diff --git a/README.md b/README.md
index 59e3542..8ac9d20 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ This method requires a resource as a parameter, and you can pass some options if
 The above example will render the **User** object.
 
     user = User.first
-    respond_with user, on_error: { 
+    respond_with user, on_error: {
     : :unauthorized, detail: 'Invalid user or password' }
 
 The above example will render an **Error** response if an error would occur.
@@ -120,7 +120,7 @@ en:
       forbidden:
         title: Unauthorized
         detail: User is not authorized to use this resource
-      unprocessable_entity:
+      unprocessable_content:
         title: Unprocessable Entity
         details: Cannot process request
       conflict:
diff --git a/lib/json_api_responders.rb b/lib/json_api_responders.rb
index d307972..01b78ff 100644
--- a/lib/json_api_responders.rb
+++ b/lib/json_api_responders.rb
@@ -40,7 +40,7 @@ def record_not_found!(reason)
   end
 
   def parameter_missing!(reason)
-    respond_with_error(:unprocessable_entity, reason.message)
+    respond_with_error(:unprocessable_content, reason.message)
   end
 
   def json_api_parse_options
diff --git a/lib/json_api_responders/responder/actions.rb b/lib/json_api_responders/responder/actions.rb
index ff34270..32fcf3b 100644
--- a/lib/json_api_responders/responder/actions.rb
+++ b/lib/json_api_responders/responder/actions.rb
@@ -15,7 +15,7 @@ def respond_to_show_action
 
       def respond_to_create_action
         if has_errors?
-          self.status ||= :unprocessable_entity
+          self.status ||= :unprocessable_content
           render_error
         else
           self.status ||= :created
@@ -25,7 +25,7 @@ def respond_to_create_action
 
       def respond_to_update_action
         if has_errors?
-          self.status ||= :unprocessable_entity
+          self.status ||= :unprocessable_content
           render_error
         else
           self.status ||= :ok
diff --git a/spec/lib/json_api_responders/responder/actions_spec.rb b/spec/lib/json_api_responders/responder/actions_spec.rb
index 08e10a7..8bae630 100644
--- a/spec/lib/json_api_responders/responder/actions_spec.rb
+++ b/spec/lib/json_api_responders/responder/actions_spec.rb
@@ -16,7 +16,7 @@
       json: {
         errors: [
           {
-            title: 'json_api.errors.unprocessable_entity.title',
+            title: 'json_api.errors.unprocessable_content.title',
             detail: "Name can't be blank",
             source: { parameter: :name, pointer: 'data/attributes/name' }
           }
@@ -60,9 +60,9 @@
       end
 
       context 'when resource invalid' do
-        let(:status) { :unprocessable_entity }
+        let(:status) { :unprocessable_content }
 
-        it 'renders unprocessable_entity' do
+        it 'renders unprocessable_content' do
           expect(controller).to receive(:render).with(error_options)
           responder.respond!
         end
@@ -83,9 +83,9 @@
       end
 
       context 'when resource invalid' do
-        let(:status) { :unprocessable_entity }
+        let(:status) { :unprocessable_content }
 
-        it 'renders unprocessable_entity' do
+        it 'renders unprocessable_content' do
           expect(controller).to receive(:render).with(error_options)
           responder.respond!
         end
@@ -149,9 +149,9 @@
       end
 
       context 'when resource invalid' do
-        let(:status) { :unprocessable_entity }
+        let(:status) { :unprocessable_content }
 
-        it 'renders unprocessable_entity' do
+        it 'renders unprocessable_content' do
           expect(controller).to receive(:render).with(error_options)
           responder.respond!
         end
@@ -172,9 +172,9 @@
       end
 
       context 'when resource invalid' do
-        let(:status) { :unprocessable_entity }
+        let(:status) { :unprocessable_content }
 
-        it 'renders unprocessable_entity' do
+        it 'renders unprocessable_content' do
           expect(controller).to receive(:render).with(error_options)
           responder.respond!
         end
diff --git a/spec/lib/json_api_responders_spec.rb b/spec/lib/json_api_responders_spec.rb
index 160c4e4..7546b92 100644
--- a/spec/lib/json_api_responders_spec.rb
+++ b/spec/lib/json_api_responders_spec.rb
@@ -46,7 +46,7 @@
           content_type: 'application/vnd.api+json',
           json: { errors: [
             { detail: 'Unauthorized' },
-            { title: 'json_api.errors.unprocessable_entity.title',
+            { title: 'json_api.errors.unprocessable_content.title',
               detail: "Name can't be blank",
               source: { parameter: :name, pointer: 'data/attributes/name' } }
           ] }