diff --git a/Gemfile b/Gemfile
index 902b0dbca..7d9d05496 100644
--- a/Gemfile
+++ b/Gemfile
@@ -31,6 +31,7 @@ gem "lookbook", "2.3.11"
 gem "hotwire_combobox"
 
 # Background Jobs
+gem "connection_pool", "~> 2.5" # pin to 2.x; 3.0 breaks sidekiq 8.x
 gem "sidekiq"
 gem "sidekiq-cron"
 gem "sidekiq-unique-jobs"
diff --git a/Gemfile.lock b/Gemfile.lock
index a34a40a24..335ece265 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -141,7 +141,7 @@ GEM
     chunky_png (1.4.0)
     climate_control (1.2.0)
     concurrent-ruby (1.3.6)
-    connection_pool (3.0.2)
+    connection_pool (2.5.5)
     countries (8.0.3)
       unaccent (~> 0.3)
     crack (1.0.0)
@@ -792,6 +792,7 @@ DEPENDENCIES
   brakeman
   capybara
   climate_control
+  connection_pool (~> 2.5)
   countries
   csv
   debug