diff --git a/pkgs/development/python-modules/marimo/default.nix b/pkgs/development/python-modules/marimo/default.nix
index 4a5463ee2faa..5bf6d0d03f74 100644
--- a/pkgs/development/python-modules/marimo/default.nix
+++ b/pkgs/development/python-modules/marimo/default.nix
@@ -1,7 +1,6 @@
 {
   lib,
   buildPythonPackage,
-  fetchpatch2,
   fetchPypi,
 
   # build-system
@@ -14,6 +13,7 @@
   jedi,
   loro,
   markdown,
+  msgspec,
   narwhals,
   packaging,
   psutil,
@@ -29,27 +29,17 @@
   # tests
   versionCheckHook,
 }:
-
 buildPythonPackage rec {
   pname = "marimo";
-  version = "0.19.4";
+  version = "0.20.4";
   pyproject = true;
 
   # The github archive does not include the static assets
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-7sO3ZcP9mNY+IBfFagJOd5ppI8tW52gueIdtT+SUCbc=";
+    hash = "sha256-f0bOg3lTcXUEZz4z5H+0KmGb9fnSAA0aOjsWY6R8VJg=";
   };
 
-  patches = [
-    # https://github.com/marimo-team/marimo/pull/6714
-    (fetchpatch2 {
-      name = "uv-build.patch";
-      url = "https://github.com/Prince213/marimo/commit/b1c690e82e8117c451a74fdf172eb51a4861853d.patch?full_index=1";
-      hash = "sha256-iFS5NSGjaGdECRk0LCRSA8XzRb1/sVSZCTRLy6taHNU=";
-    })
-  ];
-
   build-system = [ uv-build ];
 
   dependencies = [
@@ -59,6 +49,7 @@ buildPythonPackage rec {
     jedi
     loro
     markdown
+    msgspec
     narwhals
     packaging
     psutil