diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 3b9e2aabe..c63c730dc 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  "packages/toolbox-langchain": "1.3.0",
+  "packages/toolbox-langchain": "1.3.1",
   "packages/toolbox-core": "1.3.0",
   "packages/toolbox-llamaindex": "0.8.0",
   "packages/toolbox-adk": "1.3.1"
diff --git a/packages/toolbox-langchain/CHANGELOG.md b/packages/toolbox-langchain/CHANGELOG.md
index 4ea4ed194..2c88b9f11 100644
--- a/packages/toolbox-langchain/CHANGELOG.md
+++ b/packages/toolbox-langchain/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## [1.3.1](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v1.3.0...toolbox-langchain-v1.3.1) (2026-08-27)
+
+
+### Features
+
+* **langchain:** pass telemetry attributes ([#740](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/740)) ([c74c7e0](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/c74c7e0ef00632cea4a82aaf6c14926900d4d4b9))
+* **langchain:** support secure parameters in langchain tools and clients ([bff0b2f](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/bff0b2ff9d5fde705a821ed650d451422151b992))
+
+
+### Miscellaneous Chores
+
+* **deps-dev:** bump pillow in /packages/toolbox-langchain ([#768](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/768)) ([b747b42](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/b747b4228269ce66a372592926d2825c67c03d37))
+* **deps:** update mcp toolbox server version in integration tests to v1.9.0 ([#770](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/770)) ([fefc2c6](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/fefc2c656ade41c8671c98103d4a03cb896c6bd3))
+* release 1.3.1 ([#759](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/759)) ([4b9dd77](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/4b9dd77bf752edaefc084894367cd3fab4cfb1be))
+
 ## [1.3.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v1.2.0...toolbox-langchain-v1.3.0) (2026-07-28)
 
 
diff --git a/packages/toolbox-langchain/src/toolbox_langchain/version.py b/packages/toolbox-langchain/src/toolbox_langchain/version.py
index 4f78e99d5..18cb9bf0e 100644
--- a/packages/toolbox-langchain/src/toolbox_langchain/version.py
+++ b/packages/toolbox-langchain/src/toolbox_langchain/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.3.0"
+__version__ = "1.3.1"