diff --git a/Gemfile b/Gemfile
index 05b92067..70cf0b3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -127,4 +127,6 @@ gem 'harmonious_dictionary', '~> 0.0.1'
 
 gem 'parallel', '~> 1.19', '>= 1.19.1'
 
+gem 'letter_avatar'
+
 gem 'cd'