diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b6fc94e4e..faa4468f6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+1.9.1a1 (2025-02-20)
+--------------------
+
+Bug Fixes
+
+* Fix import error in dbt bigquery adapter mock for ``dbt-bigquery<1.8`` for ``ExecutionMode.AIRFLOW_ASYNC`` by @pankajkoti in #1548
+
+
 1.9.0 (2025-02-19)
 --------------------
 
diff --git a/cosmos/__init__.py b/cosmos/__init__.py
index 2103fb1b8..ceb5fce7e 100644
--- a/cosmos/__init__.py
+++ b/cosmos/__init__.py
@@ -6,7 +6,7 @@
 Contains dags, task groups, and operators.
 """
 
-__version__ = "1.9.0"
+__version__ = "1.9.1a1"
 
 
 from cosmos.airflow.dag import DbtDag