diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 0464d67..79919d7 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -23,7 +23,7 @@ reported the issue. Please try to include as much information as you can. Detail
 ## Contributing via Pull Requests
 Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
 
-1. You are working against the latest source on the *master* branch.
+1. You are working against the latest source on the *main* branch.
 2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
 3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
 
diff --git a/requirements/base.txt b/requirements/base.txt
index eb0e59b..b5d6079 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,2 +1,2 @@
-simplejson==3.17.2
+simplejson==3.17.5
 importlib-metadata ~= 2.0 ; python_version < "3.8"
diff --git a/tests/test_bootstrap.py b/tests/test_bootstrap.py
index b6f4b23..a45950b 100644
--- a/tests/test_bootstrap.py
+++ b/tests/test_bootstrap.py
@@ -1151,7 +1151,7 @@ def test_run(self, mock_runtime_client, mock_handle_event_request):
         "awslambdaric.bootstrap.LambdaLoggerHandler",
         Mock(side_effect=Exception("Boom!")),
     )
-    @patch("awslambdaric.bootstrap.build_fault_result", MagicMock())
+    @patch("awslambdaric.bootstrap.build_fault_result", MagicMock(return_value={}))
     @patch("awslambdaric.bootstrap.log_error", MagicMock())
     @patch("awslambdaric.bootstrap.LambdaRuntimeClient", MagicMock())
     @patch("awslambdaric.bootstrap.sys")