diff --git a/pytest_client_tools/insights_client.py b/pytest_client_tools/insights_client.py
index 6e60160..977204d 100644
--- a/pytest_client_tools/insights_client.py
+++ b/pytest_client_tools/insights_client.py
@@ -128,6 +128,14 @@ def __getattr__(self, name):
         except configparser.NoOptionError:
             raise KeyError(name)
 
+    def __setattr__(self, name, value):
+        if name in (
+            self._KEYS_BOOL | self._KEYS_INT | self._KEYS_FLOAT | self._KEYS_STRING
+        ):
+            self._config.set("insights-client", name, str(value))
+            return
+        super().__setattr__(name, value)
+
 
 class InsightsClient:
     def __init__(self):
diff --git a/tests/test_insights_client.py b/tests/test_insights_client.py
index 5f7e95e..1481631 100644
--- a/tests/test_insights_client.py
+++ b/tests/test_insights_client.py
@@ -61,6 +61,30 @@ def test_config_existing_keys(tmp_path):
     assert isinstance(conf.http_timeout, float)
 
 
+def test_config_set_keys(tmp_path):
+    conf_file = tmp_path / "file.conf"
+    conf_file.write_text(
+        """[insights-client]
+auto_config=True
+authmethod=CERT
+cmd_timeout=120
+http_timeout=120
+        """
+    )
+    conf = InsightsClientConfig(conf_file)
+    # existing key
+    conf.cmd_timeout = 60
+    assert conf.cmd_timeout == 60
+    # missing but known key
+    with pytest.raises(KeyError):
+        assert conf.loglevel == "DEBUG"
+    conf.loglevel = "DEBUG"
+    assert conf.loglevel == "DEBUG"
+    # unknown key; setting will set a class attribute, not a config value
+    conf.unknown = "see"
+    assert conf.unknown == "see"
+
+
 def test_config_reload(tmp_path):
     conf_file = tmp_path / "file.conf"
     conf_file.write_text(