diff --git a/pkgs/development/python-modules/h11/default.nix b/pkgs/development/python-modules/h11/default.nix
index ecfb37eeda5..42ebf1b81da 100644
--- a/pkgs/development/python-modules/h11/default.nix
+++ b/pkgs/development/python-modules/h11/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "h11";
-  version = "0.8.1";
+  version = "0.9.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "acca6a44cb52a32ab442b1779adf0875c443c689e9e028f8d831a3769f9c5208";
+    sha256 = "1qfad70h59hya21vrzz8dqyyaiqhac0anl2dx3s3k80gpskvrm1k";
   };
 
   checkInputs = [ pytest ];