diff --git a/Gemfile b/Gemfile
index fe9efa706..776edde77 100644
--- a/Gemfile
+++ b/Gemfile
@@ -36,7 +36,7 @@ gem "simple_captcha2", "0.4.3", require: "simple_captcha"
 # Background processing
 
 gem "redis", "3.3.5" # Pinned to 3.3.x because of https://github.com/antirez/redis/issues/4272
-gem "sidekiq", "5.2.3"
+gem "sidekiq", "5.2.5"
 
 # Scheduled processing
 
diff --git a/Gemfile.lock b/Gemfile.lock
index b6e6dce7a..b1fdf4924 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -495,7 +495,7 @@ GEM
       json-jwt (>= 1.9.0)
       rack
     rack-piwik (0.3.0)
-    rack-protection (2.0.4)
+    rack-protection (2.0.5)
       rack
     rack-rewrite (1.5.1)
     rack-ssl (1.4.1)
@@ -652,8 +652,9 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (3.1.2)
       activesupport (>= 4.0.0)
-    sidekiq (5.2.3)
+    sidekiq (5.2.5)
       connection_pool (~> 2.2, >= 2.2.2)
+      rack (>= 1.5.0)
       rack-protection (>= 1.5.0)
       redis (>= 3.3.5, < 5)
     sidekiq-cron (1.0.4)
@@ -883,7 +884,7 @@ DEPENDENCIES
   sass-rails (= 5.0.7)
   secure_headers (= 6.0.0)
   shoulda-matchers (= 3.1.2)
-  sidekiq (= 5.2.3)
+  sidekiq (= 5.2.5)
   sidekiq-cron (= 1.0.4)
   simple_captcha2 (= 0.4.3)
   simplecov (= 0.16.1)