diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index bb1ad15b..76f4a193 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,6 +1,6 @@
 {
-  "packages/toolbox-langchain": "0.5.7",
-  "packages/toolbox-core": "0.5.7",
-  "packages/toolbox-llamaindex": "0.5.7",
-  "packages/toolbox-adk": "0.5.7"
+  "packages/toolbox-langchain": "0.5.8",
+  "packages/toolbox-core": "0.5.8",
+  "packages/toolbox-llamaindex": "0.5.8",
+  "packages/toolbox-adk": "0.5.8"
 }
\ No newline at end of file
diff --git a/packages/toolbox-adk/CHANGELOG.md b/packages/toolbox-adk/CHANGELOG.md
index 039b71bc..8344ddf7 100644
--- a/packages/toolbox-adk/CHANGELOG.md
+++ b/packages/toolbox-adk/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.5.8](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-adk-v0.5.7...toolbox-adk-v0.5.8) (2026-01-16)
+
+
+### Bug Fixes
+
+* **adk:** add missing [@override](https://github.com/override) decorator to close method ([#502](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/502)) ([fc376a4](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/fc376a41bd928465bc34866c8ce539e3c4620ded))
+
 ## [0.5.7](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-adk-v0.5.6...toolbox-adk-v0.5.7) (2026-01-13)
 
 
diff --git a/packages/toolbox-adk/pyproject.toml b/packages/toolbox-adk/pyproject.toml
index efc4f12f..d61e8edf 100644
--- a/packages/toolbox-adk/pyproject.toml
+++ b/packages/toolbox-adk/pyproject.toml
@@ -19,7 +19,7 @@ classifiers = [
 ]
 requires-python = ">=3.10"
 dependencies = [
-    "toolbox-core==0.5.7",              # x-release-please-version
+    "toolbox-core==0.5.8",              # x-release-please-version
     "google-auth>=2.43.0,<3.0.0",
     "google-auth-oauthlib>=1.2.0,<2.0.0",
     "google-adk>=1.20.0,<2.0.0", 
diff --git a/packages/toolbox-adk/src/toolbox_adk/version.py b/packages/toolbox-adk/src/toolbox_adk/version.py
index d99d73a7..9e6eaa21 100644
--- a/packages/toolbox-adk/src/toolbox_adk/version.py
+++ b/packages/toolbox-adk/src/toolbox_adk/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.5.7"
+__version__ = "0.5.8"
diff --git a/packages/toolbox-core/CHANGELOG.md b/packages/toolbox-core/CHANGELOG.md
index fd00b075..82b69bcf 100644
--- a/packages/toolbox-core/CHANGELOG.md
+++ b/packages/toolbox-core/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.5.8](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.5.7...toolbox-core-v0.5.8) (2026-01-16)
+
+
+### Bug Fixes
+
+* **mcp:** correctly propagate client headers during init ([#499](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/499)) ([34a97dd](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/34a97dd1de23ecd40c38ab923e3deabf9bafb364))
+
+
+### Documentation
+
+* **mcp:** add transport protocol info ([#501](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/501)) ([2b8b39b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/2b8b39bf8ead85b33a22eb6401287b12b68d65d9))
+
 ## [0.5.7](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.5.6...toolbox-core-v0.5.7) (2026-01-13)
 
 
diff --git a/packages/toolbox-core/src/toolbox_core/version.py b/packages/toolbox-core/src/toolbox_core/version.py
index d99d73a7..9e6eaa21 100644
--- a/packages/toolbox-core/src/toolbox_core/version.py
+++ b/packages/toolbox-core/src/toolbox_core/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.5.7"
+__version__ = "0.5.8"
diff --git a/packages/toolbox-langchain/CHANGELOG.md b/packages/toolbox-langchain/CHANGELOG.md
index 21ad3a61..064c85fd 100644
--- a/packages/toolbox-langchain/CHANGELOG.md
+++ b/packages/toolbox-langchain/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.5.8](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.7...toolbox-langchain-v0.5.8) (2026-01-16)
+
+
+### Documentation
+
+* **mcp:** add transport protocol info ([#501](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/501)) ([2b8b39b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/2b8b39bf8ead85b33a22eb6401287b12b68d65d9))
+
 ## [0.5.7](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.6...toolbox-langchain-v0.5.7) (2026-01-13)
 
 
diff --git a/packages/toolbox-langchain/pyproject.toml b/packages/toolbox-langchain/pyproject.toml
index 9b6382f8..73b07f64 100644
--- a/packages/toolbox-langchain/pyproject.toml
+++ b/packages/toolbox-langchain/pyproject.toml
@@ -9,7 +9,7 @@ authors = [
     {name = "Google LLC", email = "googleapis-packages@google.com"}
 ]
 dependencies = [
-    "toolbox-core==0.5.7",              # x-release-please-version
+    "toolbox-core==0.5.8",              # x-release-please-version
     "langchain-core>=0.2.23,<2.0.0",
     "PyYAML>=6.0.1,<7.0.0",
     "pydantic>=2.7.0,<3.0.0",
diff --git a/packages/toolbox-langchain/src/toolbox_langchain/version.py b/packages/toolbox-langchain/src/toolbox_langchain/version.py
index d99d73a7..9e6eaa21 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__ = "0.5.7"
+__version__ = "0.5.8"
diff --git a/packages/toolbox-llamaindex/CHANGELOG.md b/packages/toolbox-llamaindex/CHANGELOG.md
index 9accc010..498b8745 100644
--- a/packages/toolbox-llamaindex/CHANGELOG.md
+++ b/packages/toolbox-llamaindex/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.5.8](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.5.7...toolbox-llamaindex-v0.5.8) (2026-01-16)
+
+
+### Documentation
+
+* **mcp:** add transport protocol info ([#501](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/501)) ([2b8b39b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/2b8b39bf8ead85b33a22eb6401287b12b68d65d9))
+
 ## [0.5.7](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.5.6...toolbox-llamaindex-v0.5.7) (2026-01-13)
 
 
diff --git a/packages/toolbox-llamaindex/pyproject.toml b/packages/toolbox-llamaindex/pyproject.toml
index 8a754536..8e3da27a 100644
--- a/packages/toolbox-llamaindex/pyproject.toml
+++ b/packages/toolbox-llamaindex/pyproject.toml
@@ -9,7 +9,7 @@ authors = [
     {name = "Google LLC", email = "googleapis-packages@google.com"}
 ]
 dependencies = [
-    "toolbox-core==0.5.7",              # x-release-please-version
+    "toolbox-core==0.5.8",              # x-release-please-version
     "llama-index-core>=0.12.0,<1.0.0",
     "PyYAML>=6.0.1,<7.0.0",
     "pydantic>=2.8.0,<3.0.0",
diff --git a/packages/toolbox-llamaindex/src/toolbox_llamaindex/version.py b/packages/toolbox-llamaindex/src/toolbox_llamaindex/version.py
index d99d73a7..9e6eaa21 100644
--- a/packages/toolbox-llamaindex/src/toolbox_llamaindex/version.py
+++ b/packages/toolbox-llamaindex/src/toolbox_llamaindex/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.5.7"
+__version__ = "0.5.8"