diff --git a/Gemfile.lock b/Gemfile.lock
index 45e2413e..ee7e82bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -157,7 +157,7 @@ GEM
     mocha (3.1.0)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.8.3)
-    net-imap (0.6.4.1)
+    net-imap (0.6.6)
       date
       net-protocol
     net-pop (0.1.2)
@@ -567,7 +567,7 @@ CHECKSUMS
   minitest (6.0.6) sha256=153ea36d1d987a62942382b61075745042a2b3123b1cd48f4c3675af9cc7d6f1
   mocha (3.1.0) sha256=75f42d69ebfb1f10b32489dff8f8431d37a418120ecdfc07afe3bc183d4e1d56
   msgpack (1.8.3) sha256=8bda4a6428d3244e50d6bd55854d354edbada88a4e1f4f5731a39a0f86bee6a1
-  net-imap (0.6.4.1) sha256=29f0360d75a7efd3539f16ac1957dea5c0a51ddeceb348db4553c3120914ea0d
+  net-imap (0.6.6) sha256=96aa4ee50df3060203e649efc341f53480b791d49e150f2fdebf68beb141a8df
   net-pop (0.1.2) sha256=848b4e982013c15b2f0382792268763b748cce91c9e91e36b0f27ed26420dff3
   net-protocol (0.2.2) sha256=aa73e0cba6a125369de9837b8d8ef82a61849360eba0521900e2c3713aa162a8
   net-smtp (0.5.1) sha256=ed96a0af63c524fceb4b29b0d352195c30d82dd916a42f03c62a3a70e5b70736