diff --git a/pkgs/development/python-modules/curio/default.nix b/pkgs/development/python-modules/curio/default.nix
new file mode 100644
index 00000000000..65d225dc377
--- /dev/null
+++ b/pkgs/development/python-modules/curio/default.nix
@@ -0,0 +1,34 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, isPy3k
+, pytest
+, sphinx
+}:
+
+buildPythonPackage rec {
+  pname = "curio";
+  version = "0.9";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "51d1a7b49b4f8dd1486ac785c72d522962e93ccfdcfc1f818f5c7553a307b5ef";
+  };
+
+  disabled = !isPy3k;
+
+  checkInputs = [ pytest sphinx ];
+
+  # test_aside_basic times out,
+  # test_aside_cancel fails because modifies PYTHONPATH and cant find pytest
+  checkPhase = ''
+    pytest --deselect tests/test_task.py::test_aside_basic --deselect tests/test_task.py::test_aside_cancel
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/dabeaz/curio";
+    description = "Library for performing concurrent I/O with coroutines in Python 3";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.marsam ];
+  };
+}
diff --git a/pkgs/development/python-modules/sniffio/default.nix b/pkgs/development/python-modules/sniffio/default.nix
index 9893bc5828a..f5674c09e02 100644
--- a/pkgs/development/python-modules/sniffio/default.nix
+++ b/pkgs/development/python-modules/sniffio/default.nix
@@ -1,26 +1,27 @@
 { buildPythonPackage, lib, fetchPypi, glibcLocales, isPy3k, contextvars
-, pythonOlder
+, pythonOlder, pytest, curio
 }:
 
 buildPythonPackage rec {
   pname = "sniffio";
-  version = "1.0.0";
+  version = "1.1.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1dzb0nx3m1hpjgsv6s6w5ac2jcmywcz6gqnfkw8rwz1vkr1836rf";
+    sha256 = "8e3810100f69fe0edd463d02ad407112542a11ffdc29f67db2bf3771afb87a21";
   };
 
-  # breaks with the following error:
-  # > TypeError: 'encoding' is an invalid keyword argument for this function
   disabled = !isPy3k;
 
   buildInputs = [ glibcLocales ];
 
   propagatedBuildInputs = lib.optionals (pythonOlder "3.7") [ contextvars ];
 
-  # no tests distributed with PyPI
-  doCheck = false;
+  checkInputs = [ pytest curio ];
+
+  checkPhase = ''
+    pytest
+  '';
 
   meta = with lib; {
     homepage = https://github.com/python-trio/sniffio;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index def44703e4b..ebb423c4732 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -335,6 +335,8 @@ in {
 
   cozy = callPackage ../development/python-modules/cozy { };
 
+  curio = callPackage ../development/python-modules/curio { };
+
   dendropy = callPackage ../development/python-modules/dendropy { };
 
   dependency-injector = callPackage ../development/python-modules/dependency-injector { };