diff --git a/Gemfile b/Gemfile
index fd1bacaf83ecdeff9451d3657690ebbd5686c5c7..054d1c57e613b76638e2d251552c81f97a7015a9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -32,7 +32,7 @@ gem "simple_captcha2", "0.3.4", require: "simple_captcha"
 
 # Background processing
 
-gem "sidekiq", "3.3.4"
+gem "sidekiq", "3.4.1"
 gem "sinatra", "1.4.6"
 
 # Scheduled processing
diff --git a/Gemfile.lock b/Gemfile.lock
index 186183fc20606a874e4fd5b8a24c2e86585fc430..0708938fb002534421b114156ac8734a5bf8cb49 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -650,8 +650,8 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (2.8.0)
       activesupport (>= 3.0.0)
-    sidekiq (3.3.4)
-      celluloid (>= 0.16.0)
+    sidekiq (3.4.1)
+      celluloid (~> 0.16.0)
       connection_pool (>= 2.1.1)
       json
       redis (>= 3.0.6)
@@ -853,7 +853,7 @@ DEPENDENCIES
   sass-rails (= 5.0.1)
   selenium-webdriver (= 2.45.0)
   shoulda-matchers (= 2.8.0)
-  sidekiq (= 3.3.4)
+  sidekiq (= 3.4.1)
   sidetiq (= 0.6.3)
   simple_captcha2 (= 0.3.4)
   simplecov (= 0.10.0)