diff --git a/Gemfile b/Gemfile
index 58d21ba45..ca99c15a5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,10 +25,10 @@ gem "doorkeeper-i18n", "~> 5.2"
 gem "requestjs-rails", "~> 0.0.13"
 
 #  Ruby Standard Gems
-gem 'csv', '~> 3.3.2'
-gem 'net-imap', '~> 0.5.7'
+gem 'csv', '~> 3.3.5'
+gem 'net-imap', '~> 0.6.1'
 gem 'net-pop', '~> 0.1.2'
-gem 'net-smtp', '~> 0.5.0'
+gem 'net-smtp', '~> 0.5.1'
 gem 'ostruct'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem