diff --git a/Gemfile.lock b/Gemfile.lock
index fa5a10e85..d614d87fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ GEM
     mutex_m (0.2.0)
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.4.0.1)
+    net-smtp (0.5.0)
       net-protocol
     netrc (0.11.0)
     nio4r (2.7.1)