diff --git a/pkgs/by-name/un/unicode-paracode/package.nix b/pkgs/by-name/un/unicode-paracode/package.nix
index 2b3ac152a4ce..8a3d7028f74b 100644
--- a/pkgs/by-name/un/unicode-paracode/package.nix
+++ b/pkgs/by-name/un/unicode-paracode/package.nix
@@ -19,6 +19,14 @@ python3Packages.buildPythonApplication rec {
     sha256 = "sha256-FHAlZ5HID/FE9+YR7Dmc3Uh7E16QKORoD8g9jgTeQdY=";
   };
 
+  patches = [
+    # Fix 3.13+ mutable locals()
+    (fetchurl {
+      url = "https://github.com/garabik/unicode/commit/412952b9b4730263f5b560924b84f8934ea4ba21.patch";
+      hash = "sha256-Rfm6Jc7V5n7ggQzA/yeDrYedGMWqRkeUX6FRCUkBWcI=";
+    })
+  ];
+
   ucdtxt = fetchurl {
     url = "https://www.unicode.org/Public/16.0.0/ucd/UnicodeData.txt";
     sha256 = "sha256-/1jlgjvQlRZlZKAG5H0RETCBPc+L8jTvefpRqHDttI8=";