"
-  spec.add_dependency "deep_merge", "~> 1.2"
-  spec.add_dependency "paint", "~> 2.3"
-  spec.add_dependency "erubis", "~> 2.7"
-  spec.add_dependency "rest-client", "~> 2.1"
-  spec.add_dependency "toml", "~> 0.3"
+  spec.required_ruby_version = ">= 3.4.0"
+
+  spec.add_development_dependency "rake", '~> 13.3'
+  spec.add_development_dependency "rspec", '~> 3.13'
+
+  spec.add_dependency "colorize", '>= 1.1'
+  spec.add_dependency "octokit", '>= 8.1'
+  spec.add_dependency "faraday-retry", '>= 2.4' # Required for octokit
+  spec.add_dependency "json-schema", '>= 4.3'
+  spec.add_dependency "bigdecimal", '>= 3.3' # Required for json-schema
+  spec.add_dependency "erb", '>= 4.0'
+  spec.add_dependency "deep_merge", '>= 1.2'
+  spec.add_dependency "paint", '>= 2.3'
+  spec.add_dependency "erubis", '>= 2.7'
+  spec.add_dependency "rest-client", '>= 2.1'
+  spec.add_dependency "toml", '>= 0.3'
+  spec.add_dependency "base64", '>= 0.3'
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
-end
\ No newline at end of file
+end
diff --git a/spec/gem_spec.rb b/spec/gem_spec.rb
index 23b1359..fca792b 100644
--- a/spec/gem_spec.rb
+++ b/spec/gem_spec.rb
@@ -13,6 +13,6 @@
 
   it "pulls the version number from a file" do
     version = File.read("VERSION")
-    expect(Rbcli::VERSION).equal? version
+    expect(Rbcli::VERSION).to eq(version.chomp.strip)
   end
 end
\ No newline at end of file