diff --git a/Gemfile.lock b/Gemfile.lock
index 7547085..75d4b8e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -394,7 +394,7 @@ GEM
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     mutex_m (0.3.0)
-    net-imap (0.5.6)
+    net-imap (0.5.7)
       date
       net-protocol
     net-pop (0.1.2)