diff --git a/Gemfile.lock b/Gemfile.lock
index 47fde92..f85d025 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -206,7 +206,7 @@ GEM
       ruby2_keywords (>= 0.0.5)
     mutex_m (0.3.0)
     mysql2 (0.5.6)
-    net-imap (0.5.6)
+    net-imap (0.5.7)
       date
       net-protocol
     net-pop (0.1.2)