diff --git a/announcement.gemspec b/announcement.gemspec
index 345c609..f5db13a 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -35,7 +35,7 @@ all_template.each do |folder|
         s1 = texts.scan(/{|}/)
         if s1.count % 2 != 0
           i = texts.rindex(s1[-1])
-          texts[i] = ''
+          texts[i] = ""
         end
         regex_pattern = /.response-content {\n  position: relative;\n}\n|.response-content[^{]*{[^}]*@media[^{]*{[^{]*}[^{]*@media[^{]*{[^{]*}[^}]*}[^}]*}/m
         if !texts.include? "$font-h1:"