diff --git a/Gemfile b/Gemfile
index 18c90f2..f9269db 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ gemspec
 gem "rdf",            github: "ruby-rdf/rdf",      branch: "develop"
 gem "rdf-spec",       github: "ruby-rdf/rdf-spec", branch: "develop"
 gem "rdf-xsd",        github: "ruby-rdf/rdf-xsd",  branch: "develop"
-gem "nokogiri",       '~> 1.13', '>= 1.13.4', platforms: [:mri, :jruby]
+gem "nokogiri",       '~> 1.14', platforms: [:mri, :jruby]
 gem 'equivalent-xml', '~> 0.6'
 
 group :development, :test do
diff --git a/README.md b/README.md
index 36beb04..3c4ad69 100755
--- a/README.md
+++ b/README.md
@@ -399,7 +399,7 @@ The template hash defines four Haml templates:
 ## Dependencies
 * [Ruby](https://ruby-lang.org/) (>= 2.6)
 * [RDF.rb](https://rubygems.org/gems/rdf) (~> 3.2)
-* [Haml](https://rubygems.org/gems/haml) (~> 5.2)
+* [Haml](https://rubygems.org/gems/haml) (>- 5.2, < 7)
 * [HTMLEntities](https://rubygems.org/gems/htmlentities) (~> 4.3)
 * Soft dependency on [Nokogiri](https://rubygems.org/gems/nokogiri) (~> 1.12)
 
diff --git a/lib/rdf/rdfa/writer.rb b/lib/rdf/rdfa/writer.rb
index 97af1fd..50ed098 100644
--- a/lib/rdf/rdfa/writer.rb
+++ b/lib/rdf/rdfa/writer.rb
@@ -721,6 +721,8 @@ def get_curie(resource)
     # @return [String]
     #   Entity-encoded string
     def escape_entities(str)
+      # Haml 6 does escaping
+      return str if Haml.const_defined?(:Template)
       CGI.escapeHTML(str).gsub(/[\n\r]/) {|c| '&#x' + c.unpack('h').first + ';'}
     end
 
@@ -761,7 +763,13 @@ def hamlify(template, locals = {})
       template = template.align_left
       log_debug {"hamlify locals: #{locals.inspect}"}
 
-      Haml::Engine.new(template, @options[:haml_options] || HAML_OPTIONS).render(self, locals) do |*args|
+      haml_opts = @options[:haml_options] || HAML_OPTIONS
+      haml_runner = if Haml.const_defined?(:Template)
+        Haml::Template.new(**haml_opts) {template}
+      else
+        Haml::Engine.new(template, **haml_opts)
+      end
+      haml_runner.render(self, locals) do |*args|
         yield(*args) if block_given?
       end
     rescue Haml::Error => e
diff --git a/lib/rdf/rdfa/writer/haml_templates.rb b/lib/rdf/rdfa/writer/haml_templates.rb
index 8ae19d0..4d20fa1 100644
--- a/lib/rdf/rdfa/writer/haml_templates.rb
+++ b/lib/rdf/rdfa/writer/haml_templates.rb
@@ -10,11 +10,11 @@ class Writer
       doc: %q(
         !!! XML
         !!! 5
-        %html{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}
+        %html{**{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}.compact}
           - if base || title
             %head
               - if base
-                %base{href: base}
+                %base{**{href: base}.compact}
               - if title
                 %title= title
           %body
@@ -33,13 +33,13 @@ class Writer
       # Yield: predicates.each
       subject: %q(
         - if element == :li
-          %li{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}
+          %li{**{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}.compact}
             - if typeof
               %span.type!= typeof
             - predicates.each do |predicate|
               != yield(predicate)
         - else
-          %div{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}
+          %div{**{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}.compact}
             - if typeof
               %span.type!= typeof
             - predicates.each do |predicate|
@@ -53,7 +53,7 @@ class Writer
       # Otherwise, render result
       property_value: %q(
         - if heading_predicates.include?(predicate) && object.literal?
-          %h1{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+          %h1{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
         - else
           %div.property
             %span.label
@@ -63,13 +63,13 @@ class Writer
             - elsif get_curie(object) == 'rdf:nil'
               %span{rel: get_curie(predicate), inlist: ''}
             - elsif object.node?
-              %span{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}= get_curie(object)
+              %span{**{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}.compact}= get_curie(object)
             - elsif object.uri?
-              %a{property: get_curie(predicate), href: object.to_s, inlist: inlist}= object.to_s
+              %a{**{property: get_curie(predicate), href: object.to_s, inlist: inlist}.compact}= object.to_s
             - elsif object.datatype == RDF.XMLLiteral
-              %span{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}<!= get_value(object)
+              %span{**{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}<!= get_value(object)
             - else
-              %span{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+              %span{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
       ),
 
       # Output for multi-valued properties
@@ -84,14 +84,14 @@ class Writer
               - if res = yield(object)
                 != res
               - elsif object.node?
-                %li{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}= get_curie(object)
+                %li{**{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}.compact}= get_curie(object)
               - elsif object.uri?
                 %li
-                  %a{property: get_curie(predicate), href: object.to_s, inlist: inlist}= object.to_s
+                  %a{**{property: get_curie(predicate), href: object.to_s, inlist: inlist}.compact}= object.to_s
               - elsif object.datatype == RDF.XMLLiteral
-                %li{property: get_curie(predicate), lang: get_lang(object), datatype: get_curie(object.datatype), inlist: inlist}<!= get_value(object)
+                %li{**{property: get_curie(predicate), lang: get_lang(object), datatype: get_curie(object.datatype), inlist: inlist}.compact}<!= get_value(object)
               - else
-                %li{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+                %li{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
       ),
     }
 
@@ -106,10 +106,10 @@ class Writer
       doc: %q(
         !!! XML
         !!! 5
-        %html{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}
+        %html{**{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}.compact}
           - if base
             %head
-              %base{href: base}
+              %base{*{href: base}.compact}
           %body
             - subjects.each do |subject|
               != yield(subject)
@@ -121,7 +121,7 @@ class Writer
       # Locals: about, typeof, predicates, :inlist
       # Yield: predicates.each
       subject: %q(
-        %div{rel: rel, resource: (about || resource), typeof: typeof}
+        %div{**{rel: rel, resource: (about || resource), typeof: typeof}.compact}
           - predicates.each do |predicate|
             != yield(predicate)
       ),
@@ -138,13 +138,13 @@ class Writer
       - elsif get_curie(object) == 'rdf:nil'
         %span{rel: get_curie(predicate), inlist: ''}
       - elsif object.node?
-        %span{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}= get_curie(object)
+        %span{**{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}.compact}= get_curie(object)
       - elsif object.uri?
-        %a{property: get_curie(predicate), href: object.to_s, inlist: inlist}= object.to_s
+        %a{**{property: get_curie(predicate), href: object.to_s, inlist: inlist}.compact}= object.to_s
       - elsif object.datatype == RDF.XMLLiteral
-        %span{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}<!= get_value(object)
+        %span{**{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}<!= get_value(object)
       - else
-        %span{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+        %span{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
       )
     }
 
@@ -156,7 +156,7 @@ class Writer
       doc: %q(
         !!! XML
         !!! 5
-        %html{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}
+        %html{**{xmlns: "http://www.w3.org/1999/xhtml", lang: lang, prefix: prefix}.compact}
           - if base || title
             %head
               - if base
@@ -189,21 +189,21 @@ class Writer
       # Yield: predicates.each
       subject: %q(
         - if element == :li
-          %li{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}
+          %li{**{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}.compact}
             - if typeof
               %span.type!= typeof
             %table.properties
               - predicates.each do |predicate|
                 != yield(predicate)
         - elsif rel
-          %td{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}
+          %td{**{rel: rel, resource: (about || resource), typeof: typeof, inlist: inlist}.compact}
             - if typeof
               %span.type!= typeof
             %table.properties
               - predicates.each do |predicate|
                 != yield(predicate)
         - else
-          %div{resource: (about || resource), typeof: typeof, inlist: inlist}
+          %div{**{resource: (about || resource), typeof: typeof, inlist: inlist}.compact}
             - if typeof
               %span.type!= typeof
             %table.properties
@@ -218,7 +218,7 @@ class Writer
       # Otherwise, render result
       property_value: %q(
         - if heading_predicates.include?(predicate) && object.literal?
-          %h1{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+          %h1{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
         - else
           %tr.property
             %td.label
@@ -228,14 +228,14 @@ class Writer
             - elsif get_curie(object) == 'rdf:nil'
               %td{rel: get_curie(predicate), inlist: ''}= "Empty"
             - elsif object.node?
-              %td{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}= get_curie(object)
+              %td{**{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}.compact}= get_curie(object)
             - elsif object.uri?
               %td
-                %a{property: get_curie(predicate), href: object.to_s, inlist: inlist}= object.to_s
+                %a{**{property: get_curie(predicate), href: object.to_s, inlist: inlist}.compact}= object.to_s
             - elsif object.datatype == RDF.XMLLiteral
-              %td{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}<!= get_value(object)
+              %td{**{property: get_curie(predicate), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}<!= get_value(object)
             - else
-              %td{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+              %td{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
       ),
 
       # Output for multi-valued properties
@@ -251,14 +251,14 @@ class Writer
                 - if res = yield(object)
                   != res
                 - elsif object.node?
-                  %li{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}= get_curie(object)
+                  %li{**{property: get_curie(predicate), resource: get_curie(object), inlist: inlist}.compact}= get_curie(object)
                 - elsif object.uri?
                   %li
-                    %a{property: get_curie(predicate), href: object.to_s, inlist: inlist}= object.to_s
+                    %a{**{property: get_curie(predicate), href: object.to_s, inlist: inlist}.compact}= object.to_s
                 - elsif object.datatype == RDF.XMLLiteral
-                  %li{property: get_curie(predicate), lang: get_lang(object), datatype: get_curie(object.datatype), inlist: inlist}<!= get_value(object)
+                  %li{**{property: get_curie(predicate), lang: get_lang(object), datatype: get_curie(object.datatype), inlist: inlist}.compact}<!= get_value(object)
                 - else
-                  %li{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}= escape_entities(get_value(object))
+                  %li{**{property: get_curie(predicate), content: get_content(object), lang: get_lang(object), datatype: get_dt_curie(object), inlist: inlist}.compact}= escape_entities(get_value(object))
       ),
     }
     HAML_TEMPLATES = {base: BASE_HAML, min: MIN_HAML, distiller: DISTILLER_HAML}
diff --git a/rdf-rdfa.gemspec b/rdf-rdfa.gemspec
index 93d272b..7d42129 100755
--- a/rdf-rdfa.gemspec
+++ b/rdf-rdfa.gemspec
@@ -30,7 +30,7 @@ Gem::Specification.new do |gem|
 
   gem.add_runtime_dependency     'rdf',                 '~> 3.2'
   gem.add_runtime_dependency     'rdf-vocab',           '~> 3.2'
-  gem.add_runtime_dependency     'haml',                '~> 5.2'
+  gem.add_runtime_dependency     'haml',                '>= 5.2', "< 7"
   gem.add_runtime_dependency     'rdf-xsd',             '~> 3.2'
   gem.add_runtime_dependency     'rdf-aggregate-repo',  '~> 3.2'
   gem.add_runtime_dependency     'htmlentities',        '~> 4.3'
diff --git a/script/tc b/script/tc
index f04650e..8f0f281 100755
--- a/script/tc
+++ b/script/tc
@@ -92,7 +92,7 @@ options = {
 
 opts = GetoptLong.new(
   ["--help", "-?", GetoptLong::NO_ARGUMENT],
-  ["--dbg", GetoptLong::NO_ARGUMENT],
+  ["--debug", GetoptLong::NO_ARGUMENT],
   ["--format", GetoptLong::REQUIRED_ARGUMENT],
   ["--host-language", "-h", GetoptLong::REQUIRED_ARGUMENT],
   ["--library", GetoptLong::REQUIRED_ARGUMENT],
@@ -107,7 +107,7 @@ def help(options)
   puts "Usage: #{$0} [options] [test-number ...]"
   puts "Options:"
   puts "      --dump:               Dump raw output, otherwise serialize to Ruby"
-  puts "      --dbg:                Display detailed debug output"
+  puts "      --debug:              Display detailed debug output"
   puts "      --expand              Expand graph with vocab_expansion option"
   puts "      --format:             Format for output, defaults to #{options[:format].inspect}"
   puts "      --host-language:      Run for specified host language, defaults to #{options[:host_language]}"
@@ -124,7 +124,7 @@ end
 opts.each do |opt, arg|
   case opt
   when '--help'             then help(options)
-  when '--dbg'              then logger.level = Logger::DEBUG
+  when '--debug'            then logger.level = Logger::DEBUG
   when '--format'           then options[:format] = arg.to_sym
   when '--host-language'    then options[:host_language] = arg
   when '--library'          then options[:library] = arg.to_sym
@@ -142,7 +142,7 @@ result_count = {}
 Fixtures::TestCase.for_specific(options[:host_language], options[:version]) do |tc|
   next unless ARGV.empty? || ARGV.any? {|n| tc.num.match(/#{n}/)}
   next if tc.classification.to_s =~ /deprecated/
-  run_tc(tc, options.merge(result_count: result_count))
+  run_tc(tc, **options.merge(result_count: result_count))
 end
 
 result_count.each do |result, count|