diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef5baf7e..2e368c39 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Future CHANGELOG entries will be documented under the [release notes on GitHub](https://github.com/QuantEcon/QuantEcon.py/releases)
 
+## Ver 0.12.0 (24th-September-2026)
+
+See [release notes](https://github.com/QuantEcon/QuantEcon.py/releases/tag/v0.12.0)
+
 ## Ver 0.11.4 (14th-July-2026)
 
 See [release notes](https://github.com/QuantEcon/QuantEcon.py/releases/tag/v0.11.4)
diff --git a/CITATION.cff b/CITATION.cff
index 6c9815fe..ac4f73d3 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -31,6 +31,8 @@ authors:
 - family-names: Zhang
   given-names: Hengcheng
 doi: 10.5281/zenodo.10345102
+version: 0.12.0
+date-released: 2026-09-24
 message: If you use this software, please cite our article in the
   Journal of Open Source Software.
 preferred-citation:
diff --git a/quantecon/__init__.py b/quantecon/__init__.py
index fabf9ab2..424fb361 100644
--- a/quantecon/__init__.py
+++ b/quantecon/__init__.py
@@ -3,7 +3,7 @@
 Import the main names to top level.
 """
 
-__version__ = '0.11.4'
+__version__ = '0.12.0'
 
 try:
     import numba