diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d0a5441..f756624 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -25,6 +25,7 @@ jobs:
           - haml6.0
           - haml6.1
           - haml6.2
+          - haml6.3
           - rubocop1.0
         os:
           - ubuntu
diff --git a/Appraisals b/Appraisals
index d6650b1..72682e5 100644
--- a/Appraisals
+++ b/Appraisals
@@ -31,6 +31,10 @@ appraise 'haml6.2' do
   gem 'haml', '~> 6.2.0'
 end
 
+appraise 'haml6.3' do
+  gem 'haml', '~> 6.3.0'
+end
+
 appraise 'rubocop1.0' do
   gem 'rubocop', '~> 1.0.0'
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c3bef0..fa11a03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
 # HAML-Lint Changelog
 
+### main
+
+* Add Haml 6.3 compatibility
+
 ### 0.51.0
 
-* Allow HAML > 6.1
+* Allow Haml > 6.1
 
 ### 0.50.0
 
diff --git a/gemfiles/haml6.3.gemfile b/gemfiles/haml6.3.gemfile
new file mode 100644
index 0000000..5c26d55
--- /dev/null
+++ b/gemfiles/haml6.3.gemfile
@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rake"
+gem "rspec", "~> 3.8"
+gem "rspec-its", "~> 1.0"
+gem "appraisal"
+gem "overcommit", "0.60.0"
+gem "rubocop", "1.57.2"
+gem "simplecov", "~> 0.22.0"
+gem "simplecov-lcov", "~> 0.8.0"
+gem "haml", "~> 6.3.0"
+
+gemspec path: "../"
diff --git a/lib/haml_lint/adapter.rb b/lib/haml_lint/adapter.rb
index 9f1d2ba..b868af5 100644
--- a/lib/haml_lint/adapter.rb
+++ b/lib/haml_lint/adapter.rb
@@ -21,7 +21,7 @@ def self.detect_class
       case version
       when '~> 4.0' then HamlLint::Adapter::Haml4
       when '~> 5.0', '~> 5.1', '~> 5.2' then HamlLint::Adapter::Haml5
-      when '~> 6.0', '~> 6.0.a', '~> 6.1', '~> 6.2' then HamlLint::Adapter::Haml6
+      when '~> 6.0', '~> 6.0.a', '~> 6.1', '~> 6.2', '~> 6.3' then HamlLint::Adapter::Haml6
       else fail HamlLint::Exceptions::UnknownHamlVersion, "Cannot handle Haml version: #{version}"
       end
     end