diff --git a/Appraisals b/Appraisals
deleted file mode 100644
index 646795d..0000000
--- a/Appraisals
+++ /dev/null
@@ -1,19 +0,0 @@
-
-appraise "rails7.2" do
-  gem "rails", "~> 7.2"
-  gem "mongoid", "~> 9"
-  gem "sqlite3"
-end
-
-appraise "rails8.0" do
-  gem "rails", "~> 8.0.0"
-  gem "mongoid", "~> 9"
-  gem "sqlite3"
-end
-
-appraise "rails8.1" do
-  gem "rails", "~> 8.1.0"
-  gem "mongoid", "~> 9"
-  gem "sqlite3"
-end
-
diff --git a/lib/tiddle/strategy.rb b/lib/tiddle/strategy.rb
index 69e99bd..8a7fb18 100644
--- a/lib/tiddle/strategy.rb
+++ b/lib/tiddle/strategy.rb
@@ -53,7 +53,11 @@ def model_name
       end
 
       def authentication_keys
-        mapping.to.authentication_keys
+        if mapping.to.authentication_keys.is_a?(Hash)
+          mapping.to.authentication_keys.keys
+        else
+          mapping.to.authentication_keys
+        end
       end
 
       def touch_token(token)
diff --git a/spec/strategy_spec.rb b/spec/strategy_spec.rb
index 87e20a2..9418153 100644
--- a/spec/strategy_spec.rb
+++ b/spec/strategy_spec.rb
@@ -181,6 +181,35 @@
     end
   end
 
+  describe "when authentication_keys is a hash" do
+    before do
+      Devise.setup do |config|
+        config.authentication_keys = { email: true }
+      end
+
+      @user = User.create!(
+        email: "test@example.com",
+        password: "12345678"
+      )
+      @token = Tiddle.create_and_return_token(@user, FakeRequest.new)
+    end
+
+    after do
+      Devise.setup do |config|
+        config.authentication_keys = [:email]
+      end
+    end
+
+    it "allows to access endpoints which require authentication with valid \
+      nick name and token" do
+      get(
+        secrets_path,
+        headers: { "X-USER-EMAIL" => "test@example.com", "X-USER-TOKEN" => @token }
+      )
+      expect(response.status).to eq 200
+    end
+  end
+
   context "when token has expires_in set up" do
     before do
       @user = User.create!(email: "test@example.com", password: "12345678")
diff --git a/spec/support/backend.rb b/spec/support/backend.rb
index 48ae73c..1a0c556 100644
--- a/spec/support/backend.rb
+++ b/spec/support/backend.rb
@@ -23,11 +23,7 @@ def migrate!
       # Do initial migration
       path = File.expand_path("../rails_app_active_record/db/migrate/", File.dirname(__FILE__))
 
-      schema_migration = ::ActiveRecord::SchemaMigration.new(
-        ActiveRecord::Tasks::DatabaseTasks.migration_connection_pool
-      )
-
-      ::ActiveRecord::MigrationContext.new(path, schema_migration).migrate
+      ActiveRecord::MigrationContext.new(path).migrate
     end
   end
 
diff --git a/tiddle.gemspec b/tiddle.gemspec
index 3d6f06b..44a6d74 100644
--- a/tiddle.gemspec
+++ b/tiddle.gemspec
@@ -23,9 +23,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 13"
   spec.add_development_dependency "rspec-rails"
   spec.add_development_dependency "simplecov"
-  spec.add_development_dependency "appraisal"
   spec.add_development_dependency "rubocop"
-  spec.add_development_dependency "database_cleaner"
   spec.add_development_dependency "database_cleaner-active_record"
   spec.add_development_dependency "database_cleaner-mongoid"
 end