diff --git a/Gemfile.lock b/Gemfile.lock
index 573a015..3246055 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
     crass (1.0.6)
-    date (3.3.4)
+    date (3.4.1)
     drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)
@@ -113,7 +113,7 @@ GEM
     mini_portile2 (2.8.5)
     minitest (5.22.2)
     mutex_m (0.2.0)
-    net-imap (0.4.10)
+    net-imap (0.4.20)
       date
       net-protocol
     net-pop (0.1.2)
@@ -175,7 +175,7 @@ GEM
     rubyzip (2.3.2)
     stringio (3.1.0)
     thor (1.3.1)
-    timeout (0.4.1)
+    timeout (0.4.3)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     webrick (1.8.1)