diff --git a/config/database.yml b/config/database.yml
index 4f535df..e5a7c86 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -19,7 +19,7 @@ default: &default
   encoding: unicode
   # For details on connection pooling, see rails configuration guide
   # http://guides.rubyonrails.org/configuring.html#database-pooling
-  pool: 20
+  pool: <%= ENV["DB_POOL"] || ENV['MAX_WORKER_THREADS'] || 20 %>
 
 development:
   <<: *default