diff --git a/Gemfile.lock b/Gemfile.lock
index abbbc11..dea7b26 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     base64 (0.3.0)
     citrus (3.0.2)
     commonmarker (0.23.9)
-    date (3.3.3)
+    date (3.5.1)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     ffi (1.17.2)
@@ -46,12 +46,12 @@ GEM
       hansi (~> 0.2.0)
       mustermann (= 3.0.0)
     mutex_m (0.3.0)
-    net-imap (0.3.4)
+    net-imap (0.5.15)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
-    net-protocol (0.2.1)
+    net-protocol (0.2.2)
       timeout
     net-smtp (0.3.3)
       net-protocol
@@ -78,7 +78,7 @@ GEM
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     sexpr (1.1.0)
-    timeout (0.3.2)
+    timeout (0.6.1)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)