diff --git a/lib/net/http.rb b/lib/net/http.rb
index 552f818..f3ae24f 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -859,6 +859,7 @@ def use_ssl=(flag)
       :@ciphers,
       :@extra_chain_cert,
       :@key,
+      :@security_level,
       :@ssl_timeout,
       :@ssl_version,
       :@min_version,
@@ -876,6 +877,7 @@ def use_ssl=(flag)
       :ciphers,
       :extra_chain_cert,
       :key,
+      :security_level,
       :ssl_timeout,
       :ssl_version,
       :min_version,
@@ -913,6 +915,9 @@ def use_ssl=(flag)
     # (This method is appeared in Michal Rokos's OpenSSL extension.)
     attr_accessor :key
 
+    # Sets the SSL security_level.  See OpenSSL::SSL::SSLContext#security_level=
+    attr_accessor :security_level
+
     # Sets the SSL timeout seconds.
     attr_accessor :ssl_timeout