diff --git a/.ci.gemfile b/.ci.gemfile
index f6fb908..a35e916 100644
--- a/.ci.gemfile
+++ b/.ci.gemfile
@@ -8,7 +8,6 @@ gem 'builder'
 gem 'creole'
 gem 'erubi'
 gem 'erubis'
-gem 'haml', '>= 4'
 gem 'liquid'
 gem 'livescript'
 gem 'markaby'
@@ -41,6 +40,12 @@ else
   gem 'maruku'
 end
 
+if RUBY_ENGINE == 'jruby'
+  gem 'haml', '< 6'
+else
+  gem 'haml', '>= 4'
+end
+
 if RUBY_VERSION >= '3.1'
   gem 'sass-embedded'
 elsif RUBY_ENGINE == 'jruby'