diff --git a/types/hotwired__turbo/hotwired__turbo-tests.ts b/types/hotwired__turbo/hotwired__turbo-tests.ts
index ec30cf42b88978..c8b709958358ba 100644
--- a/types/hotwired__turbo/hotwired__turbo-tests.ts
+++ b/types/hotwired__turbo/hotwired__turbo-tests.ts
@@ -94,6 +94,14 @@ StreamActions.log = function() {
     console.log(this.getAttribute("message"));
 };
 
+document.addEventListener("turbo:before-fetch-request", function(event) {
+    // $ExpectType FetchRequestHeaders
+    const headers = event.detail.fetchOptions.headers;
+    headers["Turbo-Referrer"] = window.location.href;
+    // $ExpectType string | undefined
+    headers.Accept;
+});
+
 document.addEventListener("turbo:before-fetch-response", function(e) {
     let { fetchResponse } = e.detail;
     fetchResponse.header("foo");
@@ -106,6 +114,13 @@ document.addEventListener("turbo:before-render", function(e) {
         // $ExpectType HTMLBodyElement
         newElement;
     };
+    // $ExpectType (value?: unknown) => void
+    e.detail.resume;
+});
+
+document.addEventListener("turbo:before-frame-render", function(e) {
+    // $ExpectType (value?: unknown) => void
+    e.detail.resume;
 });
 
 document.addEventListener("turbo:frame-missing", function(event) {
diff --git a/types/hotwired__turbo/index.d.ts b/types/hotwired__turbo/index.d.ts
index 8bacdec62669a3..33c0b4c65bab7a 100644
--- a/types/hotwired__turbo/index.d.ts
+++ b/types/hotwired__turbo/index.d.ts
@@ -78,11 +78,15 @@ export class StreamMessage {
     constructor(fragment: DocumentFragment);
 }
 
+export interface FetchRequestHeaders {
+    [header: string]: string | undefined;
+}
+
 export class FetchRequest {
     body: FormData | URLSearchParams;
     enctype: "application/x-www-form-urlencoded" | "multipart/form-data" | "text/plain";
     fetchOptions: RequestInit;
-    headers: Headers | { [k: string]: any };
+    headers: FetchRequestHeaders;
     method: "get" | "post" | "put" | "patch" | "delete";
     params: URLSearchParams;
     target: HTMLFormElement | HTMLAnchorElement | FrameElement | null;
@@ -407,7 +411,7 @@ export type TurboBeforeRenderEvent = CustomEvent<{
     newBody: HTMLBodyElement;
     renderMethod: "replace" | "morph";
     isPreview: boolean;
-    resume: (value?: any) => void;
+    resume: (value?: unknown) => void;
     render: (currentBody: HTMLBodyElement, newBody: HTMLBodyElement) => void;
 }>;
 export type TurboBeforeVisitEvent = CustomEvent<{ url: string }>;
@@ -418,7 +422,7 @@ export type TurboClickEvent = CustomEvent<{
 export type TurboFrameLoadEvent = CustomEvent;
 export type TurboBeforeFrameRenderEvent = CustomEvent<{
     newFrame: FrameElement;
-    resume: (value?: any) => void;
+    resume: (value?: unknown) => void;
     render: (currentFrame: FrameElement, newFrame: FrameElement) => void;
 }>;
 export type TurboFrameRenderEvent = CustomEvent<{
@@ -489,9 +493,9 @@ export type TurboFrameMissingEvent = CustomEvent<{
 }>;
 
 export type TurboBeforeFetchRequestEvent = CustomEvent<{
-    fetchOptions: RequestInit;
+    fetchOptions: Omit<RequestInit, "headers"> & { headers: FetchRequestHeaders };
     url: URL;
-    resume: (value: any) => void;
+    resume: (value?: unknown) => void;
 }>;
 
 export type TurboBeforeFetchResponseEvent = CustomEvent<{