diff --git a/.rubocop.yml b/.rubocop.yml
index 8a8e2bb..547737a 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,7 +8,7 @@ require:
 
 AllCops:
   NewCops: enable
-  TargetRubyVersion: '2.4'
+  TargetRubyVersion: '2.7'
   Exclude:
   - vendor/**/*
 
diff --git a/lib/puppet-syntax/templates.rb b/lib/puppet-syntax/templates.rb
index 38c47df..8e840bd 100644
--- a/lib/puppet-syntax/templates.rb
+++ b/lib/puppet-syntax/templates.rb
@@ -73,7 +73,7 @@ def validate_erb(filename)
         erb = if RUBY_VERSION >= '2.6'
                 ERB.new(template, trim_mode: '-')
               else
-                ERB.new(template, nil, '-')
+                ERB.new(template, trim_mode: '-')
               end
         erb.filename = filename
         erb.result