diff --git a/CHANGES.rst b/CHANGES.rst
index 61c4c1a6..c7847af3 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -7,6 +7,8 @@
 
 - Expanded origin db string length. [#326]
 
+- Updated minimum python version to 3.9. [#325]
+
 0.17.1 (2023-08-03)
 -------------------
 
diff --git a/pyproject.toml b/pyproject.toml
index 42ca8608..e4a7d08c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 name = 'rad'
 description = 'Roman Attribute Dictionary'
 readme = { file = 'README.md', content-type = 'text/markdown' }
-requires-python = '>=3.6'
+requires-python = '>=3.9'
 license = { file = 'LICENSE' }
 authors = [{ name = 'STScI', email = 'help@stsci.edu' }]
 classifiers = [