diff --git a/python/CHANGELOG.md b/python/CHANGELOG.md
index c3291f7604..f56316ac72 100644
--- a/python/CHANGELOG.md
+++ b/python/CHANGELOG.md
@@ -7,6 +7,32 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.2.1] - 2026-04-28
+
+### Added
+- **agent-framework-foundry-hosting**: Add file data type support to hosted-agent Responses, refresh `foundry-hosted-agents` samples, and add response test coverage ([#5485](https://github.com/microsoft/agent-framework/pull/5485))
+- **samples**: Add `requirements.txt` and `.env.example` to the `a2a/` hosting sample for pip-based setup ([#5510](https://github.com/microsoft/agent-framework/pull/5510))
+
+### Changed
+- **dependencies**: Update `rich` requirement from `<15.0.0,>=13.7.1` to `>=13.7.1,<16.0.0` in `/python` ([#5227](https://github.com/microsoft/agent-framework/pull/5227))
+- **dependencies**: Bump `prek` from `0.3.8` to `0.3.9` in `/python` ([#5228](https://github.com/microsoft/agent-framework/pull/5228))
+- **dependencies**: Bump `python-multipart` from `0.0.22` to `0.0.26` in `/python` ([#5286](https://github.com/microsoft/agent-framework/pull/5286))
+- **dependencies**: Bump `pyasn1` from `0.6.2` to `0.6.3` in `/python` ([#4748](https://github.com/microsoft/agent-framework/pull/4748))
+- **dependencies**: Bump `pytest` from `9.0.2` to `9.0.3` in `/python/packages/ag-ui` ([#5461](https://github.com/microsoft/agent-framework/pull/5461))
+- **dependencies**: Bump `pytest` from `9.0.2` to `9.0.3` in `/python/packages/devui` ([#5492](https://github.com/microsoft/agent-framework/pull/5492))
+- **dependencies**: Bump `pytest` from `9.0.2` to `9.0.3` in `/python/packages/lab` ([#5470](https://github.com/microsoft/agent-framework/pull/5470))
+- **dependencies**: Bump `uv` from `0.11.3` to `0.11.6` in `/python/packages/lab` ([#5469](https://github.com/microsoft/agent-framework/pull/5469))
+- **dependencies**: Bump `vite` from `7.1.12` to `7.3.2` in `/python/packages/devui/frontend` ([#5127](https://github.com/microsoft/agent-framework/pull/5127))
+- **dependencies**: Bump `vite` from `7.1.12` to `7.3.2` in `/python/samples/05-end-to-end/chatkit-integration/frontend` ([#5126](https://github.com/microsoft/agent-framework/pull/5126))
+- **dependencies**: Bump `postcss` from `8.5.6` to `8.5.10` in `/python/packages/devui/frontend` ([#5484](https://github.com/microsoft/agent-framework/pull/5484))
+- **dependencies**: Bump `postcss` from `8.5.6` to `8.5.10` in `/python/samples/05-end-to-end/chatkit-integration/frontend` ([#5491](https://github.com/microsoft/agent-framework/pull/5491))
+- **dependencies**: Bump `postcss` from `8.5.6` to `8.5.12` in `/python/samples/05-end-to-end/ag_ui_workflow_handoff/frontend` ([#5527](https://github.com/microsoft/agent-framework/pull/5527))
+- **dependencies**: Bump `picomatch` from `4.0.3` to `4.0.4` in `/python/packages/devui/frontend` ([#4921](https://github.com/microsoft/agent-framework/pull/4921))
+- **dependencies**: Bump `picomatch` from `4.0.3` to `4.0.4` in `/python/samples/05-end-to-end/ag_ui_workflow_handoff/frontend` ([#4936](https://github.com/microsoft/agent-framework/pull/4936))
+
+### Fixed
+- **agent-framework-core**: Prevent `inner_exception` from being lost in `AgentFrameworkException` ([#5167](https://github.com/microsoft/agent-framework/pull/5167))
+
 ## [1.2.0] - 2026-04-24
 
 ### Added
@@ -977,7 +1003,8 @@ Release candidate for **agent-framework-core** and **agent-framework-azure-ai**
 
 For more information, see the [announcement blog post](https://devblogs.microsoft.com/foundry/introducing-microsoft-agent-framework-the-open-source-engine-for-agentic-ai-apps/).
 
-[Unreleased]: https://github.com/microsoft/agent-framework/compare/python-1.2.0...HEAD
+[Unreleased]: https://github.com/microsoft/agent-framework/compare/python-1.2.1...HEAD
+[1.2.1]: https://github.com/microsoft/agent-framework/compare/python-1.2.0...python-1.2.1
 [1.2.0]: https://github.com/microsoft/agent-framework/compare/python-1.1.1...python-1.2.0
 [1.1.1]: https://github.com/microsoft/agent-framework/compare/python-1.1.0...python-1.1.1
 [1.1.0]: https://github.com/microsoft/agent-framework/compare/python-1.0.1...python-1.1.0
diff --git a/python/packages/a2a/pyproject.toml b/python/packages/a2a/pyproject.toml
index 83d8ecf42f..d1245ca0b7 100644
--- a/python/packages/a2a/pyproject.toml
+++ b/python/packages/a2a/pyproject.toml
@@ -4,7 +4,7 @@ description = "A2A integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "a2a-sdk>=0.3.5,<0.3.24",
 ]
 
diff --git a/python/packages/ag-ui/pyproject.toml b/python/packages/ag-ui/pyproject.toml
index 5b6e40c95e..cb8425820d 100644
--- a/python/packages/ag-ui/pyproject.toml
+++ b/python/packages/ag-ui/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "agent-framework-ag-ui"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 description = "AG-UI protocol integration for Agent Framework"
 readme = "README.md"
 license-files = ["LICENSE"]
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "ag-ui-protocol>=0.1.16,<0.2",
     "fastapi>=0.115.0,<0.133.1",
     "uvicorn[standard]>=0.30.0,<0.42.0"
diff --git a/python/packages/anthropic/pyproject.toml b/python/packages/anthropic/pyproject.toml
index 9292ba7fc2..f3791de297 100644
--- a/python/packages/anthropic/pyproject.toml
+++ b/python/packages/anthropic/pyproject.toml
@@ -4,7 +4,7 @@ description = "Anthropic integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "anthropic>=0.80.0,<0.80.1",
 ]
 
diff --git a/python/packages/azure-ai-search/pyproject.toml b/python/packages/azure-ai-search/pyproject.toml
index 5f605943b6..da22162397 100644
--- a/python/packages/azure-ai-search/pyproject.toml
+++ b/python/packages/azure-ai-search/pyproject.toml
@@ -4,7 +4,7 @@ description = "Azure AI Search integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "azure-search-documents>=11.7.0b2,<11.7.0b3",
 ]
 
diff --git a/python/packages/azure-cosmos/pyproject.toml b/python/packages/azure-cosmos/pyproject.toml
index ddbe5bf06b..c830505eed 100644
--- a/python/packages/azure-cosmos/pyproject.toml
+++ b/python/packages/azure-cosmos/pyproject.toml
@@ -4,7 +4,7 @@ description = "Azure Cosmos DB history provider integration for Microsoft Agent
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "azure-cosmos>=4.3.0,<5",
 ]
 
diff --git a/python/packages/azurefunctions/pyproject.toml b/python/packages/azurefunctions/pyproject.toml
index 49f557a835..bd8bfef8c9 100644
--- a/python/packages/azurefunctions/pyproject.toml
+++ b/python/packages/azurefunctions/pyproject.toml
@@ -4,7 +4,7 @@ description = "Azure Functions integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "agent-framework-durabletask",
     "azure-functions>=1.24.0,<2",
     "azure-functions-durable>=1.3.1,<2",
diff --git a/python/packages/bedrock/pyproject.toml b/python/packages/bedrock/pyproject.toml
index c20c248708..0be6ace4f6 100644
--- a/python/packages/bedrock/pyproject.toml
+++ b/python/packages/bedrock/pyproject.toml
@@ -4,7 +4,7 @@ description = "Amazon Bedrock integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "boto3>=1.35.0,<2.0.0",
     "botocore>=1.35.0,<2.0.0",
 ]
diff --git a/python/packages/chatkit/pyproject.toml b/python/packages/chatkit/pyproject.toml
index 9a936ea8b6..be92383aff 100644
--- a/python/packages/chatkit/pyproject.toml
+++ b/python/packages/chatkit/pyproject.toml
@@ -4,7 +4,7 @@ description = "OpenAI ChatKit integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "openai-chatkit>=1.4.1,<2.0.0",
 ]
 
diff --git a/python/packages/claude/pyproject.toml b/python/packages/claude/pyproject.toml
index 35f9a7f3ff..6629926fc3 100644
--- a/python/packages/claude/pyproject.toml
+++ b/python/packages/claude/pyproject.toml
@@ -4,7 +4,7 @@ description = "Claude Agent SDK integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "claude-agent-sdk>=0.1.36,<0.1.49",
 ]
 
diff --git a/python/packages/copilotstudio/pyproject.toml b/python/packages/copilotstudio/pyproject.toml
index d2d1712f94..d735675a05 100644
--- a/python/packages/copilotstudio/pyproject.toml
+++ b/python/packages/copilotstudio/pyproject.toml
@@ -4,7 +4,7 @@ description = "Copilot Studio integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "microsoft-agents-copilotstudio-client>=0.3.1,<0.3.2",
 ]
 
diff --git a/python/packages/core/agent_framework/_telemetry.py b/python/packages/core/agent_framework/_telemetry.py
index ec3d55be4b..ab8576a305 100644
--- a/python/packages/core/agent_framework/_telemetry.py
+++ b/python/packages/core/agent_framework/_telemetry.py
@@ -79,9 +79,11 @@ def _detect_hosted_environment() -> None:
     except (ModuleNotFoundError, ValueError):
         return
     with contextlib.suppress(ImportError, AttributeError):
-        from azure.ai.agentserver.core import AgentConfig  # pyright: ignore[reportMissingImports]
+        from azure.ai.agentserver.core import (  # pyright: ignore[reportMissingImports]
+            AgentConfig,  # pyright: ignore[reportUnknownVariableType]
+        )
 
-        if AgentConfig.from_env().is_hosted:
+        if AgentConfig.from_env().is_hosted:  # pyright: ignore[reportUnknownMemberType]
             _add_user_agent_prefix(_HOSTED_USER_AGENT_PREFIX)
             _hosted_env_detected = True
 
diff --git a/python/packages/core/pyproject.toml b/python/packages/core/pyproject.toml
index 3dedc1ecba..ab2341b40b 100644
--- a/python/packages/core/pyproject.toml
+++ b/python/packages/core/pyproject.toml
@@ -4,7 +4,7 @@ description = "Microsoft Agent Framework for building AI Agents with Python. Thi
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.2.0"
+version = "1.2.1"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
diff --git a/python/packages/declarative/pyproject.toml b/python/packages/declarative/pyproject.toml
index 155b7e3edc..0c8f758a2a 100644
--- a/python/packages/declarative/pyproject.toml
+++ b/python/packages/declarative/pyproject.toml
@@ -4,7 +4,7 @@ description = "Declarative specification support for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "powerfx>=0.0.32,<0.0.35; python_version < '3.14'",
     "pyyaml>=6.0,<7.0",
 ]
diff --git a/python/packages/devui/pyproject.toml b/python/packages/devui/pyproject.toml
index 31fdf39234..7c7c0eb605 100644
--- a/python/packages/devui/pyproject.toml
+++ b/python/packages/devui/pyproject.toml
@@ -4,7 +4,7 @@ description = "Debug UI for Microsoft Agent Framework with OpenAI-compatible API
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://github.com/microsoft/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
  dependencies = [
-     "agent-framework-core>=1.2.0,<2",
+     "agent-framework-core>=1.2.1,<2",
      "openai>=1.99.0,<3",
      "opentelemetry-sdk>=1.39.0,<2",
      "fastapi>=0.115.0,<0.133.1",
diff --git a/python/packages/durabletask/pyproject.toml b/python/packages/durabletask/pyproject.toml
index 7d73511188..e1fd6a1ff9 100644
--- a/python/packages/durabletask/pyproject.toml
+++ b/python/packages/durabletask/pyproject.toml
@@ -4,7 +4,7 @@ description = "Durable Task integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "durabletask>=1.3.0,<2",
     "durabletask-azuremanaged>=1.3.0,<2",
     "python-dateutil>=2.8.0,<3",
diff --git a/python/packages/foundry/pyproject.toml b/python/packages/foundry/pyproject.toml
index 68d938241e..b75463cf29 100644
--- a/python/packages/foundry/pyproject.toml
+++ b/python/packages/foundry/pyproject.toml
@@ -4,7 +4,7 @@ description = "Microsoft Foundry integrations for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.2.0"
+version = "1.2.1"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "agent-framework-openai>=1.1.0,<2",
     "azure-ai-inference>=1.0.0b9,<1.0.0b10",
     "azure-ai-projects>=2.1.0,<3.0",
diff --git a/python/packages/foundry_hosting/pyproject.toml b/python/packages/foundry_hosting/pyproject.toml
index 9746cc6605..f4031f9df3 100644
--- a/python/packages/foundry_hosting/pyproject.toml
+++ b/python/packages/foundry_hosting/pyproject.toml
@@ -4,7 +4,7 @@ description = "Foundry Hosting integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "azure-ai-agentserver-core==2.0.0b3",
     "azure-ai-agentserver-responses==1.0.0b5",
     "azure-ai-agentserver-invocations==1.0.0b3",
diff --git a/python/packages/foundry_local/pyproject.toml b/python/packages/foundry_local/pyproject.toml
index d7c0416ffb..6cb6651376 100644
--- a/python/packages/foundry_local/pyproject.toml
+++ b/python/packages/foundry_local/pyproject.toml
@@ -4,7 +4,7 @@ description = "Foundry Local integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "agent-framework-openai>=1.1.0,<2",
     "foundry-local-sdk>=0.5.1,<0.5.2",
 ]
diff --git a/python/packages/gemini/pyproject.toml b/python/packages/gemini/pyproject.toml
index 384163fbee..4221fd5a44 100644
--- a/python/packages/gemini/pyproject.toml
+++ b/python/packages/gemini/pyproject.toml
@@ -4,7 +4,7 @@ description = "Google Gemini integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -24,8 +24,8 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2.0",
-    "google-genai>=1.0.0,<2.0.0",
+    "agent-framework-core>=1.2.1,<2.0",
+    "google-genai>=1.65.0,<2.0.0",
 ]
 
 [tool.uv]
diff --git a/python/packages/github_copilot/pyproject.toml b/python/packages/github_copilot/pyproject.toml
index eca6a3ae43..2ead67cd7a 100644
--- a/python/packages/github_copilot/pyproject.toml
+++ b/python/packages/github_copilot/pyproject.toml
@@ -4,7 +4,7 @@ description = "GitHub Copilot integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "github-copilot-sdk>=0.2.1,<=0.2.1; python_version >= '3.11'",
 ]
 
diff --git a/python/packages/hyperlight/pyproject.toml b/python/packages/hyperlight/pyproject.toml
index f9f5abd41f..36ee6e02d6 100644
--- a/python/packages/hyperlight/pyproject.toml
+++ b/python/packages/hyperlight/pyproject.toml
@@ -4,7 +4,7 @@ description = "Hyperlight CodeAct integrations for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "hyperlight-sandbox>=0.3.0,<0.4",
     "hyperlight-sandbox-backend-wasm>=0.3.0,<0.4 ; ((sys_platform == 'linux' and platform_machine == 'x86_64') or (sys_platform == 'win32' and platform_machine == 'AMD64')) and python_version < '3.14'",
     "hyperlight-sandbox-python-guest>=0.3.0,<0.4",
diff --git a/python/packages/lab/pyproject.toml b/python/packages/lab/pyproject.toml
index ca5f4837ad..91b4106cc7 100644
--- a/python/packages/lab/pyproject.toml
+++ b/python/packages/lab/pyproject.toml
@@ -4,7 +4,7 @@ description = "Experimental modules for Microsoft Agent Framework"
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -22,7 +22,7 @@ classifiers = [
   "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-  "agent-framework-core>=1.2.0,<2",
+  "agent-framework-core>=1.2.1,<2",
 ]
 
 [project.optional-dependencies]
diff --git a/python/packages/mem0/pyproject.toml b/python/packages/mem0/pyproject.toml
index 87042bdffb..3206701859 100644
--- a/python/packages/mem0/pyproject.toml
+++ b/python/packages/mem0/pyproject.toml
@@ -4,7 +4,7 @@ description = "Mem0 integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "mem0ai>=1.0.0,<2",
 ]
 
diff --git a/python/packages/ollama/pyproject.toml b/python/packages/ollama/pyproject.toml
index 3cd643e7ef..6ca077d38d 100644
--- a/python/packages/ollama/pyproject.toml
+++ b/python/packages/ollama/pyproject.toml
@@ -4,7 +4,7 @@ description = "Ollama integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://learn.microsoft.com/en-us/agent-framework/"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "ollama>=0.5.3,<0.5.4",
 ]
 
diff --git a/python/packages/openai/pyproject.toml b/python/packages/openai/pyproject.toml
index 26227d2cf2..ac05ec1b42 100644
--- a/python/packages/openai/pyproject.toml
+++ b/python/packages/openai/pyproject.toml
@@ -4,7 +4,7 @@ description = "OpenAI integrations for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.2.0"
+version = "1.2.1"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "openai>=1.99.0,<3",
 ]
 
diff --git a/python/packages/orchestrations/pyproject.toml b/python/packages/orchestrations/pyproject.toml
index c946440b80..f76aef2ea7 100644
--- a/python/packages/orchestrations/pyproject.toml
+++ b/python/packages/orchestrations/pyproject.toml
@@ -4,7 +4,7 @@ description = "Orchestration patterns for Microsoft Agent Framework. Includes Se
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
 ]
 
 [tool.uv]
diff --git a/python/packages/purview/pyproject.toml b/python/packages/purview/pyproject.toml
index a828479709..d504e3dad4 100644
--- a/python/packages/purview/pyproject.toml
+++ b/python/packages/purview/pyproject.toml
@@ -4,7 +4,7 @@ description = "Microsoft Purview (Graph dataSecurityAndGovernance) integration f
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://github.com/microsoft/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -24,7 +24,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "azure-core>=1.30.0,<2",
     "httpx>=0.27.0,<0.29",
 ]
diff --git a/python/packages/redis/pyproject.toml b/python/packages/redis/pyproject.toml
index 662cdfe13c..694d80a7bb 100644
--- a/python/packages/redis/pyproject.toml
+++ b/python/packages/redis/pyproject.toml
@@ -4,7 +4,7 @@ description = "Redis integration for Microsoft Agent Framework."
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core>=1.2.0,<2",
+    "agent-framework-core>=1.2.1,<2",
     "redis>=6.4.0,<7.2.1",
     "redisvl>=0.11.0,<0.16",
     "numpy>=2.2.6,<3"
diff --git a/python/pyproject.toml b/python/pyproject.toml
index 67853a9ec1..1a052d85fa 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -4,7 +4,7 @@ description = "Microsoft Agent Framework for building AI Agents with Python. Thi
 authors = [{ name = "Microsoft", email = "af-support@microsoft.com"}]
 readme = "README.md"
 requires-python = ">=3.10"
-version = "1.2.0"
+version = "1.2.1"
 license-files = ["LICENSE"]
 urls.homepage = "https://aka.ms/agent-framework"
 urls.source = "https://github.com/microsoft/agent-framework/tree/main/python"
@@ -23,7 +23,7 @@ classifiers = [
   "Typing :: Typed",
 ]
 dependencies = [
-    "agent-framework-core[all]==1.2.0",
+    "agent-framework-core[all]==1.2.1",
 ]
 
 [dependency-groups]
diff --git a/python/uv.lock b/python/uv.lock
index bb422b4478..3ab0678423 100644
--- a/python/uv.lock
+++ b/python/uv.lock
@@ -96,7 +96,7 @@ wheels = [
 
 [[package]]
 name = "agent-framework"
-version = "1.2.0"
+version = "1.2.1"
 source = { virtual = "." }
 dependencies = [
     { name = "agent-framework-core", extra = ["all"], marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -151,7 +151,7 @@ dev = [
 
 [[package]]
 name = "agent-framework-a2a"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/a2a" }
 dependencies = [
     { name = "a2a-sdk", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -166,7 +166,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-ag-ui"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/ag-ui" }
 dependencies = [
     { name = "ag-ui-protocol", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -194,7 +194,7 @@ provides-extras = ["dev"]
 
 [[package]]
 name = "agent-framework-anthropic"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/anthropic" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -209,7 +209,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-azure-ai-search"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/azure-ai-search" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -224,7 +224,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-azure-cosmos"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/azure-cosmos" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -239,7 +239,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-azurefunctions"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/azurefunctions" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -261,7 +261,7 @@ dev = []
 
 [[package]]
 name = "agent-framework-bedrock"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/bedrock" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -278,7 +278,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-chatkit"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/chatkit" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -293,7 +293,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-claude"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/claude" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -308,7 +308,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-copilotstudio"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/copilotstudio" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -323,7 +323,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-core"
-version = "1.2.0"
+version = "1.2.1"
 source = { editable = "packages/core" }
 dependencies = [
     { name = "opentelemetry-api", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -395,7 +395,7 @@ provides-extras = ["all"]
 
 [[package]]
 name = "agent-framework-declarative"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/declarative" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -420,7 +420,7 @@ dev = [{ name = "types-pyyaml", specifier = "==6.0.12.20250915" }]
 
 [[package]]
 name = "agent-framework-devui"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/devui" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -458,7 +458,7 @@ provides-extras = ["dev", "all"]
 
 [[package]]
 name = "agent-framework-durabletask"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/durabletask" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -485,7 +485,7 @@ dev = [{ name = "types-python-dateutil", specifier = "==2.9.0.20260402" }]
 
 [[package]]
 name = "agent-framework-foundry"
-version = "1.2.0"
+version = "1.2.1"
 source = { editable = "packages/foundry" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -504,7 +504,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-foundry-hosting"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 source = { editable = "packages/foundry_hosting" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -523,7 +523,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-foundry-local"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/foundry_local" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -540,7 +540,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-gemini"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 source = { editable = "packages/gemini" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -550,12 +550,12 @@ dependencies = [
 [package.metadata]
 requires-dist = [
     { name = "agent-framework-core", editable = "packages/core" },
-    { name = "google-genai", specifier = ">=1.0.0,<2.0.0" },
+    { name = "google-genai", specifier = ">=1.65.0,<2.0.0" },
 ]
 
 [[package]]
 name = "agent-framework-github-copilot"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/github_copilot" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -570,7 +570,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-hyperlight"
-version = "1.0.0a260424"
+version = "1.0.0a260428"
 source = { editable = "packages/hyperlight" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -589,7 +589,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-lab"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/lab" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -670,7 +670,7 @@ dev = [
 
 [[package]]
 name = "agent-framework-mem0"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/mem0" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -685,7 +685,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-ollama"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/ollama" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -700,7 +700,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-openai"
-version = "1.2.0"
+version = "1.2.1"
 source = { editable = "packages/openai" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -715,7 +715,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-orchestrations"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/orchestrations" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -726,7 +726,7 @@ requires-dist = [{ name = "agent-framework-core", editable = "packages/core" }]
 
 [[package]]
 name = "agent-framework-purview"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/purview" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },
@@ -743,7 +743,7 @@ requires-dist = [
 
 [[package]]
 name = "agent-framework-redis"
-version = "1.0.0b260424"
+version = "1.0.0b260428"
 source = { editable = "packages/redis" }
 dependencies = [
     { name = "agent-framework-core", marker = "sys_platform == 'darwin' or sys_platform == 'linux' or sys_platform == 'win32'" },