diff --git a/pkgs/development/python-modules/trio/default.nix b/pkgs/development/python-modules/trio/default.nix
index ca262f77346..c38011978d0 100644
--- a/pkgs/development/python-modules/trio/default.nix
+++ b/pkgs/development/python-modules/trio/default.nix
@@ -2,6 +2,7 @@
 , attrs
 , sortedcontainers
 , async_generator
+, exceptiongroup
 , idna
 , outcome
 , pytestCheckHook
@@ -18,11 +19,12 @@
 buildPythonPackage rec {
   pname = "trio";
   version = "0.22.0";
+  format = "setuptools";
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-zmjxxUAKR7E3xaTecsfJAb1OeiT73r/ptB3oxsBOqs8=";
+    hash = "sha256-zmjxxUAKR7E3xaTecsfJAb1OeiT73r/ptB3oxsBOqs8=";
   };
 
   propagatedBuildInputs = [
@@ -32,6 +34,8 @@ buildPythonPackage rec {
     idna
     outcome
     sniffio
+  ] ++ lib.optionals (pythonOlder "3.11") [
+    exceptiongroup
   ];
 
   # tests are failing on Darwin