diff --git a/pkgs/development/python-modules/sybil/default.nix b/pkgs/development/python-modules/sybil/default.nix
index 55cea70924e6..41baf697fff3 100644
--- a/pkgs/development/python-modules/sybil/default.nix
+++ b/pkgs/development/python-modules/sybil/default.nix
@@ -7,14 +7,14 @@
 
 buildPythonApplication rec {
   pname = "sybil";
-  version = "3.0.0";
+  version = "3.0.1";
   format = "setuptools";
 
   disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-dpLtZueT5eea5qcM8s+GGRftSOr/DYrfgl5k2Fgg8lE=";
+    hash = "sha256-bwLcIgSvflohIDeSTZdPcngfbcGP08RMx85GOhIPUw0=";
   };
 
   checkInputs = [
@@ -22,7 +22,7 @@ buildPythonApplication rec {
   ];
 
   disabledTests = [
-    # sensitive to output of other commands
+    # Sensitive to output of other commands
     "test_namespace"
     "test_unittest"
   ];
diff --git a/pkgs/development/python-modules/testfixtures/default.nix b/pkgs/development/python-modules/testfixtures/default.nix
index 93fc92bd6320..91f91a3d7b17 100644
--- a/pkgs/development/python-modules/testfixtures/default.nix
+++ b/pkgs/development/python-modules/testfixtures/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "testfixtures";
-  version = "6.18.3";
+  version = "6.18.5";
   format = "setuptools";
   # DO NOT CONTACT upstream.
   # https://github.com/simplistix/ is only concerned with internal CI process.
@@ -25,12 +25,9 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-JgAQCulv/QgjNLN441VVD++LSlKab6TDT0cTCQXHQm0=";
+    hash = "sha256-Atrog/Vn9bcP0608nu+5WRLniskL5sdES14vRr9XLIQ=";
   };
 
-  # no longer compatible with sybil
-  # https://github.com/simplistix/testfixtures/issues/169
-  doCheck = false;
   checkInputs = [
     mock
     pytestCheckHook
@@ -44,19 +41,6 @@ buildPythonPackage rec {
     "testfixtures/tests/test_django"
   ];
 
-  disabledTests = lib.optionals (pythonAtLeast "3.10") [
-    # https://github.com/simplistix/testfixtures/issues/168
-    "test_invalid_communicate_call"
-    "test_invalid_kill"
-    "test_invalid_parameters"
-    "test_invalid_poll"
-    "test_invalid_send_signal"
-    "test_invalid_terminate"
-    "test_invalid_wait_call"
-    "test_replace_delattr_cant_remove"
-    "test_replace_delattr_cant_remove_not_strict"
-  ];
-
   pytestFlagsArray = [
     "testfixtures/tests"
   ];