diff --git a/pkgs/development/python-modules/ujson/default.nix b/pkgs/development/python-modules/ujson/default.nix
index 987347c86951..4becc946035f 100644
--- a/pkgs/development/python-modules/ujson/default.nix
+++ b/pkgs/development/python-modules/ujson/default.nix
@@ -5,6 +5,7 @@
 , pytestCheckHook
 , pythonOlder
 , setuptools-scm
+, fetchpatch
 }:
 
 buildPythonPackage rec {
@@ -17,6 +18,14 @@ buildPythonPackage rec {
     sha256 = "a88944d2f99db71a3ca0c63d81f37e55b660edde0b07216fb65a3e46403ef004";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "CVE-2022-31117.patch";
+      url = "https://github.com/ultrajson/ultrajson/commit/b21da40ead640b6153783dad506e68b4024056ef.patch";
+      sha256 = "sha256-H8cxJ54ESZqtvJzC1W7Dl7WmdApxhLeSllsQW3uG1yc=";
+    })
+  ];
+
   nativeBuildInputs = [
     setuptools-scm
   ];