diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 455f481c..26046f64 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -115,6 +115,8 @@ jobs:
     - name: Build package
       run: |
         AGENT365_PYTHON_SDK_PACKAGE_VERSION=${{ needs.version-number.outputs.PACKAGE_VERSION }} uv build --all-packages --wheel
+      env:
+        AGENT365_PYTHON_SDK_PACKAGE_VERSION: ${{ needs.version-number.outputs.PACKAGE_VERSION }}
 
     - name: Run unit tests
       run: |
diff --git a/libraries/microsoft-agents-a365-notifications/setup.py b/libraries/microsoft-agents-a365-notifications/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-notifications/setup.py
+++ b/libraries/microsoft-agents-a365-notifications/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-observability-core/setup.py b/libraries/microsoft-agents-a365-observability-core/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-observability-core/setup.py
+++ b/libraries/microsoft-agents-a365-observability-core/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-observability-extensions-langchain/setup.py b/libraries/microsoft-agents-a365-observability-extensions-langchain/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-observability-extensions-langchain/setup.py
+++ b/libraries/microsoft-agents-a365-observability-extensions-langchain/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-observability-extensions-openai/setup.py b/libraries/microsoft-agents-a365-observability-extensions-openai/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-observability-extensions-openai/setup.py
+++ b/libraries/microsoft-agents-a365-observability-extensions-openai/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-observability-extensions-semantickernel/setup.py b/libraries/microsoft-agents-a365-observability-extensions-semantickernel/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-observability-extensions-semantickernel/setup.py
+++ b/libraries/microsoft-agents-a365-observability-extensions-semantickernel/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-runtime/microsoft_agents_a365/runtime/version_utils.py b/libraries/microsoft-agents-a365-runtime/microsoft_agents_a365/runtime/version_utils.py
index 59ceaa7c..7a471b38 100644
--- a/libraries/microsoft-agents-a365-runtime/microsoft_agents_a365/runtime/version_utils.py
+++ b/libraries/microsoft-agents-a365-runtime/microsoft_agents_a365/runtime/version_utils.py
@@ -1,27 +1,34 @@
-# Copyright (c) Microsoft. All rights reserved.
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+"""
+Version utilities for Agent365 SDK packages.
+
+This module is deprecated. Versioning is now handled automatically by
+setuptools-git-versioning. See versioning/TARGET-VERSION and
+HOW_TO_SET_A_VERSION.md for details.
+"""
 
 from __future__ import annotations
 
 import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
 
 
 def build_version():
     """
-    Build version string for Agent365 SDK packages.
+    DEPRECATED: This function is no longer used.
 
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
+    Version is now automatically calculated by setuptools-git-versioning
+    based on Git history and tags. See HOW_TO_SET_A_VERSION.md for details.
 
     Returns:
-        str: Version string in format YYYY.M.D+preview.HHMMSS or environment override
+        str: Version from AGENT365_PYTHON_SDK_PACKAGE_VERSION environment variable or "0.0.0"
     """
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
+    import warnings
 
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
+    warnings.warn(
+        "build_version() is deprecated. Version is now managed by setuptools-git-versioning.",
+        DeprecationWarning,
+        stacklevel=2,
     )
+    return os.environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
diff --git a/libraries/microsoft-agents-a365-runtime/setup.py b/libraries/microsoft-agents-a365-runtime/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-runtime/setup.py
+++ b/libraries/microsoft-agents-a365-runtime/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-tooling-extensions-agentframework/setup.py b/libraries/microsoft-agents-a365-tooling-extensions-agentframework/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-tooling-extensions-agentframework/setup.py
+++ b/libraries/microsoft-agents-a365-tooling-extensions-agentframework/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-tooling-extensions-azureaifoundry/setup.py b/libraries/microsoft-agents-a365-tooling-extensions-azureaifoundry/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-tooling-extensions-azureaifoundry/setup.py
+++ b/libraries/microsoft-agents-a365-tooling-extensions-azureaifoundry/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-tooling-extensions-openai/setup.py b/libraries/microsoft-agents-a365-tooling-extensions-openai/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-tooling-extensions-openai/setup.py
+++ b/libraries/microsoft-agents-a365-tooling-extensions-openai/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-tooling-extensions-semantickernel/setup.py b/libraries/microsoft-agents-a365-tooling-extensions-semantickernel/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-tooling-extensions-semantickernel/setup.py
+++ b/libraries/microsoft-agents-a365-tooling-extensions-semantickernel/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )
diff --git a/libraries/microsoft-agents-a365-tooling/setup.py b/libraries/microsoft-agents-a365-tooling/setup.py
index 885895ea..a04ba9a5 100644
--- a/libraries/microsoft-agents-a365-tooling/setup.py
+++ b/libraries/microsoft-agents-a365-tooling/setup.py
@@ -1,30 +1,13 @@
-# Copyright (c) Microsoft. All rights reserved.
-
-import os
-from datetime import datetime
-from zoneinfo import ZoneInfo
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
+from os import environ
 from setuptools import setup
 
-
-def build_version():
-    """
-    Example: 2025.10.3+preview.65532  (PEP 440 compliant; avoids hyphens)
-    Uses UTC.
-    """
-
-    if defined_version := os.getenv("A365_SDK_VERSION"):
-        return defined_version  # For CI/CD to set a specific version.
-
-    today = datetime.now(ZoneInfo("UTC"))
-
-    return (
-        f"{today.year}.{today.month}.{today.day}+preview.{today.hour}{today.minute}{today.second}"
-    )
-
-
-VERSION = build_version()
+# Get version from environment variable set by CI/CD
+# This will be set by setuptools-git-versioning in the CI pipeline
+package_version = environ.get("AGENT365_PYTHON_SDK_PACKAGE_VERSION", "0.0.0")
 
 setup(
-    version=VERSION,
+    version=package_version,
 )