diff --git a/Gemfile b/Gemfile
index c19e6f890..9139e1184 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem "simple_captcha2", "0.4.3", require: "simple_captcha"
 
 # Background processing
 
-gem "sidekiq", "4.2.10"
+gem "sidekiq", "5.0.4"
 
 # Scheduled processing
 
diff --git a/Gemfile.lock b/Gemfile.lock
index ddea815ec..605dd032d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -628,11 +628,11 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    sidekiq (4.2.10)
+    sidekiq (5.0.4)
       concurrent-ruby (~> 1.0)
       connection_pool (~> 2.2, >= 2.2.0)
       rack-protection (>= 1.5.0)
-      redis (~> 3.2, >= 3.2.1)
+      redis (~> 3.3, >= 3.3.3)
     sidekiq-cron (0.6.3)
       rufus-scheduler (>= 3.3.0)
       sidekiq (>= 4.2.1)
@@ -865,7 +865,7 @@ DEPENDENCIES
   sass-rails (= 5.0.6)
   secure_headers (= 3.6.7)
   shoulda-matchers (= 3.1.2)
-  sidekiq (= 4.2.10)
+  sidekiq (= 5.0.4)
   sidekiq-cron (= 0.6.3)
   simple_captcha2 (= 0.4.3)
   simplecov (= 0.12.0)