diff --git a/Gemfile b/Gemfile
index 158ae2939..89fb63377 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,10 +16,10 @@ gem 'addressable'
 gem 'rubyzip', '~> 2.3.0'
 
 #  Ruby Standard Gems
-gem 'csv', '~> 3.2.6'
-gem 'net-imap', '~> 0.3.4'
+gem 'csv', '~> 3.2.8'
+gem 'net-imap', '~> 0.4.8'
 gem 'net-pop', '~> 0.1.2'
-gem 'net-smtp', '~> 0.3.3'
+gem 'net-smtp', '~> 0.4.0'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :x64_mingw, :mswin]