diff --git a/Gemfile.lock b/Gemfile.lock
index c048fbec..dfa44959 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -134,7 +134,7 @@ GEM
       drb (~> 2.0)
       prism (~> 1.5)
     mustermann (3.1.1)
-    net-imap (0.6.4)
+    net-imap (0.6.4.1)
       date
       net-protocol
     net-pop (0.1.2)