diff --git a/Gemfile b/Gemfile
index 44fbd42d..e6d9c03b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -76,7 +76,7 @@ gem 'prerender_rails', '~> 1.6.0'
 # http requests made easy
 gem 'http', require: false
 
-gem 'sidekiq', '~> 5.0.2'
+gem 'sidekiq', '~> 6.4.0'
 
 gem 'hashdiff', '~> 0.3.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 74bf5ae3..eaeead98 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -111,8 +111,8 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.5)
-    connection_pool (2.2.2)
+    concurrent-ruby (1.1.9)
+    connection_pool (2.2.5)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     crass (1.0.4)
@@ -249,8 +249,6 @@ GEM
     puma (3.12.1)
     rack (2.0.7)
     rack-cors (1.0.3)
-    rack-protection (2.0.5)
-      rack
     rack-rewrite (1.5.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -298,7 +296,7 @@ GEM
     rb-inotify (0.10.0)
       ffi (~> 1.0)
     rdoc (4.3.0)
-    redis (4.1.0)
+    redis (4.5.1)
     require_all (2.0.0)
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
@@ -357,11 +355,10 @@ GEM
     sexp_processor (4.12.0)
     shoulda-matchers (4.0.1)
       activesupport (>= 4.2.0)
-    sidekiq (5.0.5)
-      concurrent-ruby (~> 1.0)
-      connection_pool (~> 2.2, >= 2.2.0)
-      rack-protection (>= 1.5.0)
-      redis (>= 3.3.4, < 5)
+    sidekiq (6.4.0)
+      connection_pool (>= 2.2.2)
+      rack (~> 2.0)
+      redis (>= 4.2.0)
     simplecov (0.13.0)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
@@ -468,7 +465,7 @@ DEPENDENCIES
   sdoc (~> 0.4.0)
   sentry-raven (~> 2.6.3)
   shoulda-matchers
-  sidekiq (~> 5.0.2)
+  sidekiq (~> 6.4.0)
   sitemap_generator!
   slim-rails
   spring