Bumped up the version

Author: agronholm

.github/SECURITY.md

@@ -7,8 +7,8 @@ Earlier versions are unsupported.
 
 | Version | Supported          |
 |---------| ------------------ |
-| 5.8.x   | :white_check_mark: |
-| < 5.8.x | :x:                |
+| 5.9.x   | :white_check_mark: |
+| < 5.9.x | :x:                |
 
 ## Reporting a Vulnerability
 

docs/versionhistory.rst

@@ -5,7 +5,7 @@ Version history
 
 This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
-**UNRELEASED**
+**5.9.0** (2026-03-22)
 
 - Added the ``max_depth`` decoder parameter to limit the maximum allowed nesting level of
   containers, with a default value of 400 levels (CVE-2026-26209)