diff --git a/CHANGES.md b/CHANGES.md
index ffa7e0f..3c60fd5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # `bw2io` Changelog
 
+### 0.9.DEV29 (2024-07-09)
+
+* Restore Python 3.9 compatibility
+* Compatibility with SimaPro multifunctionality via `bw_simapro_csv` and `multifunctional`.
+
 ### 0.9.DEV28 (2024-06-21)
 
 * Allow imports of some invalid ecospold1 files
diff --git a/bw2io/__init__.py b/bw2io/__init__.py
index c63a549..8d3dd75 100644
--- a/bw2io/__init__.py
+++ b/bw2io/__init__.py
@@ -48,7 +48,7 @@
     "useeio20",
 ]
 
-__version__ = "0.9.DEV28"
+__version__ = "0.9.DEV29"
 
 from .backup import (
     backup_data_directory,