diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 2055bd6..2593e15 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,10 +1,10 @@
 Changelog
 =========
 
-6.4.0 (unreleased)
+6.3.1 (2022-10-17)
 ------------------
 
-- Nothing changed yet.
+- Remove upper bound for kinto version (#567)
 
 
 6.3.0 (2022-04-20)
diff --git a/setup.py b/setup.py
index e934feb..e48b208 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,7 @@
 
 setup(
     name='kinto-attachment',
-    version='6.4.0.dev0',
+    version='6.3.1',
     description="Attach files to Kinto records",
     long_description=readme + '\n\n' + history,
     author="Mozilla",