diff --git a/Gemfile b/Gemfile
index 970977f..8058483 100644
--- a/Gemfile
+++ b/Gemfile
@@ -35,7 +35,7 @@ gem 'whenever', '0.9.2'
 
 gem 'redis', '3.2.1'
 # gem 'sinatra', '1.4.6', require: nil
-gem 'sidekiq', '3.5.0'
+gem 'sidekiq', '4.2.10'
 
 # views
 gem 'browser', '0.6.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7888a0c..a2aab0b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -233,23 +233,6 @@ GEM
     byebug (2.7.0)
       columnize (~> 0.3)
       debugger-linecache (~> 1.2)
-    celluloid (0.17.4)
-      celluloid-essentials
-      celluloid-extras
-      celluloid-fsm
-      celluloid-pool
-      celluloid-supervision
-      timers (>= 4.1.1)
-    celluloid-essentials (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-extras (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-fsm (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-pool (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-supervision (0.20.6)
-      timers (>= 4.1.1)
     chronic (0.10.2)
     chunky_png (1.4.0)
     climate_control (0.2.0)
@@ -278,7 +261,7 @@ GEM
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
     concurrent-ruby (1.1.10)
-    connection_pool (2.2.5)
+    connection_pool (2.3.0)
     crass (0.2.1)
     css_parser (1.7.1)
       addressable
@@ -443,6 +426,8 @@ GEM
     quiet_assets (1.0.3)
       railties (>= 3.1, < 5.0)
     rack (1.6.13)
+    rack-protection (3.0.5)
+      rack
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.7.1)
@@ -481,8 +466,6 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redis (3.2.1)
-    redis-namespace (1.6.0)
-      redis (>= 3.0.4)
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
       railties (>= 4.2.0, < 6.0)
@@ -497,12 +480,11 @@ GEM
       nokogumbo (= 1.1.9)
     sass (3.4.1)
     seedbank (0.3.0)
-    sidekiq (3.5.0)
-      celluloid (~> 0.17.0)
+    sidekiq (4.2.10)
+      concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
-      json (~> 1.0)
+      rack-protection (>= 1.5.0)
       redis (~> 3.2, >= 3.2.1)
-      redis-namespace (~> 1.5, >= 1.5.2)
     slim (3.0.6)
       temple (~> 0.7.3)
       tilt (>= 1.3.3, < 2.1)
@@ -531,7 +513,6 @@ GEM
     thor (0.19.4)
     thread_safe (0.3.6)
     tilt (1.4.1)
-    timers (4.3.5)
     truncato (0.7.10)
       htmlentities (~> 4.3.1)
       nokogiri (~> 1.8.0, >= 1.7.0)
@@ -620,7 +601,7 @@ DEPENDENCIES
   sass (= 3.4.1)
   sass-rails!
   seedbank (= 0.3.0)
-  sidekiq (= 3.5.0)
+  sidekiq (= 4.2.10)
   simple_sort!
   slim (= 3.0.6)
   slim-rails (= 0.2.1)