diff --git a/Gemfile b/Gemfile
index 9fa381090..fae83f6a2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -95,7 +95,7 @@ gem "rouge", "~> 3.30" # A pure-ruby code highlighter
 gem "rss", "~> 0.2.9" # Ruby's standard library for RSS
 gem "rubyzip", "~> 2.3" # Rubyzip is a ruby library for reading and writing zip files
 gem "s3_direct_upload", "~> 0.1" # Direct Upload to Amazon S3
-gem "sidekiq", "~> 6.5.1" # Sidekiq is used to process background jobs with the help of Redis
+gem "sidekiq", "~> 6.5.3" # Sidekiq is used to process background jobs with the help of Redis
 gem "sidekiq-cron", "~> 1.7" # Allows execution of scheduled cron jobs as specific times
 gem "sidekiq-unique-jobs", "~> 7.1.27" # Ensures that Sidekiq jobs are unique when enqueued
 gem "slack-notifier", "~> 2.4" # A slim ruby wrapper for posting to slack webhooks
diff --git a/Gemfile.lock b/Gemfile.lock
index 0ceb3197e..868cd2d7b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -817,10 +817,10 @@ GEM
     shellany (0.0.1)
     shoulda-matchers (5.1.0)
       activesupport (>= 5.2.0)
-    sidekiq (6.5.1)
+    sidekiq (6.5.3)
       connection_pool (>= 2.2.2)
       rack (~> 2.0)
-      redis (>= 4.2.0)
+      redis (>= 4.5.0)
     sidekiq-cron (1.7.0)
       fugit (~> 1)
       sidekiq (>= 4.2.1)
@@ -1082,7 +1082,7 @@ DEPENDENCIES
   s3_direct_upload (~> 0.1)
   sassc-rails (~> 2.1.2)
   shoulda-matchers (~> 5.1.0)
-  sidekiq (~> 6.5.1)
+  sidekiq (~> 6.5.3)
   sidekiq-cron (~> 1.7)
   sidekiq-unique-jobs (~> 7.1.27)
   simplecov (~> 0.21.2)
diff --git a/vendor/cache/sidekiq-6.5.1.gem b/vendor/cache/sidekiq-6.5.1.gem
deleted file mode 100644
index 07f1c2786..000000000
Binary files a/vendor/cache/sidekiq-6.5.1.gem and /dev/null differ
diff --git a/vendor/cache/sidekiq-6.5.3.gem b/vendor/cache/sidekiq-6.5.3.gem
new file mode 100644
index 000000000..a812d4eac
Binary files /dev/null and b/vendor/cache/sidekiq-6.5.3.gem differ