diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b9721476..b40476db 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{"packages/toolbox-langchain":"0.4.0","packages/toolbox-core":"0.4.0","packages/toolbox-llamaindex":"0.4.0"}
+{"packages/toolbox-langchain":"0.5.0","packages/toolbox-core":"0.5.0","packages/toolbox-llamaindex":"0.5.0"}
diff --git a/packages/toolbox-core/CHANGELOG.md b/packages/toolbox-core/CHANGELOG.md
index 98c2a850..f443dd6a 100644
--- a/packages/toolbox-core/CHANGELOG.md
+++ b/packages/toolbox-core/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.4.0...toolbox-core-v0.5.0) (2025-08-11)
+
+
+### ⚠ BREAKING CHANGES
+
+* **core:** Use ValueError for missing 'items' in array parameters ([#325](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/325))
+
+### Bug Fixes
+
+* **core:** Use ValueError for missing 'items' in array parameters ([#325](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/325)) ([b43409e](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/b43409ed220bbe89ab2521286239af203c067897))
+* **deps:** update dependency mypy to v1.17.1 ([#322](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/322)) ([0c0d94e](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/0c0d94e56dc59c48dd5d2bef14bc3b2bf82af132))
+
+
+### Miscellaneous Chores
+
+* **deps:** update dependency aiohttp to v3.12.15 ([#320](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/320)) ([f4159d8](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/f4159d863fdc436dda3cd17fa74ef18de13fa19e))
+
+
+### Documentation
+
+* Enhance DEVELOPER.md for improved contribution guidelines ([#316](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/316)) ([1d2be43](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/1d2be4396d50d1119381149c7b1c4d1a778a0349))
+
 ## [0.4.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-core-v0.3.0...toolbox-core-v0.4.0) (2025-07-17)
 
 
diff --git a/packages/toolbox-core/src/toolbox_core/version.py b/packages/toolbox-core/src/toolbox_core/version.py
index 28333f00..94658229 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__ = "0.4.0"
+__version__ = "0.5.0"
diff --git a/packages/toolbox-langchain/CHANGELOG.md b/packages/toolbox-langchain/CHANGELOG.md
index a54dd09c..9a42fa1e 100644
--- a/packages/toolbox-langchain/CHANGELOG.md
+++ b/packages/toolbox-langchain/CHANGELOG.md
@@ -1,5 +1,25 @@
 # Changelog
 
+## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.4.0...toolbox-langchain-v0.5.0) (2025-08-11)
+
+
+### Bug Fixes
+
+* **deps:** update dependency mypy to v1.17.1 ([#322](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/322)) ([0c0d94e](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/0c0d94e56dc59c48dd5d2bef14bc3b2bf82af132))
+
+
+### Miscellaneous Chores
+
+* **deps:** update dependency aiohttp to v3.12.15 ([#320](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/320)) ([f4159d8](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/f4159d863fdc436dda3cd17fa74ef18de13fa19e))
+* **deps:** update dependency langchain-core to v0.3.70 ([#318](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/318)) ([908b92c](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/908b92c3e838a304cddd7411395958af6ce69fee))
+* **deps:** update python-nonmajor ([#319](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/319)) ([43c671b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/43c671bc1508ceb9892c6a03b1cff63828fe6bc1))
+* **deps:** update python-nonmajor ([#323](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/323)) ([d304d86](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/d304d86b9d2fcec3926b9d17a942476c0946111d))
+
+
+### Documentation
+
+* Enhance DEVELOPER.md for improved contribution guidelines ([#316](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/316)) ([1d2be43](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/1d2be4396d50d1119381149c7b1c4d1a778a0349))
+
 ## [0.4.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-langchain-v0.3.0...toolbox-langchain-v0.4.0) (2025-07-17)
 
 
diff --git a/packages/toolbox-langchain/pyproject.toml b/packages/toolbox-langchain/pyproject.toml
index 5f17d451..8a2686b8 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==0.4.0",              # x-release-please-version
+    "toolbox-core==0.5.0",              # 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 28333f00..94658229 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__ = "0.4.0"
+__version__ = "0.5.0"
diff --git a/packages/toolbox-llamaindex/CHANGELOG.md b/packages/toolbox-llamaindex/CHANGELOG.md
index 20d16fbe..9823a2a8 100644
--- a/packages/toolbox-llamaindex/CHANGELOG.md
+++ b/packages/toolbox-llamaindex/CHANGELOG.md
@@ -1,5 +1,26 @@
 # Changelog
 
+## [0.5.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.4.0...toolbox-llamaindex-v0.5.0) (2025-08-11)
+
+
+### Bug Fixes
+
+* **deps:** update dependency mypy to v1.17.1 ([#322](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/322)) ([0c0d94e](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/0c0d94e56dc59c48dd5d2bef14bc3b2bf82af132))
+
+
+### Miscellaneous Chores
+
+* **deps:** update dependency aiohttp to v3.12.15 ([#320](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/320)) ([f4159d8](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/f4159d863fdc436dda3cd17fa74ef18de13fa19e))
+* **deps:** update dependency llama-index to v0.12.50 ([#315](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/315)) ([7073f8d](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/7073f8d5309a6ffb5eb0d4079033af175ca4f773))
+* **deps:** update dependency llama-index to v0.13.1 ([#334](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/334)) ([1cce380](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/1cce38051b59008f2e1d75fd63b3f8ee4e43bdd5))
+* **deps:** update python-nonmajor ([#319](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/319)) ([43c671b](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/43c671bc1508ceb9892c6a03b1cff63828fe6bc1))
+* **deps:** update python-nonmajor ([#323](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/323)) ([d304d86](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/d304d86b9d2fcec3926b9d17a942476c0946111d))
+
+
+### Documentation
+
+* Enhance DEVELOPER.md for improved contribution guidelines ([#316](https://github.com/googleapis/mcp-toolbox-sdk-python/issues/316)) ([1d2be43](https://github.com/googleapis/mcp-toolbox-sdk-python/commit/1d2be4396d50d1119381149c7b1c4d1a778a0349))
+
 ## [0.4.0](https://github.com/googleapis/mcp-toolbox-sdk-python/compare/toolbox-llamaindex-v0.3.0...toolbox-llamaindex-v0.4.0) (2025-07-17)
 
 
diff --git a/packages/toolbox-llamaindex/pyproject.toml b/packages/toolbox-llamaindex/pyproject.toml
index c46a8d04..35ce91c3 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==0.4.0",              # x-release-please-version
+    "toolbox-core==0.5.0",              # 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 28333f00..94658229 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__ = "0.4.0"
+__version__ = "0.5.0"