diff --git a/app/controllers/api/v2/search_controller.rb b/app/controllers/api/v2/search_controller.rb
index 3ca13cc42..c00ddf92c 100644
--- a/app/controllers/api/v2/search_controller.rb
+++ b/app/controllers/api/v2/search_controller.rb
@@ -20,7 +20,7 @@ class Api::V2::SearchController < Api::BaseController
     @search = Search.new(search_results)
     render json: @search, serializer: REST::SearchSerializer
   rescue Mastodon::SyntaxError
-    unprocessable_entity
+    unprocessable_content
   rescue ActiveRecord::RecordNotFound
     not_found
   end
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 42abe9904..82d9e8380 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -28,7 +28,7 @@ class ApplicationController < ActionController::Base
   rescue_from Mastodon::NotPermittedError, with: :forbidden
   rescue_from ActionController::RoutingError, ActiveRecord::RecordNotFound, with: :not_found
   rescue_from ActionController::UnknownFormat, with: :not_acceptable
-  rescue_from ActionController::InvalidAuthenticityToken, with: :unprocessable_entity
+  rescue_from ActionController::InvalidAuthenticityToken, with: :unprocessable_content
   rescue_from Mastodon::RateLimitExceededError, with: :too_many_requests
 
   rescue_from(*Mastodon::HTTP_CONNECTION_ERRORS, with: :internal_server_error)
@@ -123,7 +123,7 @@ class ApplicationController < ActionController::Base
     respond_with_error(410)
   end
 
-  def unprocessable_entity
+  def unprocessable_content
     respond_with_error(422)
   end
 
diff --git a/app/controllers/settings/two_factor_authentication/webauthn_credentials_controller.rb b/app/controllers/settings/two_factor_authentication/webauthn_credentials_controller.rb
index b01f08ed8..83dedb411 100644
--- a/app/controllers/settings/two_factor_authentication/webauthn_credentials_controller.rb
+++ b/app/controllers/settings/two_factor_authentication/webauthn_credentials_controller.rb
@@ -52,7 +52,7 @@ module Settings
             end
           else
             flash[:error] = I18n.t('webauthn_credentials.create.error')
-            status = :unprocessable_entity
+            status = :unprocessable_content
           end
         else
           flash[:error] = t('webauthn_credentials.create.error')
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
index cd4181a00..ea182a047 100644
--- a/spec/controllers/application_controller_spec.rb
+++ b/spec/controllers/application_controller_spec.rb
@@ -219,16 +219,16 @@ RSpec.describe ApplicationController do
     it_behaves_like 'error response', 410
   end
 
-  describe 'unprocessable_entity' do
+  describe 'unprocessable_content' do
     controller do
-      def route_unprocessable_entity
-        unprocessable_entity
+      def route_unprocessable_content
+        unprocessable_content
       end
     end
 
     subject do
-      routes.draw { get 'route_unprocessable_entity' => 'anonymous#route_unprocessable_entity' }
-      get 'route_unprocessable_entity'
+      routes.draw { get 'route_unprocessable_content' => 'anonymous#route_unprocessable_content' }
+      get 'route_unprocessable_content'
     end
 
     it_behaves_like 'error response', 422
diff --git a/spec/requests/api/v2/search_spec.rb b/spec/requests/api/v2/search_spec.rb
index 9c9f37e09..6beab4c8c 100644
--- a/spec/requests/api/v2/search_spec.rb
+++ b/spec/requests/api/v2/search_spec.rb
@@ -98,7 +98,7 @@ RSpec.describe 'Search API' do
       context 'when search raises syntax error' do
         before { allow(Search).to receive(:new).and_raise(Mastodon::SyntaxError) }
 
-        it 'returns http unprocessable_entity' do
+        it 'returns http unprocessable_content' do
           get '/api/v2/search', headers: headers, params: params
 
           expect(response).to have_http_status(422)