diff --git a/changelog.d/295.bugfix.rst b/changelog.d/295.bugfix.rst
new file mode 100644
index 00000000..9794bba4
--- /dev/null
+++ b/changelog.d/295.bugfix.rst
@@ -0,0 +1 @@
+treq's package metadata has been updated to require ``six >= 1.13``, noting a dependency introduced in treq 20.9.0.
diff --git a/setup.py b/setup.py
index 3b65f616..473ed2fb 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
             "incremental",
             "requests >= 2.1.0",
             "hyperlink >= 19.0.0",
-            "six",
+            "six >= 1.13.0",
             "Twisted[tls] >= 16.4.0 ; python_version < '3.7'",
             "Twisted[tls] >= 18.7.0 ; python_version >= '3.7'",
             "attrs",