diff --git a/lib/knockoff/config.rb b/lib/knockoff/config.rb
index 5d29572..d11d0a1 100644
--- a/lib/knockoff/config.rb
+++ b/lib/knockoff/config.rb
@@ -34,7 +34,7 @@ def replica_env_keys
     end
 
     def update_replica_configs(new_configs)
-      ActiveRecord::Base.configurations['knockoff_replicas'].merge(new_configs) if ActiveRecord::Base.configurations['knockoff_replicas'].present?
+      ActiveRecord::Base.configurations.configs_for(env_name: 'knockoff_replicas').merge(new_configs) if ActiveRecord::Base.configurations.configs_for(env_name: 'knockoff_replicas').present?
       @replicas_configurations.each do |key, _config|
         update_replica_config(key, new_configs)
       end