diff --git a/package-lock.json b/package-lock.json
index 7779309ef..503a12468 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4604,11 +4604,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/set-cookie-parser": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.6.0.tgz",
-      "integrity": "sha512-RVnVQxTXuerk653XfuliOxBP81Sf0+qfQE73LIYKcyMYHG94AuH0kgrQpRDuTZnSmjpysHmzxJXKNfa6PjFhyQ=="
-    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "dev": true,
@@ -5083,13 +5078,14 @@
       }
     },
     "node_modules/undici": {
-      "version": "5.13.0",
-      "license": "MIT",
+      "version": "5.22.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-5.22.1.tgz",
+      "integrity": "sha512-Ji2IJhFXZY0x/0tVBXeQwgPlLWw13GVzpsWPQ3rV50IFMMof2I55PZZxtm4P6iNq+L5znYN9nSTAq0ZyE6lSJw==",
       "dependencies": {
         "busboy": "^1.6.0"
       },
       "engines": {
-        "node": ">=12.18"
+        "node": ">=14.0"
       }
     },
     "node_modules/universalify": {
@@ -5454,10 +5450,9 @@
         "glob-to-regexp": "^0.4.1",
         "http-cache-semantics": "^4.1.0",
         "kleur": "^4.1.5",
-        "set-cookie-parser": "^2.6.0",
         "source-map-support": "0.5.21",
         "stoppable": "^1.1.0",
-        "undici": "^5.13.0",
+        "undici": "^5.22.1",
         "workerd": "1.20230724.0",
         "ws": "^8.11.0",
         "youch": "^3.2.2",
@@ -7705,10 +7700,9 @@
         "http-cache-semantics": "^4.1.0",
         "kleur": "^4.1.5",
         "semiver": "^1.1.0",
-        "set-cookie-parser": "^2.6.0",
         "source-map-support": "0.5.21",
         "stoppable": "^1.1.0",
-        "undici": "^5.13.0",
+        "undici": "^5.22.1",
         "workerd": "1.20230724.0",
         "ws": "^8.11.0",
         "youch": "^3.2.2",
@@ -8261,11 +8255,6 @@
         }
       }
     },
-    "set-cookie-parser": {
-      "version": "2.6.0",
-      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.6.0.tgz",
-      "integrity": "sha512-RVnVQxTXuerk653XfuliOxBP81Sf0+qfQE73LIYKcyMYHG94AuH0kgrQpRDuTZnSmjpysHmzxJXKNfa6PjFhyQ=="
-    },
     "shebang-command": {
       "version": "2.0.0",
       "dev": true,
@@ -8549,7 +8538,9 @@
       }
     },
     "undici": {
-      "version": "5.13.0",
+      "version": "5.22.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-5.22.1.tgz",
+      "integrity": "sha512-Ji2IJhFXZY0x/0tVBXeQwgPlLWw13GVzpsWPQ3rV50IFMMof2I55PZZxtm4P6iNq+L5znYN9nSTAq0ZyE6lSJw==",
       "requires": {
         "busboy": "^1.6.0"
       }
diff --git a/packages/miniflare/package.json b/packages/miniflare/package.json
index 0206a4c37..aca7fd111 100644
--- a/packages/miniflare/package.json
+++ b/packages/miniflare/package.json
@@ -35,10 +35,9 @@
     "glob-to-regexp": "^0.4.1",
     "http-cache-semantics": "^4.1.0",
     "kleur": "^4.1.5",
-    "set-cookie-parser": "^2.6.0",
     "source-map-support": "0.5.21",
     "stoppable": "^1.1.0",
-    "undici": "^5.13.0",
+    "undici": "^5.22.1",
     "workerd": "1.20230724.0",
     "ws": "^8.11.0",
     "youch": "^3.2.2",
diff --git a/packages/miniflare/src/index.ts b/packages/miniflare/src/index.ts
index 5dfe2df0b..1f7a4d930 100644
--- a/packages/miniflare/src/index.ts
+++ b/packages/miniflare/src/index.ts
@@ -14,7 +14,6 @@ import type {
   RequestInitCfProperties,
 } from "@cloudflare/workers-types/experimental";
 import exitHook from "exit-hook";
-import { splitCookiesString } from "set-cookie-parser";
 import stoppable from "stoppable";
 import { Client } from "undici";
 import { WebSocketServer } from "ws";
@@ -372,7 +371,7 @@ async function writeResponse(response: Response, res: http.ServerResponse) {
     const key = entry[0].toLowerCase();
     const value = entry[1];
     if (key === "set-cookie") {
-      headers[key] = splitCookiesString(value);
+      headers[key] = response.headers.getSetCookie();
     } else {
       headers[key] = value;
     }