diff --git a/Gemfile b/Gemfile
index e6fe1dc..e36ce3f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -62,3 +62,4 @@ gem 'roo-xls'
 gem 'simple_form'
 gem 'midi-smtp-server', require: false
 gem 'will_paginate', '~> 3.0'
+gem 'whenever', '~> 0.9', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index 3db3cc4..254cbfd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,6 +78,7 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     childprocess (4.1.0)
+    chronic (0.10.2)
     concurrent-ruby (1.1.9)
     crass (1.0.6)
     erubi (1.10.0)
@@ -232,6 +233,8 @@ GEM
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
+    whenever (0.11.0)
+      chronic (>= 0.6.3)
     will_paginate (3.3.1)
     xpath (3.2.0)
       nokogiri (~> 1.8)
@@ -264,6 +267,7 @@ DEPENDENCIES
   web-console (>= 4.1.0)
   webdrivers
   webpacker (~> 5.0)
+  whenever (~> 0.9)
   will_paginate (~> 3.0)
 
 RUBY VERSION