diff --git a/pkgs/development/python-modules/flask/default.nix b/pkgs/development/python-modules/flask/default.nix
index 67cd9aa457e..df39b2ea725 100644
--- a/pkgs/development/python-modules/flask/default.nix
+++ b/pkgs/development/python-modules/flask/default.nix
@@ -2,12 +2,12 @@
 , itsdangerous, click, werkzeug, jinja2, pytest }:
 
 buildPythonPackage rec {
-  version = "1.0.2";
+  version = "1.0.3";
   pname = "Flask";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "2271c0070dbcb5275fad4a82e29f23ab92682dc45f9dfbc22c02ba9b9322ce48";
+    sha256 = "ad7c6d841e64296b962296c2c2dabc6543752985727af86a975072dea984b6f3";
   };
 
   checkInputs = [ pytest ];