diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4b4e3824..23ae3802 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,15 @@
 Changelog
 =========
 
+0.2.40 - 2023-05-17
+-------------------
+
+Fixed
+^^^^^
+
+* Added `tox` to `testing` install option to fix auto PyPi builds.
+
+
 0.2.39 - 2023-05-17
 -------------------
 
diff --git a/setup.cfg b/setup.cfg
index 36d6bb50..5b03304d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -95,6 +95,7 @@ testing =
     pytest-remotedata>=0.3.1
     pytest_mpl
     python-dotenv
+    tox
 social =
     requests
     tweepy