diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f37ee2b..1ad5f5f1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Return uniqe errors in default error responses
+
 ## 3.1.0
 
 ### openapi_first/test
diff --git a/lib/openapi_first/error_responses/default.rb b/lib/openapi_first/error_responses/default.rb
index 02ee5fd2..0cc18c95 100644
--- a/lib/openapi_first/error_responses/default.rb
+++ b/lib/openapi_first/error_responses/default.rb
@@ -48,7 +48,7 @@ def errors
             key => pointer(error.data_pointer),
             code: error.type
           }
-        end
+        end.uniq
       end
 
       def pointer_key
diff --git a/lib/openapi_first/error_responses/jsonapi.rb b/lib/openapi_first/error_responses/jsonapi.rb
index 8c512f33..2cb629cb 100644
--- a/lib/openapi_first/error_responses/jsonapi.rb
+++ b/lib/openapi_first/error_responses/jsonapi.rb
@@ -27,7 +27,7 @@ def serialized_errors
             title: error.message,
             code: error.type
           }
-        end
+        end.uniq
       end
 
       def default_errors
diff --git a/spec/error_responses/default_spec.rb b/spec/error_responses/default_spec.rb
index c0a839f1..c4da81c8 100644
--- a/spec/error_responses/default_spec.rb
+++ b/spec/error_responses/default_spec.rb
@@ -77,6 +77,32 @@
     end
   end
 
+  context 'with duplicated errors' do
+    subject(:error_response) do
+      error = instance_double(OpenapiFirst::Schema::ValidationError, message: 'hey', data_pointer: '/data', type: 'fail')
+      described_class.new(
+        failure: OpenapiFirst::Failure.new(
+          :invalid_body,
+          errors: [error, error]
+        )
+      )
+    end
+
+    it 'returns unique errors' do
+      response = Rack::MockResponse[*error_response.render]
+      expect(response.status).to eq(400)
+      expect(JSON.parse(response.body, symbolize_names: true).fetch(:errors)).to eq(
+        [
+          {
+            message: 'hey',
+            pointer: '/data',
+            code: 'fail'
+          }
+        ]
+      )
+    end
+  end
+
   context 'with invalid query parameter' do
     let(:schema) do
       {
diff --git a/spec/error_responses/jsonapi_spec.rb b/spec/error_responses/jsonapi_spec.rb
index 737c768b..1685c903 100644
--- a/spec/error_responses/jsonapi_spec.rb
+++ b/spec/error_responses/jsonapi_spec.rb
@@ -17,6 +17,34 @@
     expect(response.content_type).to eq 'application/vnd.api+json'
   end
 
+  context 'with duplicated errors' do
+    subject(:error_response) do
+      error = instance_double(OpenapiFirst::Schema::ValidationError, message: 'hey', data_pointer: '/data', type: 'fail')
+      described_class.new(
+        failure: OpenapiFirst::Failure.new(
+          :invalid_body,
+          errors: [error, error]
+        )
+      )
+    end
+
+    it 'returns unique errors' do
+      response = Rack::MockResponse[*error_response.render]
+      expect(response.status).to eq(400)
+      expect(JSON.parse(response.body, symbolize_names: true).fetch(:errors)).to eq(
+        [
+          {
+            title: 'hey',
+            source: { pointer: '/data' },
+            code: 'fail',
+            status: '400'
+
+          }
+        ]
+      )
+    end
+  end
+
   context 'with invalid body' do
     let(:schema) do
       {