diff --git a/Appraisals b/Appraisals
index 68acb48f..d558d257 100644
--- a/Appraisals
+++ b/Appraisals
@@ -5,5 +5,5 @@ appraise 'haml4' do
 end
 
 appraise 'haml5' do
-  gem 'haml', '~> 5.0.0'
+  gem 'haml', '~> 5.1.0'
 end
diff --git a/gemfiles/haml5.gemfile b/gemfiles/haml5.gemfile
index 2b0b198d..1f4d003f 100644
--- a/gemfiles/haml5.gemfile
+++ b/gemfiles/haml5.gemfile
@@ -8,6 +8,6 @@ gem "appraisal"
 gem "overcommit", "0.48.0"
 gem "rubocop", "0.68.1"
 gem "coveralls", require: false
-gem "haml", "~> 5.0.0"
+gem "haml", "~> 5.1.0"
 
 gemspec path: "../"
diff --git a/haml_lint.gemspec b/haml_lint.gemspec
index c3203c08..1448951f 100644
--- a/haml_lint.gemspec
+++ b/haml_lint.gemspec
@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.4.0'
 
-  s.add_dependency 'haml', '>= 4.0', '< 5.1'
+  s.add_dependency 'haml', '>= 4.0', '< 5.2'
   s.add_dependency 'rainbow'
   s.add_dependency 'rake', '>= 10', '< 13'
   s.add_dependency 'rubocop', '>= 0.50.0'
diff --git a/lib/haml_lint/adapter.rb b/lib/haml_lint/adapter.rb
index adb110ee..72d4eb67 100644
--- a/lib/haml_lint/adapter.rb
+++ b/lib/haml_lint/adapter.rb
@@ -19,7 +19,7 @@ def self.detect_class
       version = haml_version
       case version
       when '~> 4.0' then HamlLint::Adapter::Haml4
-      when '~> 5.0' then HamlLint::Adapter::Haml5
+      when '~> 5.0', '~> 5.1' then HamlLint::Adapter::Haml5
       else fail HamlLint::Exceptions::UnknownHamlVersion, "Cannot handle Haml version: #{version}"
       end
     end