diff --git a/packages/core/src/model/artifacts/HTTPRequestResponse.ts b/packages/core/src/model/artifacts/HTTPRequestResponse.ts
index 987ec0f856a..58d2e2cc191 100644
--- a/packages/core/src/model/artifacts/HTTPRequestResponse.ts
+++ b/packages/core/src/model/artifacts/HTTPRequestResponse.ts
@@ -12,13 +12,15 @@ export interface RequestAndResponse extends JSONObject {
     request: {
         url: string;
         method: string;
-        headers: { [header: string]: string };
+        headers: Record<string, string | number | boolean>;
         data?: any;
     };
     response: {
         status: number;
         data?: any;
-        headers?: { [header: string]: string };
+        headers?: Record<string, string> & {
+            'set-cookie'?: string[]
+        };
     };
 }
 
diff --git a/packages/rest/src/screenplay/abilities/CallAnApi.ts b/packages/rest/src/screenplay/abilities/CallAnApi.ts
index 76d7e21d69d..82fc94c4004 100644
--- a/packages/rest/src/screenplay/abilities/CallAnApi.ts
+++ b/packages/rest/src/screenplay/abilities/CallAnApi.ts
@@ -1,5 +1,5 @@
 import { Ability, ConfigurationError, LogicError, TestCompromisedError, UsesAbilities } from '@serenity-js/core';
-import axios, { AxiosError, AxiosInstance, AxiosPromise, AxiosRequestConfig, AxiosResponse } from 'axios';
+import axios, { AxiosDefaults, AxiosError, AxiosInstance, AxiosPromise, AxiosRequestConfig, AxiosResponse } from 'axios';
 const mergeConfig = require('axios/lib/core/mergeConfig');      // eslint-disable-line @typescript-eslint/no-var-requires
 const buildFullPath = require('axios/lib/core/buildFullPath');  // eslint-disable-line @typescript-eslint/no-var-requires
 
@@ -126,7 +126,7 @@ export class CallAnApi implements Ability {
      *
      * @see {@link AxiosRequestConfig}
      */
-    modifyConfig(fn: (original: AxiosRequestConfig) => any): void {
+    modifyConfig(fn: (original: AxiosDefaults<any>) => any): void {
         fn(this.axiosInstance.defaults);
     }
 
diff --git a/packages/serenity-bdd/src/stage/crew/serenity-bdd-reporter/processors/transformations/activityRelatedArtifact.ts b/packages/serenity-bdd/src/stage/crew/serenity-bdd-reporter/processors/transformations/activityRelatedArtifact.ts
index 4cd76292512..381b263f7be 100644
--- a/packages/serenity-bdd/src/stage/crew/serenity-bdd-reporter/processors/transformations/activityRelatedArtifact.ts
+++ b/packages/serenity-bdd/src/stage/crew/serenity-bdd-reporter/processors/transformations/activityRelatedArtifact.ts
@@ -60,7 +60,7 @@ export function activityRelatedArtifact<Context extends SerenityBDDReportContext
             .else(_ => report)
 }
 
-function mapToString(dictionary: {[key: string]: string}) {
+function mapToString(dictionary: Record<string, string | number | boolean>) {
     return Object.keys(dictionary).map(key => `${key}: ${dictionary[key]}`).join('\n');
 }
 
@@ -88,9 +88,9 @@ function httpRequestResponse<Context extends SerenityBDDReportContext>(activityI
                 method:          requestResponse.request.method.toUpperCase(),
                 path:            requestResponse.request.url,
                 content:         bodyToString(requestResponse.request.data),
-                contentType:     requestResponse.request.headers['Content-Type'] || '', // todo: add a case insensitive proxy around this RFC 2616: 4.2
-                requestHeaders:  mapToString(requestResponse.request.headers)  || '',
-                requestCookies:  requestResponse.request.headers.Cookie || '', // todo: add a case insensitive proxy around this RFC 2616: 4.2
+                contentType:     String(requestResponse.request.headers['Content-Type'] || ''), // todo: add a case insensitive proxy around this RFC 2616: 4.2
+                requestHeaders:  mapToString(requestResponse.request.headers || {})  || '',
+                requestCookies:  String(requestResponse.request.headers.Cookie || ''), // todo: add a case insensitive proxy around this RFC 2616: 4.2
                 statusCode:      requestResponse.response.status,
                 responseHeaders: mapToString(requestResponse.response.headers) || '',
                 responseCookies: requestResponse.response.headers.Cookie || '', // todo: add a case insensitive proxy around this RFC 2616: 4.2