diff --git a/Gemfile b/Gemfile
index 674e85fe3..f9fa4884c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,7 +24,7 @@ gem 'httparty'
 gem 'recaptcha', require: "recaptcha/rails"
 gem 'webpacker', '>= 4.0.x'
 gem 'retriable'
-gem 'sidekiq'
+gem 'sidekiq', '~> 6.0'
 gem 'marcel'
 # bookmarks for later, if they are needed
 # gem 'sidekiq-worker-killer'
diff --git a/Gemfile.lock b/Gemfile.lock
index ba15723c4..c97a5ca56 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -436,7 +436,7 @@ DEPENDENCIES
   sanitize
   shoulda-context
   shoulda-matchers
-  sidekiq
+  sidekiq (~> 6.0)
   sidekiq-unique-jobs
   simple_form
   solargraph