diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2ca3e9b9..0eeda54d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,5 +1,5 @@
 {
-  "packages/toolbox-langchain": "0.5.10",
+  "packages/toolbox-langchain": "0.6.0",
   "packages/toolbox-core": "0.5.10",
   "packages/toolbox-llamaindex": "0.5.10",
   "packages/toolbox-adk": "0.6.1"
diff --git a/packages/toolbox-langchain/CHANGELOG.md b/packages/toolbox-langchain/CHANGELOG.md
index e2705d09..9dd9030c 100644
--- a/packages/toolbox-langchain/CHANGELOG.md
+++ b/packages/toolbox-langchain/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## [0.6.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.10...toolbox-langchain-v0.6.0) (2026-02-27)
+
+
+### ⚠ BREAKING CHANGES
+
+* remove legacy Native Toolbox HTTP transport ([#566](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/566))
+
+### Features
+
+* remove legacy Native Toolbox HTTP transport ([#566](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/566)) ([6a55554](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/6a55554a1c53030fd25b6a6de44ea9603b5201a3))
+
 ## [0.5.10](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.9...toolbox-langchain-v0.5.10) (2026-02-27)
 
 ### Bug Fixes
diff --git a/packages/toolbox-langchain/src/toolbox_langchain/version.py b/packages/toolbox-langchain/src/toolbox_langchain/version.py
index ef582ad8..8f4814f3 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__ = "0.5.10"
+__version__ = "0.6.0"