diff --git a/lib/ssh_scan/scan_engine.rb b/lib/ssh_scan/scan_engine.rb
index 21e0e961..999e1ba6 100644
--- a/lib/ssh_scan/scan_engine.rb
+++ b/lib/ssh_scan/scan_engine.rb
@@ -96,7 +96,7 @@ def scan_target(socket, opts)
                             target,
                             :port => port,
                             :timeout => timeout,
-                            :paranoid => Net::SSH::Verifiers::Null.new
+                            :paranoid => false
                           )
         raise SSHScan::Error::ClosedConnection.new if net_ssh_session.closed?
         auth_session = Net::SSH::Authentication::Session.new(
diff --git a/ssh_scan.gemspec b/ssh_scan.gemspec
index f90b607a..d0a6a969 100644
--- a/ssh_scan.gemspec
+++ b/ssh_scan.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency('bindata', '2.4.3')
   s.add_dependency('netaddr', '1.5.1')
-  s.add_dependency('net-ssh', '4.2.0')
+  s.add_dependency('net-ssh', '5.0.2')
   s.add_dependency('sshkey')
   s.add_development_dependency('pry', '0.11.3')
   s.add_development_dependency('rspec', '3.7.0')