diff --git a/internal/core/metadata/controller/http/uom.go b/internal/core/metadata/controller/http/uom.go
index 0e4ee98be5..c9efce89e8 100644
--- a/internal/core/metadata/controller/http/uom.go
+++ b/internal/core/metadata/controller/http/uom.go
@@ -1,5 +1,5 @@
 //
-// Copyright (C) 2022 IOTech Ltd
+// Copyright (C) 2022-2023 IOTech Ltd
 //
 // SPDX-License-Identifier: Apache-2.0
 
@@ -38,8 +38,8 @@ func (uc *UnitOfMeasureController) UnitsOfMeasure(w http.ResponseWriter, r *http
 	utils.WriteHttpHeader(w, ctx, http.StatusOK)
 
 	switch r.Header.Get(common.Accept) {
-	case common.ContentTypeTOML:
-		pkg.EncodeAndWriteTomlResponse(u, w, lc)
+	case common.ContentTypeYAML:
+		pkg.EncodeAndWriteYamlResponse(u, w, lc)
 	default:
 		pkg.EncodeAndWriteResponse(response, w, lc)
 	}
diff --git a/internal/core/metadata/controller/http/uom_test.go b/internal/core/metadata/controller/http/uom_test.go
index 4f68c4916e..5900508ba7 100644
--- a/internal/core/metadata/controller/http/uom_test.go
+++ b/internal/core/metadata/controller/http/uom_test.go
@@ -1,5 +1,5 @@
 //
-// Copyright (C) 2022 IOTech Ltd
+// Copyright (C) 2022-2023 IOTech Ltd
 //
 // SPDX-License-Identifier: Apache-2.0
 
@@ -7,6 +7,7 @@ package http
 
 import (
 	"encoding/json"
+	"gopkg.in/yaml.v3"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -14,7 +15,6 @@ import (
 	"github.com/edgexfoundry/go-mod-bootstrap/v3/di"
 	"github.com/edgexfoundry/go-mod-core-contracts/v3/common"
 	"github.com/edgexfoundry/go-mod-core-contracts/v3/dtos/responses"
-	"github.com/pelletier/go-toml"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -48,7 +48,7 @@ func TestUnitOfMeasureController_UnitsOfMeasure(t *testing.T) {
 		expectedResponse any
 	}{
 		{"valid - json response", common.ContentTypeJSON, responses.NewUnitsOfMeasureResponse("", "", http.StatusOK, testUoM)},
-		{"valid - toml response", common.ContentTypeTOML, testUoM},
+		{"valid - yaml response", common.ContentTypeYAML, testUoM},
 	}
 
 	for _, testCase := range tests {
@@ -76,10 +76,10 @@ func TestUnitOfMeasureController_UnitsOfMeasure(t *testing.T) {
 				assert.Empty(t, actualResponse.Message, "Message should be empty when it is successful")
 			} else {
 				actualResponse := uom.UnitsOfMeasureImpl{}
-				err = toml.Unmarshal(recorder.Body.Bytes(), &actualResponse)
+				err = yaml.Unmarshal(recorder.Body.Bytes(), &actualResponse)
 				require.NoError(t, err)
 
-				assert.Equal(t, actualResponse, testCase.expectedResponse, "TOML response not as expected")
+				assert.Equal(t, actualResponse, testCase.expectedResponse, "YAML response not as expected")
 			}
 		})
 	}
diff --git a/internal/pkg/encoding.go b/internal/pkg/encoding.go
index 356d26d77f..0f0a996853 100644
--- a/internal/pkg/encoding.go
+++ b/internal/pkg/encoding.go
@@ -1,5 +1,6 @@
 /*******************************************************************************
  * Copyright 2019 VMware Inc.
+ * Copyright (C) 2023 IOTech Ltd
  *
  * 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
@@ -15,11 +16,11 @@ package pkg
 
 import (
 	"encoding/json"
+	"gopkg.in/yaml.v3"
 	"net/http"
 
 	"github.com/edgexfoundry/go-mod-core-contracts/v3/clients/logger"
 	"github.com/edgexfoundry/go-mod-core-contracts/v3/common"
-	"github.com/pelletier/go-toml"
 )
 
 func EncodeAndWriteResponse(i interface{}, w http.ResponseWriter, LoggingClient logger.LoggingClient) {
@@ -35,10 +36,10 @@ func EncodeAndWriteResponse(i interface{}, w http.ResponseWriter, LoggingClient
 	}
 }
 
-func EncodeAndWriteTomlResponse(i interface{}, w http.ResponseWriter, lc logger.LoggingClient) {
-	w.Header().Set(common.ContentType, common.ContentTypeTOML)
+func EncodeAndWriteYamlResponse(i interface{}, w http.ResponseWriter, lc logger.LoggingClient) {
+	w.Header().Set(common.ContentType, common.ContentTypeYAML)
 
-	enc := toml.NewEncoder(w)
+	enc := yaml.NewEncoder(w)
 	err := enc.Encode(i)
 	// Problems encoding
 	if err != nil {
diff --git a/openapi/v3/core-metadata.yaml b/openapi/v3/core-metadata.yaml
index 0062faff13..bbb2c23f91 100644
--- a/openapi/v3/core-metadata.yaml
+++ b/openapi/v3/core-metadata.yaml
@@ -3808,7 +3808,7 @@ paths:
               examples:
                 UnitsOfMeasureResponse:
                   $ref: '#/components/examples/UnitsOfMeasureResponseExample'
-            application/toml:
+            application/yaml:
               schema:
                 $ref: '#/components/schemas/UnitsOfMeasure'
         '500':