diff --git a/Gemfile.lock b/Gemfile.lock
index 0aec7b99..febea898 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -262,7 +262,7 @@ GEM
       connection_pool (~> 2.2)
     net-http2 (0.18.4)
       http-2 (~> 0.11)
-    net-imap (0.3.7)
+    net-imap (0.4.0)
       date
       net-protocol
     net-pop (0.1.2)