diff --git a/releasenotes/notes/remove-py39-a3f911847e0075b6.yaml b/releasenotes/notes/remove-py39-a3f911847e0075b6.yaml
new file mode 100644
index 0000000..eaf3014
--- /dev/null
+++ b/releasenotes/notes/remove-py39-a3f911847e0075b6.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 3.9 has been removed. Now Python 3.10 is the minimum
+    version supported.
diff --git a/setup.cfg b/setup.cfg
index 8936365..34a9be3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,7 @@ license = Apache License, Version 2.0
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://opendev.org/openstack/python-observabilityclient
-python_requires = >=3.9
+python_requires = >=3.10
 classifier =
     Environment :: Console
     Environment :: OpenStack
@@ -20,7 +20,6 @@ classifier =
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12