diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 472f793..8364ff8 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -9,14 +9,13 @@ jobs:
 
     strategy:
       matrix:
-        ruby-version: ['2.4.0', '2.5.1', '2.6.6', '2.7.2']
+        ruby-version: ['2.6.10', '2.7.8', '3.0.6', '3.1.4']
 
     steps:
       # Pin to this commit: v2
       - uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
       - name: Set up Ruby
-        # Lock to this commit, v1.82.0
-        uses: ruby/setup-ruby@5e4f0a10bfc39c97cd5358121291e27e5d97e09b
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
diff --git a/.ruby-version b/.ruby-version
index 37c2961..6a81b4c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.7.2
+2.7.8
diff --git a/knockoff.gemspec b/knockoff.gemspec
index 539ed4f..580dd3f 100644
--- a/knockoff.gemspec
+++ b/knockoff.gemspec
@@ -18,8 +18,8 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency 'activerecord', '>= 4.0.0', '< 6.1'
-  spec.add_runtime_dependency 'activesupport', '>= 4.0.0', '< 6.1'
+  spec.add_runtime_dependency 'activerecord', '>= 6', '< 7'
+  spec.add_runtime_dependency 'activesupport', '>= 6', '< 7'
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake", "~> 10.0"
diff --git a/lib/knockoff/config.rb b/lib/knockoff/config.rb
index 5d29572..74adea9 100644
--- a/lib/knockoff/config.rb
+++ b/lib/knockoff/config.rb
@@ -34,9 +34,12 @@ 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?
+      if ActiveRecord::Base.configurations.configs_for(env_name: 'knockoff_replicas').present?
+        updated_config = new_configs.deep_dup.merge!(ActiveRecord::Base.configurations.configs_for(env_name: 'knockoff_replicas').first.configuration_hash)
+      end
+
       @replicas_configurations.each do |key, _config|
-        update_replica_config(key, new_configs)
+        update_replica_config(key, updated_config)
       end
     end
 
@@ -49,9 +52,10 @@ def properly_configured?
 
     private
 
-    def update_replica_config(key, new_configs)
-      @replicas_configurations[key].merge!(new_configs)
-      ActiveRecord::Base.configurations[key].merge!(new_configs)
+    def update_replica_config(key, updated_config)
+      merged_config = @replicas_configurations[key].configuration_hash.deep_dup.merge!(updated_config)
+      @replicas_configurations[key] = ActiveRecord::DatabaseConfigurations::HashConfig.new(key, key, merged_config)
+      ActiveRecord::Base.configurations.configurations << @replicas_configurations[key]
     end
 
     def set_replica_configs
@@ -63,56 +67,11 @@ def parse_knockoff_replica_envs_to_configs
       # and don't add the uri to the final list if it can't be parsed
       replica_env_keys.map.with_index(0) do |env_key, index|
         begin
-          uri = URI.parse(ENV[env_key])
 
           # Configure parameters such as prepared_statements, pool, reaping_frequency for all replicas.
-          replica_config = ActiveRecord::Base.configurations['knockoff_replicas'] || {}
-
-          adapter =
-            if uri.scheme == "postgres"
-              'postgresql'
-            else
-              uri.scheme
-            end
-
-          # Base config from the ENV uri. Sqlite is a special case
-          # and all others follow 'normal' config
-          uri_config =
-            if uri.scheme == 'sqlite3'
-              {
-                'adapter' => adapter,
-                'database' => uri.to_s.split(':')[1]
-              }
-            else
-              {
-                'adapter' => adapter,
-                'database' => (uri.path || "").split("/")[1],
-                'username' => uri.user,
-                'password' => uri.password,
-                'host' => uri.host,
-                'port' => uri.port
-              }
-            end
-
-          # Store the hash in configuration and use it when we establish the connection later.
-          # TODO: In ActiveRecord >= 6, this is a deprecated way to set a configuration. However
-          # there appears to be an issue when calling `ActiveRecord::Base.configurations.to_h` in
-          # version 6.0.4.8 where
-          # multi-database setup is being ignored / dropped. For example if a database.yml setup
-          # has something like..
-          #
-          # development:
-          #   primary:
-          #     ...
-          #   other:
-          #     ...
-          #
-          # then the 'other' database configuration is being dropped.
-          key = "knockoff_replica_#{index}"
-          config = replica_config.merge(uri_config)
-          ActiveRecord::Base.configurations[key] = config
-
-          @replicas_configurations[key] = config
+          to_copy = ActiveRecord::Base.configurations.configs_for(env_name: 'knockoff_replicas')&.first&.configuration_hash || {}
+          register_replica_copy(index, env_key, to_copy)
+
         rescue URI::InvalidURIError
           Rails.logger.info "LOG NOTIFIER: Invalid URL specified in follower_env_keys. Not including URI, which may result in no followers used." # URI is purposely not printed to logs
           # Return a 'nil' which will be removed from
@@ -122,5 +81,35 @@ def parse_knockoff_replica_envs_to_configs
         end
       end.compact
     end
+
+    def register_replica_copy(index, env_key, configuration_hash)
+      key = "knockoff_replica_#{index}"
+      new_config = create_replica_copy(env_key, key, configuration_hash.deep_dup)
+      ActiveRecord::Base.configurations.configurations << new_config
+      @replicas_configurations[key] = new_config
+    end
+
+    def create_replica_copy(env_key, key, replica_config_hash)
+      uri = URI.parse(ENV[env_key])
+
+      replica_config_hash[:adapter] =
+        if uri.scheme == "postgres"
+          'postgresql'
+        else
+          uri.scheme
+        end
+
+      if uri.scheme == 'sqlite3'
+        replica_config_hash[:database] = uri.to_s.split(':')[1]
+      else
+        replica_config_hash[:database] = (uri.path || "").split("/")[1]
+        replica_config_hash[:username] = uri.user
+        replica_config_hash[:password] = uri.password
+        replica_config_hash[:host] = uri.host
+        replica_config_hash[:port] = uri.port
+      end
+
+      ActiveRecord::DatabaseConfigurations::HashConfig.new(key, key, replica_config_hash)
+    end
   end
 end
diff --git a/lib/knockoff/replica_connection_pool.rb b/lib/knockoff/replica_connection_pool.rb
index 2274720..b9381c0 100644
--- a/lib/knockoff/replica_connection_pool.rb
+++ b/lib/knockoff/replica_connection_pool.rb
@@ -52,7 +52,7 @@ def connection_class(config_key)
         class #{class_name} < ActiveRecord::Base
           self.abstract_class = true
           establish_connection :#{config_key}
-          def self.connection_config
+          def self.connection_db_config
             configurations[#{config_key.to_s.inspect}]
           end
         end
diff --git a/lib/knockoff/version.rb b/lib/knockoff/version.rb
index 3e59ef7..dfd1bc3 100644
--- a/lib/knockoff/version.rb
+++ b/lib/knockoff/version.rb
@@ -1,3 +1,3 @@
 module Knockoff
-  VERSION = '1.3.0'.freeze
+  VERSION = '1.4.0'.freeze
 end
diff --git a/spec/knockoff_spec.rb b/spec/knockoff_spec.rb
index d82bfb3..502d299 100644
--- a/spec/knockoff_spec.rb
+++ b/spec/knockoff_spec.rb
@@ -140,9 +140,9 @@ class ActiveRecord::Relation
       Knockoff.clear_all_active_connections!
     end
 
-    it 'defines self.connection_config' do
-      expect(Knockoff::KnockoffReplica0.connection_config).not_to be_nil
-      expect(Knockoff::KnockoffReplica0.connection_config['adapter']).to eq 'sqlite3'
+    it 'defines self.connection_db_config' do
+      expect(Knockoff::KnockoffReplica0.connection_db_config).not_to be_nil
+      expect(Knockoff::KnockoffReplica0.connection_db_config[:adapter]).to eq 'sqlite3'
     end
 
     context "bad configurations" do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 454f2ba..8abea9a 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,9 +5,9 @@
 
 require 'knockoff'
 
-ActiveRecord::Base.configurations = {
-  'test' => { 'adapter' => 'sqlite3', 'database' => 'tmp/test_db' }
-}
+ActiveRecord::Base.configurations = ActiveRecord::DatabaseConfigurations.new({
+  :test => { :adapter => 'sqlite3', :database => 'tmp/test_db' }
+})
 
 # Setup the ENV's for replicas
 ENV['KNOCKOFF_REPLICA1'] = 'sqlite3:tmp/test_replica_db'
@@ -29,4 +29,4 @@ class User < ActiveRecord::Base
 User.create
 
 # Reconnect to primary
-ActiveRecord::Base.establish_connection(:test)
\ No newline at end of file
+ActiveRecord::Base.establish_connection(:test)