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-rw-r--r--ext/psych/lib/psych.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/ext/psych/lib/psych.rb b/ext/psych/lib/psych.rb
index c3292d91721..347160e82fb 100644
--- a/ext/psych/lib/psych.rb
+++ b/ext/psych/lib/psych.rb
@@ -233,9 +233,9 @@ require 'psych/class_loader'
module Psych
# The version of libyaml Psych is using
- LIBYAML_VERSION = Psych.libyaml_version.join '.'
+ LIBYAML_VERSION = Psych.libyaml_version.join('.').freeze
# Deprecation guard
- NOT_GIVEN = Object.new
+ NOT_GIVEN = Object.new.freeze
private_constant :NOT_GIVEN
###