diff --git a/Gemfile.lock b/Gemfile.lock
index d4669dd..2792a70 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,7 +100,7 @@ GEM
     concurrent-ruby (1.3.1)
     connection_pool (2.4.1)
     crass (1.0.6)
-    date (3.3.4)
+    date (3.4.1)
     docile (1.4.0)
     drb (2.2.1)
     erubi (1.12.0)
@@ -127,7 +127,7 @@ GEM
     mini_mime (1.1.5)
     minitest (5.23.1)
     mutex_m (0.2.0)
-    net-imap (0.4.10)
+    net-imap (0.4.20)
       date
       net-protocol
     net-pop (0.1.2)
@@ -231,7 +231,7 @@ GEM
     sqlite3 (1.6.2-x86_64-linux)
     stringio (3.1.0)
     thor (1.3.1)
-    timeout (0.4.1)
+    timeout (0.4.3)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (3.1.4)