diff --git a/Gemfile b/Gemfile
index c46b48932d4112dbef865547036714a567d72557..7b2d046bace4eaf78e8bdd700a0c13f1a0c83267 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,7 @@ source "https://rubygems.org"
 gem "amazing_print"
 gem "blather", git: "https://github.com/adhearsion/blather.git", branch: "develop"
 gem "dhall"
+gem "csv"
 gem "em-hiredis"
 gem "em-http-request", git: "https://github.com/singpolyma/em-http-request", branch: "fix-letsencrypt"
 gem "em_promise.rb"