diff --git a/vagrant.gemspec b/vagrant.gemspec
index 1981493ff..981ce3ed3 100644
--- a/vagrant.gemspec
+++ b/vagrant.gemspec
@@ -23,6 +23,7 @@ Gem::Specification.new do |s|
   s.add_dependency "hashicorp-checkpoint", "~> 0.1.1"
   s.add_dependency "log4r", "~> 1.1.9", "< 1.1.11"
   s.add_dependency "net-ssh", ">= 2.6.6", "< 2.10.0"
+  s.add_dependency "net-sftp", "~> 2.1"
   s.add_dependency "net-scp", "~> 1.1.0"
   s.add_dependency "rb-kqueue", "~> 0.2.0"
   s.add_dependency "wdm", "~> 0.1.0"