diff --git a/packages/oas/src/operation/index.ts b/packages/oas/src/operation/index.ts
index ffd5af22..0a7af7b3 100644
--- a/packages/oas/src/operation/index.ts
+++ b/packages/oas/src/operation/index.ts
@@ -3,6 +3,7 @@ import type { getParametersAsJSONSchemaOptions } from './lib/get-parameters-as-j
 import type { RequestBodyExamples } from './lib/get-requestbody-examples.js';
 import type { ResponseExamples } from './lib/get-response-examples.js';
 import type { Extensions } from '../extensions.js';
+import type { SecurityType } from '../types.js';
 import type { OpenAPIV3, OpenAPIV3_1 } from 'openapi-types';
 
 import findSchemaDefinition from '../lib/find-schema-definition.js';
@@ -18,8 +19,6 @@ import { getRequestBodyExamples } from './lib/get-requestbody-examples.js';
 import { getResponseAsJSONSchema } from './lib/get-response-as-json-schema.js';
 import { getResponseExamples } from './lib/get-response-examples.js';
 
-type SecurityType = 'apiKey' | 'Basic' | 'Bearer' | 'Cookie' | 'Header' | 'http' | 'OAuth2' | 'Query';
-
 export class Operation {
   /**
    * Schema of the operation from the API Definition.
@@ -224,6 +223,7 @@ export class Operation {
           security: {
             ...security,
             _key: key,
+            _requirements: requirement[key],
           },
         };
       });
@@ -252,8 +252,12 @@ export class Operation {
           if (!prev[security.type]) prev[security.type] = [];
 
           // Only add schemes we haven't seen yet.
-          const exists = prev[security.type].findIndex(sec => sec._key === security.security._key);
-          if (exists < 0) {
+          const exists = prev[security.type].some(sec => sec._key === security.security._key);
+          if (!exists) {
+            // Since an operation can require the same security scheme several times (each with different scope requirements),
+            // including the `_requirements` in this object would be misleading since we dedupe the security schemes.
+            // eslint-disable-next-line no-underscore-dangle
+            if (security.security?._requirements) delete security.security._requirements;
             prev[security.type].push(security.security);
           }
         });
diff --git a/packages/oas/src/types.ts b/packages/oas/src/types.ts
index 8975f795..85520113 100644
--- a/packages/oas/src/types.ts
+++ b/packages/oas/src/types.ts
@@ -47,6 +47,11 @@ export interface User {
   }[];
 }
 
+/**
+ * The type of security scheme. Used by `operation.getSecurityWithTypes()` and `operation.prepareSecurity()`.
+ */
+export type SecurityType = 'apiKey' | 'Basic' | 'Bearer' | 'Cookie' | 'Header' | 'http' | 'OAuth2' | 'Query';
+
 export type HttpMethods =
   | OpenAPIV3_1.HttpMethods
   | OpenAPIV3.HttpMethods
@@ -232,8 +237,17 @@ export type SecuritySchemeObject = OpenAPIV3_1.SecuritySchemeObject | OpenAPIV3.
 export type SecuritySchemesObject = Record<string, SecuritySchemeObject>;
 
 export type KeyedSecuritySchemeObject = SecuritySchemeObject & {
+  /**
+   * The key for the given security scheme object
+   */
   _key: string;
 
+  /**
+   * An array of required scopes for the given security scheme object.
+   * Used for `oauth2` security scheme types.
+   */
+  _requirements?: string[];
+
   // `x-default` is our custom extension for specifying auth defaults.
   // https://docs.readme.com/docs/openapi-extensions#authentication-defaults
   'x-default'?: number | string;
diff --git a/packages/oas/test/operation/index.test.ts b/packages/oas/test/operation/index.test.ts
index 71fe51d1..44eefef9 100644
--- a/packages/oas/test/operation/index.test.ts
+++ b/packages/oas/test/operation/index.test.ts
@@ -496,6 +496,7 @@ describe('#getSecurityWithTypes()', () => {
       {
         security: {
           _key: 'auth',
+          _requirements: [],
           scheme: 'basic',
           type: 'http',
         },
@@ -510,6 +511,7 @@ describe('#getSecurityWithTypes()', () => {
       {
         security: {
           _key: 'auth',
+          _requirements: [],
           scheme: 'basic',
           type: 'http',
         },
@@ -672,7 +674,7 @@ describe('#getSecurityWithTypes()', () => {
       [
         {
           type: 'Query',
-          security: { type: 'apiKey', name: 'api_key', in: 'query', _key: 'api_key' },
+          security: { type: 'apiKey', name: 'api_key', in: 'query', _key: 'api_key', _requirements: [] },
         },
       ],
     ]);