diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f269bc92..4c48dc5e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -5,7 +5,7 @@ Change log
 .. Headline template:
    X.Y.Z (YYYY-MM-DD)
 
-3.1.0 (unreleased)
+3.1.0 (2022-06-01)
 ==================
 
 - Add new FastAPI middleware ``CaseInsensitiveQueryMiddleware`` to aid in implementing the IVOA protocol requirement that the keys of query parameters be case-isensitive.