diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ca3f1a7..898a17a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,13 @@ Release History
 
 ### Pending
 
+### Version 9.1.1
+
+Released on Dec 16, 2023
+
+#### Update
+- improve: add the missing `create_at` field to `GetTransactionResponse`. ([#849](https://github.com/StellarCN/py-stellar-base/pull/849))
+
 ### Version 9.1.0
 
 Released on Dec 16, 2023
diff --git a/pyproject.toml b/pyproject.toml
index aa24f425..e82fb9fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "stellar-sdk"
-version = "9.1.0"
+version = "9.1.1"
 description = "The Python Stellar SDK library provides APIs to build transactions and connect to Horizon and Soroban-RPC server."
 authors = [
     "overcat <4catcode@gmail.com>",
diff --git a/stellar_sdk/__version__.py b/stellar_sdk/__version__.py
index a4f2eacc..6753d4a8 100644
--- a/stellar_sdk/__version__.py
+++ b/stellar_sdk/__version__.py
@@ -11,7 +11,7 @@
 __description__ = "The Python Stellar SDK library provides APIs to build transactions and connect to Horizon and Soroban-RPC server."
 __url__ = "https://github.com/StellarCN/py-stellar-base"
 __issues__ = f"{__url__}/issues"
-__version__ = "9.1.0"
+__version__ = "9.1.1"
 __author__ = "Eno, overcat"
 __author_email__ = "appweb.cn@gmail.com, 4catcode@gmail.com"
 __license__ = "Apache License 2.0"