diff --git a/Gemfile.lock b/Gemfile.lock
index 57b8434..a1b047c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -131,7 +131,7 @@ GEM
     msgpack (1.8.0)
     multi_xml (0.8.1)
       bigdecimal (>= 3.1, < 5)
-    net-imap (0.6.3)
+    net-imap (0.6.4)
       date
       net-protocol
     net-pop (0.1.2)