diff --git a/pyproject.toml b/pyproject.toml
index 7ed264f..11b30ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "trace-client"
-version = "0.4.1"
+version = "0.4.2"
 description = "One call to report that a program was used, to a trace server. Standard library only, Python 3.8+."
 readme = "README.md"
 license = {text = "MIT"}
diff --git a/tests/test_trace_client.py b/tests/test_trace_client.py
index dfa61b2..a050666 100644
--- a/tests/test_trace_client.py
+++ b/tests/test_trace_client.py
@@ -293,12 +293,12 @@ def test_environment_opts_out_reads_only_the_mapping_it_is_given(self):
 
     def test_user_agent_names_the_client_version(self):
         from trace_client import __version__
-        self.assertEqual("0.4.1", __version__)
+        self.assertEqual("0.4.2", __version__)
         client = TraceClient(self.base_url, "MyGame", "1.2.3", key="k")
         client.report("startup")
         self.assertTrue(self.capture.arrived.wait(5))
         client.close()
-        self.assertEqual("trace-client-python/0.4.1 (MyGame)", self.capture.requests[0]["user_agent"])
+        self.assertEqual("trace-client-python/0.4.2 (MyGame)", self.capture.requests[0]["user_agent"])
 
     def test_every_place_the_version_is_written_agrees_with_version(self):
         # A vendored copy is identified by its header, an installed one by
diff --git a/trace_client/__init__.py b/trace_client/__init__.py
index 6a3d764..85e631f 100644
--- a/trace_client/__init__.py
+++ b/trace_client/__init__.py
@@ -1,4 +1,4 @@
-"""trace-client 0.4.1 -- https://github.com/Stephenson-Software/trace-client-python
+"""trace-client 0.4.2 -- https://github.com/Stephenson-Software/trace-client-python
 
 One call to report that a program was used. Copy ``trace_client.py`` (this
 package's single module) into a project as is, or vendor the package; either
diff --git a/trace_client/trace_client.py b/trace_client/trace_client.py
index 6f08222..9a7affc 100644
--- a/trace_client/trace_client.py
+++ b/trace_client/trace_client.py
@@ -1,4 +1,4 @@
-"""trace-client 0.4.1 -- https://github.com/Stephenson-Software/trace-client-python
+"""trace-client 0.4.2 -- https://github.com/Stephenson-Software/trace-client-python
 
 One call to report that a program was used. Copy this file into a project as
 is, or vendor the package; either way there is nothing else to add. Standard
@@ -19,7 +19,7 @@
 import uuid
 from typing import Dict, Mapping, Optional, Union
 
-__version__ = "0.4.1"
+__version__ = "0.4.2"
 
 _LOG = logging.getLogger("trace")