diff --git a/modules/swagger-core/src/main/java/io/swagger/v3/core/filter/SpecFilter.java b/modules/swagger-core/src/main/java/io/swagger/v3/core/filter/SpecFilter.java
index aef8b69384..e0f15c8679 100755
--- a/modules/swagger-core/src/main/java/io/swagger/v3/core/filter/SpecFilter.java
+++ b/modules/swagger-core/src/main/java/io/swagger/v3/core/filter/SpecFilter.java
@@ -350,38 +350,98 @@ private void addPathItemSchemaRef(PathItem pathItem, Set<String> referencedDefin
         Map<PathItem.HttpMethod, Operation> ops = pathItem.readOperationsMap();
         for (Operation op : ops.values()) {
             if (op.getRequestBody() != null) {
-                addContentSchemaRef(op.getRequestBody().getContent(), referencedDefinitions);
+                addRequestBodySchemaRef(op.getRequestBody(), referencedDefinitions);
             }
             if (op.getResponses() != null) {
                 for (String keyResponses : op.getResponses().keySet()) {
                     ApiResponse response = op.getResponses().get(keyResponses);
-                    if (response.getHeaders() != null) {
-                        for (String keyHeaders : response.getHeaders().keySet()) {
-                            Header header = response.getHeaders().get(keyHeaders);
-                            addSchemaRef(header.getSchema(), referencedDefinitions);
-                            addContentSchemaRef(header.getContent(), referencedDefinitions);
-                        }
-                    }
-                    addContentSchemaRef(response.getContent(), referencedDefinitions);
+                    addApiResponseSchemaRef(response, referencedDefinitions);
                 }
             }
             if (op.getParameters() != null) {
                 for (Parameter parameter : op.getParameters()) {
-                    addSchemaRef(parameter.getSchema(), referencedDefinitions);
-                    addContentSchemaRef(parameter.getContent(), referencedDefinitions);
+                    addParameterSchemaRef(parameter, referencedDefinitions);
                 }
             }
             if (op.getCallbacks() != null) {
                 for (String keyCallback : op.getCallbacks().keySet()) {
                     Callback callback = op.getCallbacks().get(keyCallback);
-                    for (PathItem callbackPathItem : callback.values()) {
-                        addPathItemSchemaRef(callbackPathItem, referencedDefinitions);
-                    }
+                    addCallbackSchemaRef(callback, referencedDefinitions);
                 }
             }
         }
     }
 
+    private void addApiResponseSchemaRef(ApiResponse response, Set<String> referencedDefinitions) {
+        if (response.getHeaders() != null) {
+            for (String keyHeaders : response.getHeaders().keySet()) {
+                Header header = response.getHeaders().get(keyHeaders);
+                addHeaderSchemaRef(header, referencedDefinitions);
+            }
+        }
+        addContentSchemaRef(response.getContent(), referencedDefinitions);
+    }
+
+    private void addRequestBodySchemaRef(RequestBody requestBody, Set<String> referencedDefinitions) {
+            addContentSchemaRef(requestBody.getContent(), referencedDefinitions);
+    }
+
+    private void addParameterSchemaRef(Parameter parameter, Set<String> referencedDefinitions) {
+        addSchemaRef(parameter.getSchema(), referencedDefinitions);
+        addContentSchemaRef(parameter.getContent(), referencedDefinitions);
+    }
+
+    private void addHeaderSchemaRef(Header header, Set<String> referencedDefinitions) {
+        addSchemaRef(header.getSchema(), referencedDefinitions);
+        addContentSchemaRef(header.getContent(), referencedDefinitions);
+    }
+
+    private void addCallbackSchemaRef(Callback callback, Set<String> referencedDefinitions){
+        for (PathItem callbackPathItem : callback.values()) {
+            addPathItemSchemaRef(callbackPathItem, referencedDefinitions);
+        }
+    }
+
+    private void addComponentsSchemaRef(Components components, Set<String> referencedDefinitions){
+
+        if (components.getResponses() != null){
+            for (String resourcePath : components.getResponses().keySet()) {
+                ApiResponse apiResponse = components.getResponses().get(resourcePath);
+                addApiResponseSchemaRef(apiResponse, referencedDefinitions);
+            }
+        }
+        if (components.getRequestBodies() != null){
+            for (String requestBody : components.getRequestBodies().keySet()) {
+                RequestBody requestBody1 = components.getRequestBodies().get(requestBody);
+                addRequestBodySchemaRef(requestBody1, referencedDefinitions);
+            }
+        }
+        if (components.getParameters() != null){
+            for (String parameter : components.getParameters().keySet()) {
+                Parameter resourceParam = components.getParameters().get(parameter);
+                addParameterSchemaRef(resourceParam, referencedDefinitions);
+            }
+        }
+        if (components.getHeaders() != null){
+            for (String header : components.getHeaders().keySet()) {
+                Header resourceHeader = components.getHeaders().get(header);
+                addHeaderSchemaRef(resourceHeader, referencedDefinitions);
+            }
+        }
+        if (components.getCallbacks() != null){
+            for (String callback : components.getCallbacks().keySet()){
+                Callback resourceCallback = components.getCallbacks().get(callback);
+                addCallbackSchemaRef(resourceCallback, referencedDefinitions);
+            }
+        }
+        if (components.getPathItems() != null){
+            for (String resourcePath : components.getPathItems().keySet()){
+                PathItem pathItem = components.getPathItems().get(resourcePath);
+                addPathItemSchemaRef(pathItem, referencedDefinitions);
+            }
+        }
+    }
+
     protected OpenAPI removeBrokenReferenceDefinitions(OpenAPI openApi) {
 
         if (openApi == null || openApi.getComponents() == null || openApi.getComponents().getSchemas() == null) {
@@ -395,6 +455,16 @@ protected OpenAPI removeBrokenReferenceDefinitions(OpenAPI openApi) {
                 addPathItemSchemaRef(pathItem, referencedDefinitions);
             }
         }
+        if (openApi.getWebhooks() != null){
+            for (String resourcePath : openApi.getWebhooks().keySet()) {
+                PathItem pathItem = openApi.getWebhooks().get(resourcePath);
+                addPathItemSchemaRef(pathItem, referencedDefinitions);
+            }
+        }
+        if (openApi.getComponents() != null){
+            Components components = openApi.getComponents();
+            addComponentsSchemaRef(components, referencedDefinitions);
+        }
 
         referencedDefinitions.addAll(resolveAllNestedRefs(referencedDefinitions, referencedDefinitions, openApi));
         openApi.getComponents()
diff --git a/modules/swagger-core/src/test/java/io/swagger/v3/core/filter/SpecFilterTest.java b/modules/swagger-core/src/test/java/io/swagger/v3/core/filter/SpecFilterTest.java
index f04c9b56e7..355d4722e2 100644
--- a/modules/swagger-core/src/test/java/io/swagger/v3/core/filter/SpecFilterTest.java
+++ b/modules/swagger-core/src/test/java/io/swagger/v3/core/filter/SpecFilterTest.java
@@ -16,6 +16,8 @@
 import io.swagger.v3.core.matchers.SerializationMatchers;
 import io.swagger.v3.core.util.Json;
 import io.swagger.v3.core.util.Json31;
+import io.swagger.v3.core.util.Yaml;
+import io.swagger.v3.core.util.Yaml31;
 import io.swagger.v3.core.util.ResourceUtils;
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.OpenAPI;
@@ -46,6 +48,8 @@ public class SpecFilterTest {
     private static final String RESOURCE_RECURSIVE_MODELS = "specFiles/recursivemodels.json";
     private static final String RESOURCE_PATH = "specFiles/petstore-3.0-v2.json";
     private static final String RESOURCE_PATH_3303 = "specFiles/petstore-3.0-v2-ticket-3303.json";
+    private static final String RESOURCE_WITH_REF_DEFINITION_4737 = "specFiles/3.1.0/issue-4737-3.1.yaml";
+    private static final String RESOURCE_WITH_REFERRED_DEFINITIONS= "specFiles/3.1.0/specWithReferredSchemas-3.1.yaml";
     private static final String RESOURCE_PATH_LIST = "specFiles/3.1.0/list-3.1.json";
     private static final String RESOURCE_PATH_COMPOSED_SCHEMA = "specFiles/3.1.0/composed-schema-3.1.json";
     private static final String RESOURCE_REFERRED_SCHEMAS = "specFiles/petstore-3.0-referred-schemas.json";
@@ -450,6 +454,30 @@ public void filterWithNullDefinitions() throws IOException {
         assertNotNull(filtered);
     }
 
+    @Test(description = "RemoveUnreferencedDefinitionsFilter should not remove schema definition if ref used in Webhook")
+    public void testTicket4737() throws IOException {
+        final OpenAPI openAPI = getOpenAPIYaml31(RESOURCE_WITH_REF_DEFINITION_4737);
+        final RemoveUnreferencedDefinitionsFilter remover = new RemoveUnreferencedDefinitionsFilter();
+        final OpenAPI filtered = new SpecFilter().filter(openAPI, remover, null, null, null);
+        assertNotNull(filtered.getComponents().getSchemas().get("RequestDto"));
+    }
+
+    @Test
+    public void shouldNotRemoveUsedDefinitions() throws IOException {
+        final OpenAPI openAPI = getOpenAPIYaml31(RESOURCE_WITH_REFERRED_DEFINITIONS);
+        final RemoveUnreferencedDefinitionsFilter remover = new RemoveUnreferencedDefinitionsFilter();
+        final OpenAPI filtered = new SpecFilter().filter(openAPI, remover, null, null, null);
+        assertNotNull(filtered.getComponents().getSchemas().get("ResponseDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("WebhookResponseDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("WebhookOperationDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("RequestBodyDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("ParameterDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("HeaderDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("CallbackDefinition"));
+        assertNotNull(filtered.getComponents().getSchemas().get("PathItemDefinition"));
+        assertNull(filtered.getComponents().getSchemas().get("UnusedDefinition"));
+    }
+
     private Set getTagNames(OpenAPI openAPI) {
         Set<String> result = new HashSet<>();
         if (openAPI.getTags() != null) {
@@ -469,4 +497,14 @@ private OpenAPI getOpenAPI31(String path) throws IOException {
         final String json = ResourceUtils.loadClassResource(getClass(), path);
         return Json31.mapper().readValue(json, OpenAPI.class);
     }
+
+    private OpenAPI getOpenAPIYaml(String path) throws IOException {
+        final String yaml = ResourceUtils.loadClassResource(getClass(), path);
+        return Yaml.mapper().readValue(yaml, OpenAPI.class);
+    }
+
+    private OpenAPI getOpenAPIYaml31(String path) throws IOException {
+        final String yaml = ResourceUtils.loadClassResource(getClass(), path);
+        return Yaml31.mapper().readValue(yaml, OpenAPI.class);
+    }
 }
diff --git a/modules/swagger-core/src/test/resources/specFiles/3.1.0/issue-4737-3.1.yaml b/modules/swagger-core/src/test/resources/specFiles/3.1.0/issue-4737-3.1.yaml
new file mode 100644
index 0000000000..1e1615a4f2
--- /dev/null
+++ b/modules/swagger-core/src/test/resources/specFiles/3.1.0/issue-4737-3.1.yaml
@@ -0,0 +1,29 @@
+openapi: 3.1.0
+info:
+  title: OpenAPI definition
+  version: v0
+servers:
+  - url: http://localhost
+    description: Generated server url
+paths: {}
+components:
+  schemas:
+    RequestDto:
+      properties:
+        personalNumber:
+          type: string
+webhooks:
+  newPet:
+    post:
+      requestBody:
+        description: Information about a new pet in the system
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/RequestDto'
+              description: Webhook Pet
+      responses:
+        '200':
+          description: >-
+            Return a 200 status to indicate that the data was received
+            successfully
\ No newline at end of file
diff --git a/modules/swagger-core/src/test/resources/specFiles/3.1.0/specWithReferredSchemas-3.1.yaml b/modules/swagger-core/src/test/resources/specFiles/3.1.0/specWithReferredSchemas-3.1.yaml
new file mode 100644
index 0000000000..bfc9e05cf4
--- /dev/null
+++ b/modules/swagger-core/src/test/resources/specFiles/3.1.0/specWithReferredSchemas-3.1.yaml
@@ -0,0 +1,124 @@
+openapi: 3.1.0
+info:
+  title: OpenAPI definition
+  version: v0
+servers:
+  - url: http://localhost
+    description: Generated server url
+paths:
+  /users:
+    get:
+      summary: Get list of all users
+      operationId: usersList
+      responses:
+        200:
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: string
+                maxLength: 100
+                minLength: 1
+components:
+  schemas:
+    ResponseDefinition:
+      properties:
+        personalNumber:
+          type: string
+    WebhookResponseDefinition:
+      properties:
+        personalNumber:
+          type: integer
+    WebhookOperationDefinition:
+      properties:
+        personalNumber:
+          type: number
+    RequestBodyDefinition:
+      properties:
+        personalNumber:
+          type: string
+    ParameterDefinition:
+      properties:
+        parameterName:
+          type: string
+    HeaderDefinition:
+      type: string
+      description: header ref
+    CallbackDefinition:
+      description: callback ref
+      type: string
+    PathItemDefinition:
+      description: pathItem ref
+      type: string
+    UnusedDefinition:
+      description: unused definition
+      type: string
+      minLength: 1
+      maxLength: 100
+  responses:
+    OK:
+      description: OK
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/ResponseDefinition"
+  requestBodies:
+    requestBody1:
+      description: request body
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/RequestBodyDefinition"
+  parameters:
+    parameter1:
+      description: request body
+      name: parameter
+      in: query
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/ParameterDefinition"
+  headers:
+    header1:
+      content:
+        application/json:
+          schema:
+            $ref: "#/components/schemas/HeaderDefinition"
+  callbacks:
+      myEvent: # Event name
+        "{$request.body#/callbackUrl}":
+          post:
+            requestBody:
+              required: true
+              content:
+                application/json:
+                  schema:
+                    $ref: "#/components/schemas/CallbackDefinition"
+  pathItems:
+    pathItem1:
+      get:
+        summary: Get list of all users
+        operationId: usersList
+        responses:
+          200:
+            description: OK
+            content:
+              application/json:
+                schema:
+                  $ref: "#/components/schemas/PathItemDefinition"
+webhooks:
+  newPet:
+    post:
+      requestBody:
+        description: Information about a new pet in the system
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/WebhookOperationDefinition'
+              description: Webhook Pet
+      responses:
+        '200':
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/WebhookResponseDefinition'