diff --git a/Gemfile.lock b/Gemfile.lock
index 1af181a..8027097 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -172,7 +172,7 @@ GEM
       net-protocol
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.3.3)
+    net-smtp (0.4.0.1)
       net-protocol
     netrc (0.11.0)
     nio4r (2.6.1)