diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1506c1d..07aacc5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
-      matrix: { ruby: ['3.1', '3.2', '3.3', '3.4'] }
+      matrix: { ruby: ['3.2', '3.3', '3.4'] }
 
     steps:
     - name: Check out code
diff --git a/.rubocop.yml b/.rubocop.yml
index b5809ea..ce44a99 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,4 +1,4 @@
-require:
+plugins:
   - rubocop-rspec
   - rubocop-performance
 
@@ -9,10 +9,11 @@ inherit_gem:
 
 AllCops:
   SuggestExtensions: false
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.2
   Exclude:
     - debug.rb
     - 'dev/**/*'
+    - 'tmp/**/*'
     - 'spec/approvals/**/*'
     - 'spec/tmp/**/*'
     # This file contains errors on purpose
diff --git a/bin/victor b/bin/victor
index 115cbe5..bb92a5f 100755
--- a/bin/victor
+++ b/bin/victor
@@ -3,6 +3,7 @@ require 'victor/cli'
 require 'pretty_trace/enable-trim'
 
 include Colsole
+
 PrettyTrace.filter [/gem/, /lib/, %r{bin/victor}, %r{bin/bundle}]
 PrettyTrace.debug_tip
 
diff --git a/lib/victor/cli/commands/convert.rb b/lib/victor/cli/commands/convert.rb
index c551547..3be634b 100644
--- a/lib/victor/cli/commands/convert.rb
+++ b/lib/victor/cli/commands/convert.rb
@@ -4,7 +4,7 @@ module Commands
       class Convert < Base
         summary 'Convert SVG to Ruby code'
 
-        usage 'victor convert SVG_FILE [RUBY_FILE --template NAME]'
+        usage 'victor convert SVG_FILE [--save RUBY_FILE --template NAME]'
         usage 'victor convert (-h|--help)'
 
         option '-t, --template NAME', <<~USAGE
@@ -14,21 +14,15 @@ class Convert < Base
             cli          a Victor CLI compatible DSL script (default)
         USAGE
 
-        param 'SVG_FILE', 'Input SVG file'
+        option '-o, --save RUBY_FILE', 'Save to RUBY file instead of printing to stdout'
+
         param 'RUBY_FILE', 'Output Ruby file. Leave empty to write to stdout'
 
-        example 'victor convert example.svg example.rb'
+        example 'victor convert example.svg --save example.rb'
 
         def run
-          svg_file = args['SVG_FILE']
-          template = args['--template']
-          svg_node = SVGNode.load_file svg_file, layout: template
-
           validate_template template if template
 
-          code = svg_node.render
-          ruby_file = args['RUBY_FILE']
-
           if ruby_file
             File.write ruby_file, code
             say "Saved #{ruby_file}"
@@ -37,6 +31,17 @@ def run
           end
         end
 
+      protected
+
+        def svg_file = args['SVG_FILE']
+        def template = args['--template']
+        def ruby_file = args['--save']
+
+        def svg_node = @svg_node ||= SVGNode.load_file(svg_file, layout: template)
+        def code = @code ||= svg_node.render
+
+      private
+
         def validate_template(template)
           allowed = %w[cli dsl standalone]
           return if allowed.include? template
diff --git a/lib/victor/cli/commands/render.rb b/lib/victor/cli/commands/render.rb
index f4e1fe0..35120f5 100644
--- a/lib/victor/cli/commands/render.rb
+++ b/lib/victor/cli/commands/render.rb
@@ -4,9 +4,11 @@ module Victor
   module CLI
     module Commands
       class Render < Base
+        using PairSplit
+
         summary 'Render Ruby code to SVG'
 
-        usage 'victor render RUBY_FILE [SVG_FILE] [options]'
+        usage 'victor render RUBY_FILE [options] [PARAMS...]'
         usage 'victor render (-h|--help)'
 
         option '-t, --template TEMPLATE', <<~USAGE
@@ -15,28 +17,33 @@ class Render < Base
         USAGE
 
         option '-w, --watch', 'Watch the source file and regenerate on change'
+        option '-o, --save SVG_FILE', 'Save to SVG file instead of printing to stdout'
 
         param 'RUBY_FILE', 'Input Ruby file'
-        param 'SVG_FILE', 'Output SVG file. Leave empty to write to stdout'
+        param 'PARAMS', 'One or more key=value pairs that will be available in the `params` hash for the Ruby script'
 
-        example 'victor render input.rb output.svg'
-        example 'victor render input.rb output.svg --watch'
+        example 'victor render input.rb -o output.svg'
+        example 'victor render input.rb --save output.svg --watch'
         example 'victor render input.rb --template minimal'
+        example 'victor render input.rb color=black "text=Hello World"'
 
         def run
-          if args['--watch']
-            watch_and_generate
-          else
-            generate
-          end
+          args['--watch'] ? watch_and_generate : generate
         end
 
+      protected
+
+        def ruby_file = args['RUBY_FILE']
+        def svg_file = args['--save']
+        def template = args['--template']
+        def params = @params ||= args['PARAMS'].pair_split
+
       private
 
         def generate
           code = File.read ruby_file
 
-          ruby_source = RubySource.new code, ruby_file
+          ruby_source = RubySource.new code, filename: ruby_file, params: params
           ruby_source.evaluate
           ruby_source.template template if template
 
@@ -68,18 +75,6 @@ def watch_and_generate
         def file_watcher
           @file_watcher ||= Filewatcher.new(ruby_file, immediate: true)
         end
-
-        def ruby_file
-          args['RUBY_FILE']
-        end
-
-        def svg_file
-          args['SVG_FILE']
-        end
-
-        def template
-          args['--template']
-        end
       end
     end
   end
diff --git a/lib/victor/cli/refinements/pair_split.rb b/lib/victor/cli/refinements/pair_split.rb
new file mode 100644
index 0000000..5739ad8
--- /dev/null
+++ b/lib/victor/cli/refinements/pair_split.rb
@@ -0,0 +1,13 @@
+module Victor
+  module CLI
+    module PairSplit
+      refine Array do
+        def pair_split(operator = '=')
+          return {} if empty?
+
+          to_h { |pair| pair.split(operator, 2) }.transform_keys(&:to_sym)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/victor/cli/ruby_source.rb b/lib/victor/cli/ruby_source.rb
index 73b99f1..5280f8c 100644
--- a/lib/victor/cli/ruby_source.rb
+++ b/lib/victor/cli/ruby_source.rb
@@ -2,14 +2,18 @@ module Victor
   module CLI
     class RubySource
       include Victor::DSL
-      attr_reader :code, :filename
 
-      def initialize(code, filename = nil)
+      attr_reader :code, :filename, :global_params, :params
+
+      def initialize(code, filename: nil, params: nil)
         @code = code
         @filename = filename
+        @global_params = params || {}
+        @params = global_params
       end
 
-      def evaluate
+      def evaluate(local_params = nil)
+        @params = local_params || global_params
         if filename
           instance_eval code, filename
         else
diff --git a/spec/approvals/cli/convert/help b/spec/approvals/cli/convert/help
index 82d62fe..7bc034b 100644
--- a/spec/approvals/cli/convert/help
+++ b/spec/approvals/cli/convert/help
@@ -1,7 +1,7 @@
 Convert SVG to Ruby code
 
 Usage:
-  victor convert SVG_FILE [RUBY_FILE --template NAME]
+  victor convert SVG_FILE [--save RUBY_FILE --template NAME]
   victor convert (-h|--help)
 
 Options:
@@ -11,15 +11,15 @@ Options:
       dsl          a Victor DSL script
       cli          a Victor CLI compatible DSL script (default)
 
+  -o, --save RUBY_FILE
+    Save to RUBY file instead of printing to stdout
+
   -h --help
     Show this help
 
 Parameters:
-  SVG_FILE
-    Input SVG file
-
   RUBY_FILE
     Output Ruby file. Leave empty to write to stdout
 
 Examples:
-  victor convert example.svg example.rb
+  victor convert example.svg --save example.rb
diff --git a/spec/approvals/cli/convert/usage b/spec/approvals/cli/convert/usage
index 0ae92f2..1a3a995 100644
--- a/spec/approvals/cli/convert/usage
+++ b/spec/approvals/cli/convert/usage
@@ -1,3 +1,3 @@
 Usage:
-  victor convert SVG_FILE [RUBY_FILE --template NAME]
+  victor convert SVG_FILE [--save RUBY_FILE --template NAME]
   victor convert (-h|--help)
diff --git a/spec/approvals/cli/render/help b/spec/approvals/cli/render/help
index 64037e0..d463a39 100644
--- a/spec/approvals/cli/render/help
+++ b/spec/approvals/cli/render/help
@@ -1,7 +1,7 @@
 Render Ruby code to SVG
 
 Usage:
-  victor render RUBY_FILE [SVG_FILE] [options]
+  victor render RUBY_FILE [options] [PARAMS...]
   victor render (-h|--help)
 
 Options:
@@ -12,6 +12,9 @@ Options:
   -w, --watch
     Watch the source file and regenerate on change
 
+  -o, --save SVG_FILE
+    Save to SVG file instead of printing to stdout
+
   -h --help
     Show this help
 
@@ -19,10 +22,12 @@ Parameters:
   RUBY_FILE
     Input Ruby file
 
-  SVG_FILE
-    Output SVG file. Leave empty to write to stdout
+  PARAMS
+    One or more key=value pairs that will be available in the `params` hash for
+    the Ruby script
 
 Examples:
-  victor render input.rb output.svg
-  victor render input.rb output.svg --watch
+  victor render input.rb -o output.svg
+  victor render input.rb --save output.svg --watch
   victor render input.rb --template minimal
+  victor render input.rb color=black "text=Hello World"
diff --git a/spec/approvals/cli/render/svg-code-blue.svg b/spec/approvals/cli/render/svg-code-blue.svg
new file mode 100644
index 0000000..86063a4
--- /dev/null
+++ b/spec/approvals/cli/render/svg-code-blue.svg
@@ -0,0 +1,10 @@
+<svg width="140" height="100" style="background:#ddd" xmlns="http://www.w3.org/2000/svg">
+
+<rect x="10" y="10" width="120" height="80" rx="10" fill="#666"/>
+<circle cx="50" cy="50" r="30" fill="blue"/>
+<circle cx="58" cy="32" r="4" fill="black"/>
+<polygon points="45,50 80,30 80,70" fill="#666"/>
+<circle cx="80" cy="50" r="4" fill="blue"/>
+<circle cx="98" cy="50" r="4" fill="blue"/>
+<circle cx="116" cy="50" r="4" fill="blue"/>
+</svg>
diff --git a/spec/approvals/cli/render/usage b/spec/approvals/cli/render/usage
index 1b84a95..a6ec482 100644
--- a/spec/approvals/cli/render/usage
+++ b/spec/approvals/cli/render/usage
@@ -1,3 +1,3 @@
 Usage:
-  victor render RUBY_FILE [SVG_FILE] [options]
+  victor render RUBY_FILE [options] [PARAMS...]
   victor render (-h|--help)
diff --git a/spec/fixtures/render/pacman_dsl.rb b/spec/fixtures/render/pacman_dsl.rb
index d61305c..08481ec 100644
--- a/spec/fixtures/render/pacman_dsl.rb
+++ b/spec/fixtures/render/pacman_dsl.rb
@@ -1,11 +1,13 @@
+color = params[:color] || :yellow
+
 setup width: '140', height: '100', style: 'background:#ddd'
 
 build do
   rect x: '10', y: '10', width: '120', height: '80', rx: '10', fill: '#666'
-  circle cx: '50', cy: '50', r: '30', fill: 'yellow'
+  circle cx: '50', cy: '50', r: '30', fill: color
   circle cx: '58', cy: '32', r: '4', fill: 'black'
   polygon points: '45,50 80,30 80,70', fill: '#666'
-  circle cx: '80', cy: '50', r: '4', fill: 'yellow'
-  circle cx: '98', cy: '50', r: '4', fill: 'yellow'
-  circle cx: '116', cy: '50', r: '4', fill: 'yellow'
+  circle cx: '80', cy: '50', r: '4', fill: color
+  circle cx: '98', cy: '50', r: '4', fill: color
+  circle cx: '116', cy: '50', r: '4', fill: color
 end
diff --git a/spec/victor-cli/commands/convert_spec.rb b/spec/victor-cli/commands/convert_spec.rb
index 57f817d..687c2c4 100644
--- a/spec/victor-cli/commands/convert_spec.rb
+++ b/spec/victor-cli/commands/convert_spec.rb
@@ -17,17 +17,17 @@
 
   context 'with SVG_FILE' do
     it 'outputs the converted ruby code to stdout' do
-      expect { subject.run ['convert', svg_file] }.to output_approval('cli/convert/ruby-code.rb')
+      expect { subject.run %W[convert #{svg_file}] }.to output_approval('cli/convert/ruby-code.rb')
     end
   end
 
-  context 'with SVG_FILE RUBY_FILE' do
+  context 'with SVG_FILE --save RUBY_FILE' do
     let(:ruby_file) { 'spec/tmp/code.rb' }
 
     before { File.unlink ruby_file if File.exist? ruby_file }
 
     it 'saves the converted ruby code' do
-      expect { subject.run ['convert', svg_file, ruby_file] }.to output_approval('cli/convert/save')
+      expect { subject.run %W[convert #{svg_file} --save #{ruby_file}] }.to output_approval('cli/convert/save')
       expect(File.read ruby_file).to match_approval('cli/convert/ruby-code.rb')
     end
   end
diff --git a/spec/victor-cli/commands/render_spec.rb b/spec/victor-cli/commands/render_spec.rb
index d110cee..7d33243 100644
--- a/spec/victor-cli/commands/render_spec.rb
+++ b/spec/victor-cli/commands/render_spec.rb
@@ -16,7 +16,15 @@
 
   context 'with RUBY_FILE' do
     it 'outputs the converted SVG code to stdout' do
-      expect { subject.execute ['render', ruby_file] }.to output_approval('cli/render/svg-code.svg')
+      expect { subject.execute %W[render #{ruby_file}] }
+        .to output_approval('cli/render/svg-code.svg')
+    end
+  end
+
+  context 'with RUBY_FILE PARAMS...' do
+    it 'passes param pairs to the DSL' do
+      expect { subject.execute %W[render #{ruby_file} color=blue] }
+        .to output_approval('cli/render/svg-code-blue.svg')
     end
   end
 
@@ -46,13 +54,15 @@
     end
   end
 
-  context 'with RUBY_FILE SVG_FILE' do
+  context 'with RUBY_FILE --save SVG_FILE' do
     let(:svg_file) { 'spec/tmp/svg.svg' }
 
     before { File.unlink svg_file if File.exist? svg_file }
 
     it 'saves the converted SVG code' do
-      expect { subject.execute ['render', ruby_file, svg_file] }.to output_approval('cli/render/save')
+      expect { subject.execute %W[render #{ruby_file} --save #{svg_file}] }
+        .to output_approval('cli/render/save')
+
       expect(File.read(svg_file)).to match_approval('cli/render/svg-code.svg')
     end
   end
diff --git a/spec/victor-cli/refinements/pair_split_spec.rb b/spec/victor-cli/refinements/pair_split_spec.rb
new file mode 100644
index 0000000..91ee174
--- /dev/null
+++ b/spec/victor-cli/refinements/pair_split_spec.rb
@@ -0,0 +1,13 @@
+describe PairSplit do
+  using described_class
+
+  subject { ['color=blue', 'text=Hello World'] }
+
+  describe Array do
+    describe '#pair_split' do
+      it 'splits key=value pairs and returns a hash' do
+        expect(subject.pair_split).to eq({ color: 'blue', text: 'Hello World' })
+      end
+    end
+  end
+end
diff --git a/spec/victor-cli/ruby_source_spec.rb b/spec/victor-cli/ruby_source_spec.rb
index 184c781..352ab11 100644
--- a/spec/victor-cli/ruby_source_spec.rb
+++ b/spec/victor-cli/ruby_source_spec.rb
@@ -1,5 +1,5 @@
 describe RubySource do
-  subject { described_class.new code, filename }
+  subject { described_class.new code, filename: filename }
 
   let(:code) { "puts 'hello'" }
   let(:filename) { nil }
diff --git a/victor-cli.gemspec b/victor-cli.gemspec
index 750d994..15f6bfc 100644
--- a/victor-cli.gemspec
+++ b/victor-cli.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.executables = ['victor']
   s.homepage    = 'https://github.com/dannyben/victor-cli'
   s.license     = 'MIT'
-  s.required_ruby_version = '>= 3.1'
+  s.required_ruby_version = '>= 3.2'
 
   s.add_dependency 'colsole', '~> 1.0'
   s.add_dependency 'css_parser', '~> 1.7'
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'requires', '~> 1.0'
   s.add_dependency 'rufo', '~> 0.12'
   s.add_dependency 'victor', '~> 0.4'
-  
+
   # FIXME: Remove when resolved.
   #        This is a sub-dependency of filewatcher which does not bundle logger.
   #        ref: https://github.com/filewatcher/filewatcher/pull/272