diff --git a/.changeset/plenty-oranges-count.md b/.changeset/plenty-oranges-count.md
new file mode 100644
index 000000000000..3031d3cc6f43
--- /dev/null
+++ b/.changeset/plenty-oranges-count.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: do not override default cookie decoder to allow users to override the `cookie` library version
diff --git a/packages/kit/src/runtime/server/cookie.js b/packages/kit/src/runtime/server/cookie.js
index ddefa847a432..f4442872fbeb 100644
--- a/packages/kit/src/runtime/server/cookie.js
+++ b/packages/kit/src/runtime/server/cookie.js
@@ -67,8 +67,7 @@ export function get_cookies(request, url, trailing_slash) {
 				return c.value;
 			}
 
-			const decoder = opts?.decode || decodeURIComponent;
-			const req_cookies = parse(header, { decode: decoder });
+			const req_cookies = parse(header, { decode: opts?.decode });
 			const cookie = req_cookies[name]; // the decoded string or undefined
 
 			// in development, if the cookie was set during this session with `cookies.set`,
@@ -95,8 +94,7 @@ export function get_cookies(request, url, trailing_slash) {
 		 * @param {import('cookie').CookieParseOptions} opts
 		 */
 		getAll(opts) {
-			const decoder = opts?.decode || decodeURIComponent;
-			const cookies = parse(header, { decode: decoder });
+			const cookies = parse(header, { decode: opts?.decode });
 
 			for (const c of Object.values(new_cookies)) {
 				if (