diff --git a/pkgs/development/python-modules/jsbeautifier/default.nix b/pkgs/development/python-modules/jsbeautifier/default.nix
index 9b2d3a5b832e..2ca26ad65e8c 100644
--- a/pkgs/development/python-modules/jsbeautifier/default.nix
+++ b/pkgs/development/python-modules/jsbeautifier/default.nix
@@ -1,18 +1,26 @@
-{ lib, fetchPypi, buildPythonApplication, EditorConfig, pytest, six }:
+{ lib, fetchPypi, buildPythonApplication, EditorConfig, fetchpatch, pytest, six }:
 
 buildPythonApplication rec {
   pname = "jsbeautifier";
-  version = "1.8.9";
+  version = "1.9.1";
 
-  propagatedBuildInputs = [ six ];
-
-  buildInputs = [ EditorConfig pytest ];
+  propagatedBuildInputs = [ six EditorConfig ];
+  checkInputs = [ pytest ];
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "7d02baa9b0459bf9c5407c1b99ad5566de04a3b664b18a58ac64f52832034204";
+    sha256 = "0q8ld072dkccssagjxyvc9633fb6ynflvz70924phgp3zxmim960";
   };
 
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/beautify-web/js-beautify/commit/78e35a11cbb805fc044241d6465800ee2bd57ebc.patch";
+      sha256 = "1ah7nshk96yljy37i20v4fga834dix9cdbhkdc3flfm4904n4523";
+    })
+  ];
+
+  patchFlags = [ "-p2" ];
+
   meta = with lib; {
     homepage    = "http://jsbeautifier.org";
     description = "JavaScript unobfuscator and beautifier.";