diff --git a/.changeset/orange-suits-nail.md b/.changeset/orange-suits-nail.md
new file mode 100644
index 00000000000..9fe5caad30b
--- /dev/null
+++ b/.changeset/orange-suits-nail.md
@@ -0,0 +1,7 @@
+---
+"@remix-run/architect": patch
+"@remix-run/express": patch
+---
+
+- Switch to `headers.entries()` instead of non-spec-compliant `headers.raw()` in `sendRemixResponse`
+- Update to `@remix-run/web-fetch@4.3.7`
diff --git a/packages/remix-architect/__tests__/server-test.ts b/packages/remix-architect/__tests__/server-test.ts
index 5c27d2748ba..f32c07aac49 100644
--- a/packages/remix-architect/__tests__/server-test.ts
+++ b/packages/remix-architect/__tests__/server-test.ts
@@ -201,7 +201,9 @@ describe("architect createRemixHeaders", () => {
   describe("creates fetch headers from architect headers", () => {
     it("handles empty headers", () => {
       let headers = createRemixHeaders({});
-      expect(headers.raw()).toMatchInlineSnapshot(`Object {}`);
+      expect(Object.fromEntries(headers.entries())).toMatchInlineSnapshot(
+        `Object {}`
+      );
     });
 
     it("handles simple headers", () => {
diff --git a/packages/remix-architect/server.ts b/packages/remix-architect/server.ts
index f90e89c336a..81340c9cc9b 100644
--- a/packages/remix-architect/server.ts
+++ b/packages/remix-architect/server.ts
@@ -106,11 +106,9 @@ export async function sendRemixResponse(
   let cookies: string[] = [];
 
   // Arc/AWS API Gateway will send back set-cookies outside of response headers.
-  for (let [key, values] of Object.entries(nodeResponse.headers.raw())) {
+  for (let [key, value] of nodeResponse.headers.entries()) {
     if (key.toLowerCase() === "set-cookie") {
-      for (let value of values) {
-        cookies.push(value);
-      }
+      cookies.push(value);
     }
   }
 
diff --git a/packages/remix-express/__tests__/server-test.ts b/packages/remix-express/__tests__/server-test.ts
index adc45c4adc6..75f9e835671 100644
--- a/packages/remix-express/__tests__/server-test.ts
+++ b/packages/remix-express/__tests__/server-test.ts
@@ -158,7 +158,9 @@ describe("express createRemixHeaders", () => {
   describe("creates fetch headers from express headers", () => {
     it("handles empty headers", () => {
       let headers = createRemixHeaders({});
-      expect(headers.raw()).toMatchInlineSnapshot(`Object {}`);
+      expect(Object.fromEntries(headers.entries())).toMatchInlineSnapshot(
+        `Object {}`
+      );
     });
 
     it("handles simple headers", () => {
diff --git a/packages/remix-express/server.ts b/packages/remix-express/server.ts
index a775a006fe9..a3f14ce0d54 100644
--- a/packages/remix-express/server.ts
+++ b/packages/remix-express/server.ts
@@ -118,10 +118,8 @@ export async function sendRemixResponse(
   res.statusMessage = nodeResponse.statusText;
   res.status(nodeResponse.status);
 
-  for (let [key, values] of Object.entries(nodeResponse.headers.raw())) {
-    for (let value of values) {
-      res.append(key, value);
-    }
+  for (let [key, value] of nodeResponse.headers.entries()) {
+    res.append(key, value);
   }
 
   if (nodeResponse.body) {
diff --git a/packages/remix-node/package.json b/packages/remix-node/package.json
index 4ccb959c1e1..def114e1083 100644
--- a/packages/remix-node/package.json
+++ b/packages/remix-node/package.json
@@ -18,7 +18,7 @@
   ],
   "dependencies": {
     "@remix-run/server-runtime": "1.19.3",
-    "@remix-run/web-fetch": "^4.3.6",
+    "@remix-run/web-fetch": "^4.3.7",
     "@remix-run/web-file": "^3.0.3",
     "@remix-run/web-stream": "^1.0.4",
     "@web3-storage/multipart-parser": "^1.0.0",
diff --git a/yarn.lock b/yarn.lock
index eaee585b4be..12fcff44a04 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2138,10 +2138,10 @@
     "@remix-run/web-stream" "^1.0.4"
     web-encoding "1.1.5"
 
-"@remix-run/web-fetch@^4.3.6":
-  version "4.3.6"
-  resolved "https://registry.npmjs.org/@remix-run/web-fetch/-/web-fetch-4.3.6.tgz#7853f6496cfa2b9fb11298891b446062eab25738"
-  integrity sha512-ifadyJS+/7W6LhKyA8tIR9fBIPwLCFVpl1YCYg5i0ikykiXxE3IWtPVB1G51AJFghc1YgR7rq8BRJLsJeUbE5Q==
+"@remix-run/web-fetch@^4.3.7":
+  version "4.3.7"
+  resolved "https://registry.npmjs.org/@remix-run/web-fetch/-/web-fetch-4.3.7.tgz#b391cd73bb5ecd8f4603e7151054712d9d5f0328"
+  integrity sha512-Ha6TuLiVHBbLuSNRgEQTz01pgG+bZVNogkKZt1cVi0asOuKISl0X2UgPLv+dWBqfcFvTi8CQvYUNuk5c89TcZw==
   dependencies:
     "@remix-run/web-blob" "^3.0.5"
     "@remix-run/web-form-data" "^3.0.5"