diff --git a/Gemfile b/Gemfile
index 956c5b2..2f3708f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -54,7 +54,7 @@ gem 'dry-monads', '~> 1.1.0'
 
 # background
 gem 'hiredis'
-gem 'sidekiq', ' ~> 5.2'
+gem 'sidekiq', '~> 6.4'
 gem 'sidekiq-scheduler'
 
 # notifications
diff --git a/Gemfile.lock b/Gemfile.lock
index 785d072..0d99798 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -86,7 +86,7 @@ GEM
       adamantium (~> 0.2.0)
       equalizer (~> 0.0.9)
     concurrent-ruby (1.1.7)
-    connection_pool (2.2.3)
+    connection_pool (2.2.5)
     database_cleaner (1.8.5)
     debug_inspector (0.0.3)
     descendants_tracker (0.0.4)
@@ -294,8 +294,6 @@ GEM
     puma (3.12.6)
     raabro (1.3.1)
     rack (2.2.3)
-    rack-protection (2.1.0)
-      rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rainbow (3.0.0)
@@ -303,7 +301,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    redis (4.1.4)
+    redis (4.5.1)
     regexp_parser (1.7.1)
     rexml (3.2.4)
     rinku (2.0.6)
@@ -378,11 +376,10 @@ GEM
     sequel (4.48.0)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sidekiq (5.2.9)
-      connection_pool (~> 2.2, >= 2.2.2)
+    sidekiq (6.4.0)
+      connection_pool (>= 2.2.2)
       rack (~> 2.0)
-      rack-protection (>= 1.5.0)
-      redis (>= 3.3.5, < 4.2)
+      redis (>= 4.2.0)
     sidekiq-scheduler (3.0.1)
       e2mmap
       redis (>= 3, < 5)
@@ -479,7 +476,7 @@ DEPENDENCIES
   semantic_logger
   sequel (~> 4.48.0)
   shotgun
-  sidekiq (~> 5.2)
+  sidekiq (~> 6.4)
   sidekiq-scheduler
   simplecov
   simplecov-json