diff --git a/ngraph/src/ngraph/frontend/onnx_import/CMakeLists.txt b/ngraph/src/ngraph/frontend/onnx_import/CMakeLists.txt
index bdf4142ec5e..1400d1ec51d 100644
--- a/ngraph/src/ngraph/frontend/onnx_import/CMakeLists.txt
+++ b/ngraph/src/ngraph/frontend/onnx_import/CMakeLists.txt
@@ -42,7 +42,6 @@ add_library(onnx_importer SHARED
         exceptions.cpp
         exceptions.hpp
         op/acos.hpp
-        op/acosh.cpp
         op/acosh.hpp
         op/add.hpp
         op/add.cpp
diff --git a/ngraph/src/ngraph/frontend/onnx_import/default_opset.hpp b/ngraph/src/ngraph/frontend/onnx_import/default_opset.hpp
index 7ecd525487b..33003443db4 100644
--- a/ngraph/src/ngraph/frontend/onnx_import/default_opset.hpp
+++ b/ngraph/src/ngraph/frontend/onnx_import/default_opset.hpp
@@ -1,9 +1,9 @@
-#include "ngraph/opsets/opset3.hpp"
+#include "ngraph/opsets/opset4.hpp"
 
 namespace ngraph
 {
     namespace onnx_import
     {
-        namespace default_opset = ngraph::opset3;
+        namespace default_opset = ngraph::opset4;
     }
 }
diff --git a/ngraph/src/ngraph/frontend/onnx_import/op/acosh.cpp b/ngraph/src/ngraph/frontend/onnx_import/op/acosh.cpp
deleted file mode 100644
index d69ebb7b8b1..00000000000
--- a/ngraph/src/ngraph/frontend/onnx_import/op/acosh.cpp
+++ /dev/null
@@ -1,60 +0,0 @@
-//*****************************************************************************
-// Copyright 2017-2020 Intel Corporation
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//*****************************************************************************
-
-#include <memory>
-
-#include "acosh.hpp"
-#include "default_opset.hpp"
-#include "ngraph/op/add.hpp"
-#include "ngraph/op/multiply.hpp"
-#include "ngraph/op/subtract.hpp"
-#include "ngraph/shape.hpp"
-
-namespace ngraph
-{
-    namespace onnx_import
-    {
-        namespace op
-        {
-            namespace set_1
-            {
-                NodeVector acosh(const Node& node)
-                {
-                    std::shared_ptr<ngraph::Node> data{node.get_ng_inputs().at(0)};
-
-                    // Define inverse hyperbolic cosine in terms of natural logarithm:
-                    //
-                    // arccosh(x) = ln(x + sqrt(x^2 - 1))
-                    //
-
-                    const auto one =
-                        default_opset::Constant::create(data->get_element_type(), {}, {1.f});
-
-                    const auto x_square = std::make_shared<default_opset::Multiply>(data, data);
-                    const auto sqrt_args = std::make_shared<default_opset::Subtract>(x_square, one);
-                    const auto sqrt_node = std::make_shared<default_opset::Sqrt>(sqrt_args);
-                    const auto log_args = std::make_shared<default_opset::Add>(data, sqrt_node);
-
-                    return {std::make_shared<default_opset::Log>(log_args)};
-                }
-
-            } // namespace set_1
-
-        } // namespace op
-
-    } // namespace onnx_import
-
-} // namespace ngraph
diff --git a/ngraph/src/ngraph/frontend/onnx_import/op/acosh.hpp b/ngraph/src/ngraph/frontend/onnx_import/op/acosh.hpp
index 4a20e8e285d..77f1e1a87e5 100644
--- a/ngraph/src/ngraph/frontend/onnx_import/op/acosh.hpp
+++ b/ngraph/src/ngraph/frontend/onnx_import/op/acosh.hpp
@@ -17,6 +17,7 @@
 #pragma once
 
 #include "core/node.hpp"
+#include "default_opset.hpp"
 #include "ngraph/node.hpp"
 
 namespace ngraph
@@ -27,7 +28,10 @@ namespace ngraph
         {
             namespace set_1
             {
-                NodeVector acosh(const Node& node);
+                inline NodeVector acosh(const Node& node)
+                {
+                    return {std::make_shared<default_opset::Acosh>(node.get_ng_inputs().at(0))};
+                }
             } // namespace set_1
 
         } // namespace op
diff --git a/ngraph/src/ngraph/opsets/opset4_tbl.hpp b/ngraph/src/ngraph/opsets/opset4_tbl.hpp
index 83a34083dcb..1bacb26dbac 100644
--- a/ngraph/src/ngraph/opsets/opset4_tbl.hpp
+++ b/ngraph/src/ngraph/opsets/opset4_tbl.hpp
@@ -153,3 +153,4 @@ NGRAPH_OP(TopK, ngraph::op::v3)
 
 // New operations added in opset4
 NGRAPH_OP(NonMaxSuppression, ngraph::op::v4)
+NGRAPH_OP(Acosh, ngraph::op::v3)
diff --git a/ngraph/test/util/engine/ie_engines.cpp b/ngraph/test/util/engine/ie_engines.cpp
index 683bbc6f18b..21c3fd60fe0 100644
--- a/ngraph/test/util/engine/ie_engines.cpp
+++ b/ngraph/test/util/engine/ie_engines.cpp
@@ -203,6 +203,8 @@ std::set<NodeTypeInfo> test::IE_Engine::get_ie_ops() const
     ie_ops.insert(opset2.begin(), opset2.end());
     const auto& opset3 = get_opset3().get_type_info_set();
     ie_ops.insert(opset3.begin(), opset3.end());
+    const auto& opset4 = get_opset4().get_type_info_set();
+    ie_ops.insert(opset4.begin(), opset4.end());
     return ie_ops;
 }