diff --git a/src/aimanager/HISTORY.rst b/src/aimanager/HISTORY.rst
index 857a6232f74..7bdd25b8bc4 100644
--- a/src/aimanager/HISTORY.rst
+++ b/src/aimanager/HISTORY.rst
@@ -3,7 +3,11 @@
 Release History
 ===============
 
-1.2.1b1
+1.4.0
++++++++
+* Mark ``az aimanager`` command groups as preview.
+
+1.3.0
 +++++++
 * Add ``az aimanager model`` commands (``show``, ``list`` and ``calculate-cost``) to browse the
   regional AI model catalog and estimate the cost of deploying a model.
diff --git a/src/aimanager/azext_aimanager/commands.py b/src/aimanager/azext_aimanager/commands.py
index 3b582320cf9..896a59b5a31 100644
--- a/src/aimanager/azext_aimanager/commands.py
+++ b/src/aimanager/azext_aimanager/commands.py
@@ -45,7 +45,7 @@ def load_command_table(self, _):
     )
 
     # aimanager command group
-    with self.command_group("aimanager", ai_managers_sdk, client_factory=cf_ai_managers) as g:
+    with self.command_group("aimanager", ai_managers_sdk, client_factory=cf_ai_managers, is_preview=True) as g:
         g.custom_command("create", "create_aimanager", supports_no_wait=True)
         g.custom_command("update", "update_aimanager", supports_no_wait=True)
         g.custom_show_command("show", "show_aimanager")
@@ -55,7 +55,7 @@ def load_command_table(self, _):
         g.wait_command("wait")
 
     # aimanager namespace command group
-    with self.command_group("aimanager namespace", ai_manager_namespaces_sdk, client_factory=cf_ai_manager_namespaces) as g:
+    with self.command_group("aimanager namespace", ai_manager_namespaces_sdk, client_factory=cf_ai_manager_namespaces, is_preview=True) as g:
         g.custom_command("add", "add_aimanager_namespace", supports_no_wait=True)
         g.custom_command("update", "update_aimanager_namespace", supports_no_wait=True)
         g.custom_show_command("show", "show_aimanager_namespace")
@@ -83,7 +83,7 @@ def load_command_table(self, _):
 
     # aimanager namespace modeldeployment command group
     with self.command_group("aimanager namespace modeldeployment", model_deployments_sdk,
-                            client_factory=cf_model_deployments) as g:
+                            client_factory=cf_model_deployments, is_preview=True) as g:
         g.custom_command("add", "add_modeldeployment", supports_no_wait=True)
         g.custom_command("update", "update_modeldeployment", supports_no_wait=True)
         g.custom_show_command("show", "show_modeldeployment")
diff --git a/src/aimanager/setup.py b/src/aimanager/setup.py
index 11bac3528e6..6d4b3d56ec3 100644
--- a/src/aimanager/setup.py
+++ b/src/aimanager/setup.py
@@ -14,7 +14,7 @@
     from distutils import log as logger
     logger.warn("Wheel is not available, disabling bdist_wheel hook")
 
-VERSION = '1.2.1b1'
+VERSION = '1.4.0'
 
 # The full list of classifiers is available at
 # https://pypi.python.org/pypi?%3Aaction=list_classifiers