diff --git a/pkgs/development/python-modules/tornado/4.nix b/pkgs/development/python-modules/tornado/4.nix
index e4f59c148735..7476a22792ee 100644
--- a/pkgs/development/python-modules/tornado/4.nix
+++ b/pkgs/development/python-modules/tornado/4.nix
@@ -2,6 +2,7 @@
 , unittestCheckHook
 , buildPythonPackage
 , fetchPypi
+, fetchpatch
 , isPy27
 , pythonAtLeast
 }:
@@ -16,6 +17,14 @@ buildPythonPackage rec {
     sha256 = "02jzd23l4r6fswmwxaica9ldlyc2p6q8dk6dyff7j58fmdzf853d";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "CVE-2023-28370.patch";
+      url = "https://github.com/tornadoweb/tornado/commit/32ad07c54e607839273b4e1819c347f5c8976b2f.patch";
+      hash = "sha256-2dpPHkNThOaZD8T2g1vb/I5WYZ/vy/t690539uprJyc=";
+    })
+  ];
+
   nativeCheckInputs = [ unittestCheckHook ];
 
   # We specify the name of the test files to prevent
diff --git a/pkgs/development/python-modules/tornado/5.nix b/pkgs/development/python-modules/tornado/5.nix
index d3961d06c405..8ba3a8c073ba 100644
--- a/pkgs/development/python-modules/tornado/5.nix
+++ b/pkgs/development/python-modules/tornado/5.nix
@@ -2,6 +2,7 @@
 , unittestCheckHook
 , buildPythonPackage
 , fetchPypi
+, fetchpatch
 , isPy27
 , pythonAtLeast
 }:
@@ -16,6 +17,14 @@ buildPythonPackage rec {
     sha256 = "4e5158d97583502a7e2739951553cbd88a72076f152b4b11b64b9a10c4c49409";
   };
 
+  patches = [
+    (fetchpatch {
+      name = "CVE-2023-28370.patch";
+      url = "https://github.com/tornadoweb/tornado/commit/32ad07c54e607839273b4e1819c347f5c8976b2f.patch";
+      hash = "sha256-2dpPHkNThOaZD8T2g1vb/I5WYZ/vy/t690539uprJyc=";
+    })
+  ];
+
   nativeCheckInputs = [ unittestCheckHook ];
 
   # We specify the name of the test files to prevent
diff --git a/pkgs/development/python-modules/tornado/default.nix b/pkgs/development/python-modules/tornado/default.nix
index e255e603b9a1..ac57f212d229 100644
--- a/pkgs/development/python-modules/tornado/default.nix
+++ b/pkgs/development/python-modules/tornado/default.nix
@@ -3,17 +3,29 @@
 , buildPythonPackage
 , fetchFromGitHub
 , pytestCheckHook
+
+# for passthru.tests
+, distributed
+, jupyter-server
+, jupyterlab
+, matplotlib
+, mitmproxy
+, pytest-tornado
+, pytest-tornasync
+, pyzmq
+, sockjs-tornado
+, urllib3
 }:
 
 buildPythonPackage rec {
   pname = "tornado";
-  version = "6.2.0";
+  version = "6.3.3";
 
   src = fetchFromGitHub {
     owner = "tornadoweb";
     repo = "tornado";
     rev = "v${version}";
-    hash = "sha256-IV0QN3GqoclFo9kWJVc21arypmBkvUClo86Zmt/Gv6E=";
+    hash = "sha256-l9Ce/c2wDSmsySr9yXu5Fl/+63QkQay46aDSUTJmetA=";
   };
 
   nativeCheckInputs = [
@@ -38,6 +50,20 @@ buildPythonPackage rec {
 
   __darwinAllowLocalNetworking = true;
 
+  passthru.tests = {
+    inherit
+      distributed
+      jupyter-server
+      jupyterlab
+      matplotlib
+      mitmproxy
+      pytest-tornado
+      pytest-tornasync
+      pyzmq
+      sockjs-tornado
+      urllib3;
+  };
+
   meta = with lib; {
     description = "A web framework and asynchronous networking library";
     homepage = "https://www.tornadoweb.org/";