Release candidate 1.9 (#746)

IAMconsortium · May 22, 2023 · 110bfa9 · 110bfa9
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diff --git a/README.md b/README.md
@@ -137,7 +137,7 @@ doi: [10.21105/joss.01095](https://doi.org/10.21105/joss.01095).
 License
 -------
 
-Copyright 2017-2022 IIASA and the pyam developer team
+Copyright 2017-2023 IIASA and the pyam developer team
 
 The **pyam** package is licensed
 under the Apache License, Version 2.0 (the "License");  

diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
@@ -1,6 +1,15 @@
-# Next Release
+# Release v1.9.0
 
-- [#742](https://github.com/IAMconsortium/pyam/pull/742) Fix an issue when concatenating only pd.DataFrame objects 
+## Highlights
+
+- Ensure compatibility with **pandas v2.0**
+- Add **Python 3.11** to supported versions
+- Fix an issue when concatenating a list of **pd.DataFrame** objects 
+
+## Individual updates
+
+- [#745](https://github.com/IAMconsortium/pyam/pull/745) Add Python 3.11 to supported versions
+- [#742](https://github.com/IAMconsortium/pyam/pull/742) Fix an issue when concatenating only pd.DataFrame objects
 - [#739](https://github.com/IAMconsortium/pyam/pull/739) Ensure compatibility with **pandas v2.0**
 
 # Release v1.8.0

diff --git a/manuscripts/ORE/source/conf.py b/manuscripts/ORE/source/conf.py
@@ -18,7 +18,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "pyam"
-copyright = "2021 Huppmann, Gidden, et al."
+copyright = "2023 IIASA and the pyam developer team"
 author = "Daniel Huppmann, Matthew Gidden, et al."