DEV: Fix gemfile

DEV: Fix gemfile

diff --git a/Gemfile b/Gemfile
index f6bd3b2..85c1173 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+source 'https://rubygems.org'
+
 group :development do
   gem 'translations-manager', git: 'https://github.com/discourse/translations-manager.git'
   gem 'rubocop-discourse'

GitHub sha: bd5d9fc2