diff --git a/changelog/4279.trivial.rst b/changelog/4279.trivial.rst
new file mode 100644
index 000000000..8a8275049
--- /dev/null
+++ b/changelog/4279.trivial.rst
@@ -0,0 +1 @@
+Improve message and stack level of warnings issued by ``monkeypatch.setenv`` when the value of the environment variable is not a ``str``.
\ No newline at end of file