diff --git a/tests/test_invocation_contexts.py b/tests/test_invocation_contexts.py
index bed21716..657e6347 100644
--- a/tests/test_invocation_contexts.py
+++ b/tests/test_invocation_contexts.py
@@ -225,7 +225,7 @@ def run_function_in_thread_and_propagate_cancellation(func, *args):
     t = ThreadWithInvocationID(target=func, args=args)
     t.start()
     try:
-        t.join_and_propagate_cancel(1)
+        t.join_and_propagate_cancel(0.04)
     except InvocationCancelledError:
         # We still want to return the finished thread if it's
         # cancelled.
diff --git a/tests/test_server_config_model.py b/tests/test_server_config_model.py
index 11010282..6f9cb525 100644
--- a/tests/test_server_config_model.py
+++ b/tests/test_server_config_model.py
@@ -109,14 +109,14 @@ def test_unimportable_modules():
 
     with pytest.raises(
         ThingImportFailure,
-        match="\[RuntimeError\] This module should not be importable!",
+        match=r"\[RuntimeError\] This module should not be importable!",
     ):
         # This checks RuntimErrors get reported with a single error
         ThingConfig(cls="tests.unimportable.runtimeerror:SomeClass")
 
     with pytest.raises(
         ThingImportFailure,
-        match="\[ValueError\] This module should not be importable due to ValueError!",
+        match=r"\[ValueError\] This module should not be importable due to ValueError!",
     ):
         # This checks ValueErrors get reported with a single error
         # rather than getting swallowed by a ValidationError