diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4e02cd5c59..03da62bd9d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -22,7 +22,12 @@ individual files.
 
 The changes are now listed with the most recent at the top.
 
-**November 22 2021 :: Bug fix for groups with posterior spatially-varying adaptive inflation. Tag: v9.12.13**
+**December 7 2021 :: Refactored filter_assim. Tag: v9.12.0**
+
+- Filter_assim refactored so each process calcuates increments
+- Code readability changes 
+
+**November 22 2021 :: Bug fix for groups with posterior spatially-varying adaptive inflation. Tag: v9.11.13**
 
 - Removed the additional outlier threshold test for each group when using posterior 
   spatially-varying adaptive inflation. The outlier test is done for the entire ensemble
diff --git a/conf.py b/conf.py
index 97111ea469..8294d0277e 100644
--- a/conf.py
+++ b/conf.py
@@ -21,7 +21,7 @@
 author = 'Data Assimilation Research Section'
 
 # The full version, including alpha/beta/rc tags
-release = '9.11.13'
+release = '9.12.0'
 master_doc = 'README'
 
 # -- General configuration ---------------------------------------------------