diff --git a/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/_patch.py b/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/_patch.py
index 59473e6e901b..438d337b9f88 100644
--- a/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/_patch.py
+++ b/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/_patch.py
@@ -66,8 +66,8 @@ class ConfidentialLedgerClient(GeneratedClient):
         file does not exist yet, the Confidential Ledger's TLS certificate will be fetched and saved
         to this file.
     :paramtype ledger_certificate_path: Union[bytes, str, os.PathLike]
-    :keyword api_version: Api Version. Default value is "2022-05-13". Note that overriding this
-     default value may result in unsupported behavior.
+    :keyword api_version: API version for Confidential Ledger operations. Default value is "2024-12-09-preview".
+        This aligns with the latest preview specification. Overriding may lead to unsupported behavior.
     :paramtype api_version: str
     """
 
@@ -79,6 +79,10 @@ def __init__(
         ledger_certificate_path: Union[bytes, str, os.PathLike],
         **kwargs: Any,
     ) -> None:
+        # Align default to latest preview used by generated configuration
+        api_version = kwargs.pop("api_version", "2024-12-09-preview")
+        kwargs["api_version"] = api_version
+        
         # Remove some kwargs first so that there aren't unexpected kwargs passed to
         # get_ledger_identity.
 
diff --git a/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/aio/_patch.py b/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/aio/_patch.py
index 0f494322eb1d..2606b3cc67ac 100644
--- a/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/aio/_patch.py
+++ b/sdk/confidentialledger/azure-confidentialledger/azure/confidentialledger/aio/_patch.py
@@ -52,8 +52,8 @@ class ConfidentialLedgerClient(GeneratedClient):
         file does not exist yet, the Confidential Ledger's TLS certificate will be fetched and saved
         to this file.
     :paramtype ledger_certificate_path: Union[bytes, str, os.PathLike]
-    :keyword api_version: Api Version. Default value is "2022-05-13". Note that overriding this
-     default value may result in unsupported behavior.
+    :keyword api_version: API version for Confidential Ledger operations. Default value is "2024-12-09-preview".
+        This aligns with the latest preview specification. Overriding may lead to unsupported behavior.
     :paramtype api_version: str
     """
 
@@ -65,6 +65,10 @@ def __init__(
         ledger_certificate_path: Union[bytes, str, os.PathLike],
         **kwargs: Any,
     ) -> None:
+        # Align default to latest preview used by generated configuration
+        api_version = kwargs.pop("api_version", "2024-12-09-preview")
+        kwargs["api_version"] = api_version
+        
         # Remove some kwargs first so that there aren't unexpected kwargs passed to
         # get_ledger_identity.
 
diff --git a/sdk/confidentialledger/azure-confidentialledger/tests/test_api_version.py b/sdk/confidentialledger/azure-confidentialledger/tests/test_api_version.py
new file mode 100644
index 000000000000..93610ce40614
--- /dev/null
+++ b/sdk/confidentialledger/azure-confidentialledger/tests/test_api_version.py
@@ -0,0 +1,96 @@
+# pylint: disable=line-too-long,useless-suppression
+"""Tests for API version defaults in Confidential Ledger clients."""
+import os
+import re
+
+
+class TestDefaultApiVersion:
+    """Test that the default API version is correctly set in source code."""
+
+    def test_data_plane_patch_has_correct_default(self):
+        """Verify data-plane _patch.py has 2024-12-09-preview as default."""
+        patch_file = os.path.join(
+            os.path.dirname(os.path.dirname(__file__)),
+            "azure", "confidentialledger", "_patch.py"
+        )
+        
+        with open(patch_file, 'r', encoding='utf-8') as f:
+            content = f.read()
+        
+        # Check docstring mentions the correct version
+        assert '"2024-12-09-preview"' in content, \
+            "Docstring should mention 2024-12-09-preview"
+        
+        # Check code sets the correct default
+        assert 'api_version = kwargs.pop("api_version", "2024-12-09-preview")' in content, \
+            "Code should default to 2024-12-09-preview"
+
+    def test_data_plane_async_patch_has_correct_default(self):
+        """Verify async data-plane aio/_patch.py has 2024-12-09-preview as default."""
+        patch_file = os.path.join(
+            os.path.dirname(os.path.dirname(__file__)),
+            "azure", "confidentialledger", "aio", "_patch.py"
+        )
+        
+        with open(patch_file, 'r', encoding='utf-8') as f:
+            content = f.read()
+        
+        # Check docstring mentions the correct version
+        assert '"2024-12-09-preview"' in content, \
+            "Docstring should mention 2024-12-09-preview"
+        
+        # Check code sets the correct default
+        assert 'api_version = kwargs.pop("api_version", "2024-12-09-preview")' in content, \
+            "Code should default to 2024-12-09-preview"
+
+    def test_mgmt_client_docstring_mentions_version(self):
+        """Verify management client docstring mentions current default version."""
+        mgmt_file = os.path.join(
+            os.path.dirname(os.path.dirname(os.path.dirname(__file__))),
+            "azure-mgmt-confidentialledger", "azure", "mgmt", "confidentialledger",
+            "_confidential_ledger.py"
+        )
+        
+        with open(mgmt_file, 'r', encoding='utf-8') as f:
+            content = f.read()
+        
+        # Check docstring mentions the correct version
+        assert "2024-09-19-preview" in content, \
+            "Docstring should mention 2024-09-19-preview as default"
+        
+        # Check it mentions the newer version
+        assert "2025-06-10-preview" in content, \
+            "Docstring should mention 2025-06-10-preview as available"
+
+    def test_mgmt_client_async_docstring_mentions_version(self):
+        """Verify async management client docstring mentions current default version."""
+        mgmt_file = os.path.join(
+            os.path.dirname(os.path.dirname(os.path.dirname(__file__))),
+            "azure-mgmt-confidentialledger", "azure", "mgmt", "confidentialledger",
+            "aio", "_confidential_ledger.py"
+        )
+        
+        with open(mgmt_file, 'r', encoding='utf-8') as f:
+            content = f.read()
+        
+        # Check docstring mentions the correct version
+        assert "2024-09-19-preview" in content, \
+            "Docstring should mention 2024-09-19-preview as default"
+        
+        # Check it mentions the newer version
+        assert "2025-06-10-preview" in content, \
+            "Docstring should mention 2025-06-10-preview as available"
+
+    def test_generated_config_uses_latest_preview(self):
+        """Verify generated configuration file uses the latest preview version."""
+        config_file = os.path.join(
+            os.path.dirname(os.path.dirname(__file__)),
+            "azure", "confidentialledger", "_configuration.py"
+        )
+        
+        with open(config_file, 'r', encoding='utf-8') as f:
+            content = f.read()
+        
+        # Check that generated config uses 2024-12-09-preview
+        assert '"2024-12-09-preview"' in content, \
+            "Generated configuration should use 2024-12-09-preview"
diff --git a/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/_confidential_ledger.py b/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/_confidential_ledger.py
index ad426127888e..d3062ed34db0 100644
--- a/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/_confidential_ledger.py
+++ b/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/_confidential_ledger.py
@@ -27,7 +27,10 @@
 
 
 class ConfidentialLedger(ConfidentialLedgerOperationsMixin):
-    """Microsoft Azure Confidential Compute Ledger Control Plane REST API version 2020-12-01-preview.
+    """Microsoft Azure Confidential Compute Ledger Control Plane.
+
+    Default REST API version: 2024-09-19-preview.
+    A newer preview (2025-06-10-preview) is available in published TypeSpec; specify api_version to opt-in.
 
     :ivar operations: Operations operations
     :vartype operations: azure.mgmt.confidentialledger.operations.Operations
diff --git a/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/aio/_confidential_ledger.py b/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/aio/_confidential_ledger.py
index 09cfeffbb285..05cb7e5b5d68 100644
--- a/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/aio/_confidential_ledger.py
+++ b/sdk/confidentialledger/azure-mgmt-confidentialledger/azure/mgmt/confidentialledger/aio/_confidential_ledger.py
@@ -27,7 +27,10 @@
 
 
 class ConfidentialLedger(ConfidentialLedgerOperationsMixin):
-    """Microsoft Azure Confidential Compute Ledger Control Plane REST API version 2020-12-01-preview.
+    """Microsoft Azure Confidential Compute Ledger Control Plane.
+
+    Default REST API version: 2024-09-19-preview.
+    Newer preview (2025-06-10-preview) available; set api_version explicitly to use it.
 
     :ivar operations: Operations operations
     :vartype operations: azure.mgmt.confidentialledger.aio.operations.Operations