diff --git a/README.md b/README.md
index a409e66..d655e05 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ with `cachetools`.
 - `cached` decorator: a cachetools replacement which allows to test if a
   function result is in cache, and to delete such an entry.
 - `cacheFunctions` and `cacheMethods`: add caching to functions or methods.
+- `json_key` and `hash_json_key`: JSON-based cache key serialization functions
 
 ## License
 
diff --git a/docs/VERSIONS.md b/docs/VERSIONS.md
index 9ae7de1..dea8476 100644
--- a/docs/VERSIONS.md
+++ b/docs/VERSIONS.md
@@ -19,7 +19,7 @@ Install [package](https://pypi.org/project/CacheToolsUtils/) from
   Maybe the existing client can do that with appropriate options?
 - `cached`: add `contains` and `delete` parameters to change names?
 
-## ? on ?
+## 9.1 on 2024-11-28
 
 Improve documentation.
 Add experimental `json_key` and `hash_json_key` cache key functions.
diff --git a/pyproject.toml b/pyproject.toml
index 7f29086..e11d847 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "CacheToolsUtils"
-version = "9.0"
+version = "9.1"
 authors = [ { name = "Fabien Coelho", email = "cachetools.utils@coelho.net" } ]
 description = "Cachetools Utilities"
 readme = "README.md"