diff --git a/lib/line/bot/v2/reserved_words.rb b/lib/line/bot/v2/reserved_words.rb
index 66248b78..e732619f 100644
--- a/lib/line/bot/v2/reserved_words.rb
+++ b/lib/line/bot/v2/reserved_words.rb
@@ -3,8 +3,48 @@ module Bot
     module V2
       # CodeGen add _ prefix to reserved words
       # see: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractRubyCodegen.java
-      RESERVED_WORDS = %i[__FILE__ and def end in or self unless __LINE__ begin defined? ensure module redo super until BEGIN break do false next rescue then when END case else for nil retry true
-                          while alias class elsif if not return undef yield]
+      RESERVED_WORDS = %i[
+        __FILE__
+        and
+        def
+        end
+        in
+        or
+        self
+        unless
+        __LINE__
+        begin
+        defined?
+        ensure
+        module
+        redo
+        super
+        until
+        BEGIN
+        break
+        do
+        false
+        next
+        rescue
+        then
+        when
+        END
+        case
+        else
+        for
+        nil
+        retry
+        true
+        while
+        alias
+        class
+        elsif
+        if
+        not
+        return
+        undef
+        yield
+      ]
     end
   end
 end