diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b0f47b5..038327f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "9.15.0"
+  ".": "9.15.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 363df62..92ef100 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to the LaunchDarkly Python SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [9.15.1](https://github.com/launchdarkly/python-server-sdk/compare/9.15.0...9.15.1) (2026-02-24)
+
+
+### Bug Fixes
+
+* Improve fallback behavior when using custom data system configuration ([#407](https://github.com/launchdarkly/python-server-sdk/issues/407)) ([60272b2](https://github.com/launchdarkly/python-server-sdk/commit/60272b2881847de04a5b771e6d28f3deefc1222d))
+
 ## [9.15.0](https://github.com/launchdarkly/python-server-sdk/compare/9.14.1...9.15.0) (2026-02-10)
 
 
diff --git a/PROVENANCE.md b/PROVENANCE.md
index e5d7d71..9509484 100644
--- a/PROVENANCE.md
+++ b/PROVENANCE.md
@@ -9,7 +9,7 @@ To verify SLSA provenance attestations, we recommend using [slsa-verifier](https
 <!-- x-release-please-start-version -->
 ```
 # Set the version of the SDK to verify
-SDK_VERSION=9.15.0
+SDK_VERSION=9.15.1
 ```
 <!-- x-release-please-end -->
 
diff --git a/ldclient/version.py b/ldclient/version.py
index 1986b70..559d3d4 100644
--- a/ldclient/version.py
+++ b/ldclient/version.py
@@ -1 +1 @@
-VERSION = "9.15.0"  # x-release-please-version
+VERSION = "9.15.1"  # x-release-please-version
diff --git a/pyproject.toml b/pyproject.toml
index 8acb2df..e382f89 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "launchdarkly-server-sdk"
-version = "9.15.0"
+version = "9.15.1"
 description = "LaunchDarkly SDK for Python"
 authors = ["LaunchDarkly <dev@launchdarkly.com>"]
 license = "Apache-2.0"