diff --git a/sample_app/Gemfile b/sample_app/Gemfile
index a2f2ab7..91efe61 100644
--- a/sample_app/Gemfile
+++ b/sample_app/Gemfile
@@ -9,7 +9,7 @@ gem "faker", "1.9.1"
 gem "figaro", "~> 1.1", ">= 1.1.1"
 gem "kaminari"
 gem "mini_magick", "~> 4.8"
-gem "sidekiq", "~> 5.0", ">= 5.0.5"
+gem "sidekiq", "~> 6.4"
 
 gem "puma", "~> 3.11"
 gem "rails", "~> 5.2.0"
diff --git a/sample_app/Gemfile.lock b/sample_app/Gemfile.lock
index fc6bd39..4b87a7f 100644
--- a/sample_app/Gemfile.lock
+++ b/sample_app/Gemfile.lock
@@ -71,12 +71,12 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.9)
     config (1.7.0)
       activesupport (>= 3.0)
       deep_merge (~> 1.2.1)
       dry-validation (>= 0.10.4)
-    connection_pool (2.2.2)
+    connection_pool (2.2.5)
     crass (1.0.4)
     deep_merge (1.2.1)
     domain_name (0.5.20180417)
@@ -315,7 +315,9 @@ GEM
     mime-types (3.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2016.0521)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.8.0)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -334,9 +336,7 @@ GEM
     popper_js (1.12.9)
     powerpack (0.1.2)
     puma (3.11.4)
-    rack (2.0.5)
-    rack-protection (2.0.3)
-      rack
+    rack (2.2.3)
     rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rails (5.2.0)
@@ -376,7 +376,7 @@ GEM
       json (>= 1.8)
       nokogiri (~> 1.5)
       trollop (~> 2.1)
-    redis (4.0.1)
+    redis (4.5.1)
     rest-client (2.0.2)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
@@ -401,11 +401,10 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    sidekiq (5.1.3)
-      concurrent-ruby (~> 1.0)
-      connection_pool (~> 2.2, >= 2.2.0)
-      rack-protection (>= 1.5.0)
-      redis (>= 3.3.5, < 5)
+    sidekiq (6.4.0)
+      connection_pool (>= 2.2.2)
+      rack (~> 2.0)
+      redis (>= 4.2.0)
     spring (2.0.2)
       activesupport (>= 4.2)
     spring-watcher-listen (2.0.1)
@@ -468,7 +467,7 @@ DEPENDENCIES
   rails (~> 5.2.0)
   rubocop (~> 0.54.0)
   sass-rails (~> 5.0)
-  sidekiq (~> 5.0, >= 5.0.5)
+  sidekiq (~> 6.4)
   spring
   spring-watcher-listen (~> 2.0.0)
   sqlite3