diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0442c0e5..cf147f49 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@ Unreleased
  - Refactor `tasks.py` to utilize `sasctl.pzmm` functions.
  - Add `model_info` class to better capture model information.
 
+v1.9.1 (2023-05-04)
+----------
+**Improvements**
+ - Updated handling of H2O models in `sasctl.pzmm`.
+   - Models are now saved with the appropriate `h2o` functions within the `sasctl.pzmm.PickleModel.pickle_trained_model` function.
+   - Example notebooks have been updated to reflect this change.
+
+**Bugfixes**
+ - Added check for `sasctl.pzmm.JSONFiles.calculate_model_statsistics` function to replace float NaN values invalid for JSON files.
+ - Fixed issue where the `sasctl.pzmm.JSONFiles.write_model_properties` function was replacing the user-defined model_function argument.
+ - Added NpEncoder class to check for numpy values in JSON files. Numpy-types cannot be used in SAS Viya.
+
 v1.9.0 (2023-04-04)
 ----------
 **Improvements**
diff --git a/src/sasctl/__init__.py b/src/sasctl/__init__.py
index 9671659b..40ce44bd 100644
--- a/src/sasctl/__init__.py
+++ b/src/sasctl/__init__.py
@@ -4,7 +4,7 @@
 # Copyright © 2019, SAS Institute Inc., Cary, NC, USA.  All Rights Reserved.
 # SPDX-License-Identifier: Apache-2.0
 
-__version__ = "1.9.0"
+__version__ = "1.9.1"
 __author__ = "SAS"
 __credits__ = [
     "Yi Jian Ching",