diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b40476db..c32c40dc 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{"packages/toolbox-langchain":"0.5.0","packages/toolbox-core":"0.5.0","packages/toolbox-llamaindex":"0.5.0"}
+{"packages/toolbox-langchain":"0.5.1","packages/toolbox-core":"0.5.1","packages/toolbox-llamaindex":"0.5.1"}
diff --git a/packages/toolbox-core/CHANGELOG.md b/packages/toolbox-core/CHANGELOG.md
index 09c34b43..3f20ad24 100644
--- a/packages/toolbox-core/CHANGELOG.md
+++ b/packages/toolbox-core/CHANGELOG.md
@@ -1,5 +1,24 @@
 # Changelog
 
+## [0.5.1](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.5.0...toolbox-core-v0.5.1) (2025-09-17)
+
+
+### Bug Fixes
+
+* **toolbox-core:** Use typing.Annotated for reliable parameter descriptions instead of docstrings ([#371](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/371)) ([eb76680](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/eb76680d24c344241f3c15293cd12904bbf91b0d))
+
+
+### Documentation
+
+* Update langgraph sample in toolbox-core ([#366](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/366)) ([fe35082](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/fe35082104d8039986eccbdab937f5f3e8b2042b))
+
+
+### Miscellaneous Chores
+
+* Remove redundant test for test_add_auth_token_getter_unused_token ([#347](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/347)) ([dccaf1b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/dccaf1bd70e4e788fd80a9ef952aede4549b2fc7))
+* Remove duplicate header check during initialization ([#357](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/357)) ([888170b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/888170b3c34744089fb3b6f2b6f613c4cd718a89))
+
+
 ## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.4.0...toolbox-core-v0.5.0) (2025-08-19)
 
 
diff --git a/packages/toolbox-core/src/toolbox_core/version.py b/packages/toolbox-core/src/toolbox_core/version.py
index 94658229..48a840ac 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__ = "0.5.0"
+__version__ = "0.5.1"
diff --git a/packages/toolbox-langchain/CHANGELOG.md b/packages/toolbox-langchain/CHANGELOG.md
index 6f966cd8..bce1fd99 100644
--- a/packages/toolbox-langchain/CHANGELOG.md
+++ b/packages/toolbox-langchain/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.5.1](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.5.0...toolbox-langchain-v0.5.1) (2025-09-17)
+
+
+### Miscellaneous Chores
+
+* **deps:** update dependency langchain-core to v0.3.75 ([#346](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/346)) ([06d41d4](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/06d41d48caa01e63bade8a583514dd15b6dfa493))
+* **deps:** update dependency langchain-core to v0.3.76 ([#362](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/362)) ([580f321](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/580f3217428ee07713430ab3af2b2067c1debed5))
+* **deps:** update dependency pytest-cov to v7 ([#361](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/361)) ([b473a2b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/b473a2bb4538c27e80110a53f9bd62137767d331))
+* **deps:** update python-nonmajor ([#351](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/351)) ([db16cc7](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/db16cc766654c312e0065e6581d3611d2959bb1a))
+* **deps:** update python-nonmajor ([#354](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/354)) ([df8d695](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/df8d695622d5ad0b6c609c78d830680ebc5fcf10))
+* **deps:** update python-nonmajor ([#367](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/367)) ([d9f9c02](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/d9f9c0245c70951435bf2e0d364c8d1e439bc6fb))
+* **deps:** update python-nonmajor ([#368](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/368)) ([c3e8ff6](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/c3e8ff6fa305a2b0564c3a22c6844da13e50cd06))
+
 ## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.4.0...toolbox-langchain-v0.5.0) (2025-08-19)
 
 
diff --git a/packages/toolbox-langchain/pyproject.toml b/packages/toolbox-langchain/pyproject.toml
index ec5b3591..40a79155 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==0.5.0",              # x-release-please-version
+    "toolbox-core==0.5.1",              # x-release-please-version
     "langchain-core>=0.2.23,<1.0.0",
     "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 94658229..48a840ac 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__ = "0.5.0"
+__version__ = "0.5.1"
diff --git a/packages/toolbox-llamaindex/CHANGELOG.md b/packages/toolbox-llamaindex/CHANGELOG.md
index 84790cb1..459ccd0b 100644
--- a/packages/toolbox-llamaindex/CHANGELOG.md
+++ b/packages/toolbox-llamaindex/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.5.1](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.5.0...toolbox-llamaindex-v0.5.1) (2025-09-17)
+
+
+### Miscellaneous Chores
+
+* **deps:** update dependency llama-index to v0.13.3 ([#342](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/342)) ([2b3f4c5](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/2b3f4c5b2e759974e905ea549e8a6209c47f3ba4))
+* **deps:** update dependency llama-index to v0.14.0 ([#360](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/360)) ([e861536](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/e861536622eb431e4785aa5373e8d6e19a1ae611))
+* **deps:** update dependency pytest-cov to v7 ([#361](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/361)) ([b473a2b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/b473a2bb4538c27e80110a53f9bd62137767d331))
+* **deps:** update python-nonmajor ([#351](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/351)) ([db16cc7](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/db16cc766654c312e0065e6581d3611d2959bb1a))
+* **deps:** update python-nonmajor ([#354](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/354)) ([df8d695](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/df8d695622d5ad0b6c609c78d830680ebc5fcf10))
+* **deps:** update python-nonmajor ([#367](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/367)) ([d9f9c02](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/d9f9c0245c70951435bf2e0d364c8d1e439bc6fb))
+* **deps:** update python-nonmajor ([#368](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/368)) ([c3e8ff6](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/c3e8ff6fa305a2b0564c3a22c6844da13e50cd06))
+
 ## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.4.0...toolbox-llamaindex-v0.5.0) (2025-08-19)
 
 
diff --git a/packages/toolbox-llamaindex/pyproject.toml b/packages/toolbox-llamaindex/pyproject.toml
index 6d5e5026..9ef8ccd1 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==0.5.0",              # x-release-please-version
+    "toolbox-core==0.5.1",              # x-release-please-version
     "llama-index>=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 94658229..48a840ac 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__ = "0.5.0"
+__version__ = "0.5.1"