diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4ae66878..42448d31 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -9,7 +9,7 @@ jobs:
         type: "string"
       ruby:
         description: "Ruby version"
-        default: "2.6.5"
+        default: "2.7.0"
         type: "string"
     docker:
       - image: cimg/ruby:<< parameters.ruby >>
@@ -38,6 +38,7 @@ jobs:
       BUNDLE_GEMFILE: << parameters.gemfile >>
       POSTGRES_PORT: 5432
       FEDORA_6_PORT: 8080
+    resource_class: medium+
     steps:
       - checkout
 
@@ -122,10 +123,6 @@ workflows:
           gemfile: "gemfiles/activerecord_5_2.gemfile"
           ruby: 2.6.5
           name: "Ruby2-6_Rails5-2"
-      - build:
-          gemfile: "gemfiles/activerecord_5_2.gemfile"
-          ruby: 2.5.7
-          name: "Ruby2-5_Rails5-2"
   nightly:
     triggers:
       - schedule:
@@ -159,7 +156,3 @@ workflows:
           gemfile: "gemfiles/activerecord_5_2.gemfile"
           ruby: 2.6.5
           name: "Ruby2-6_Rails5-2"
-      - build:
-          gemfile: "gemfiles/activerecord_5_2.gemfile"
-          ruby: 2.5.7
-          name: "Ruby2-5_Rails5-2"
diff --git a/Rakefile b/Rakefile
index 58acc435..cbef8bf7 100644
--- a/Rakefile
+++ b/Rakefile
@@ -26,7 +26,7 @@ namespace :db do
   end
 
   task configuration: :environment do
-    @config = YAML.safe_load(ERB.new(File.read("db/config.yml")).result, [], [], true)[DATABASE_ENV]
+    @config = YAML.safe_load(ERB.new(File.read("db/config.yml")).result, aliases: true)[DATABASE_ENV]
   end
 
   task configure_connection: :configuration do
diff --git a/spec/support/database_connection.rb b/spec/support/database_connection.rb
index 2e81876c..709311ee 100644
--- a/spec/support/database_connection.rb
+++ b/spec/support/database_connection.rb
@@ -7,7 +7,7 @@ def self.connect!(env)
     # Ref https://github.com/puma/puma#clustered-mode
     ActiveSupport.on_load(:active_record) do
       ::ActiveRecord::Base.connection_pool.disconnect! if ::ActiveRecord::Base.connected?
-      ::ActiveRecord::Base.configurations = YAML.safe_load(ERB.new(File.read("db/config.yml")).result, [], [], true) || {}
+      ::ActiveRecord::Base.configurations = YAML.safe_load(ERB.new(File.read("db/config.yml")).result, aliases: true) || {}
       ::ActiveRecord::Base.establish_connection(DatabaseConnection.database_config(env))
     end
   end