diff --git a/src/aks-preview/HISTORY.rst b/src/aks-preview/HISTORY.rst
index da4af61af48..06291bfee13 100644
--- a/src/aks-preview/HISTORY.rst
+++ b/src/aks-preview/HISTORY.rst
@@ -11,6 +11,7 @@ To release a new version, please select a new version number (usually plus 1 to
 
 Pending
 +++++++
+* Update the enum for `--os-sku` in command `az aks nodepool update` to only accept the expected Ubuntu and AzureLinux OSSKUs.
 
 0.5.171
 +++++++
diff --git a/src/aks-preview/azext_aks_preview/_params.py b/src/aks-preview/azext_aks_preview/_params.py
index b1c98adfcf9..0073aff573c 100644
--- a/src/aks-preview/azext_aks_preview/_params.py
+++ b/src/aks-preview/azext_aks_preview/_params.py
@@ -202,7 +202,7 @@
 node_mode_types = [CONST_NODEPOOL_MODE_SYSTEM, CONST_NODEPOOL_MODE_USER]
 node_os_skus_create = [CONST_OS_SKU_AZURELINUX, CONST_OS_SKU_UBUNTU, CONST_OS_SKU_CBLMARINER, CONST_OS_SKU_MARINER]
 node_os_skus = node_os_skus_create + [CONST_OS_SKU_WINDOWS2019, CONST_OS_SKU_WINDOWS2022]
-node_os_skus_update = [CONST_OS_SKU_AZURELINUX, CONST_OS_SKU_CBLMARINER, CONST_OS_SKU_MARINER]
+node_os_skus_update = [CONST_OS_SKU_AZURELINUX, CONST_OS_SKU_UBUNTU]
 scale_down_modes = [CONST_SCALE_DOWN_MODE_DELETE, CONST_SCALE_DOWN_MODE_DEALLOCATE]
 workload_runtimes = [CONST_WORKLOAD_RUNTIME_OCI_CONTAINER, CONST_WORKLOAD_RUNTIME_WASM_WASI, CONST_WORKLOAD_RUNTIME_KATA_MSHV_VM_ISOLATION, CONST_WORKLOAD_RUNTIME_KATA_CC_ISOLATION]
 gpu_instance_profiles = [