diff --git a/activerecord/lib/active_record/coders/yaml_column.rb b/activerecord/lib/active_record/coders/yaml_column.rb
index 0f7a14db01b86..a1fcc292c5e08 100644
--- a/activerecord/lib/active_record/coders/yaml_column.rb
+++ b/activerecord/lib/active_record/coders/yaml_column.rb
@@ -11,7 +11,7 @@ def initialize(permitted_classes: [], unsafe_load: nil)
           @unsafe_load = unsafe_load
         end
 
-        if Gem::Version.new(Psych::VERSION) >= "5.1"
+        if Gem::Version.new(Psych::VERSION) >= Gem::Version.new("5.1")
           def dump(object)
             if @unsafe_load.nil? ? ActiveRecord.use_yaml_unsafe_load : @unsafe_load
               ::YAML.dump(object)