diff --git a/bicep/main.bicep b/bicep/main.bicep
index 9e8a9fe44..c1947a682 100644
--- a/bicep/main.bicep
+++ b/bicep/main.bicep
@@ -1375,7 +1375,7 @@ param osSKU string = 'Ubuntu'
 var poolName = osType == 'Linux' ? nodePoolName : take(nodePoolName, 6)
 
 // Default OS Disk Size in GB for Linux is 30, for Windows is 100
-var defaultOsDiskSizeGB = osType == 'Linux' ? 30 : 100
+var defaultOsDiskSizeGB = 128
 
 module userNodePool '../bicep/aksagentpool.bicep' = if (!JustUseSystemPool){
   name: take('${deployment().name}-userNodePool',64)
diff --git a/helper/src/config.json b/helper/src/config.json
index 849625975..713f2e6b5 100644
--- a/helper/src/config.json
+++ b/helper/src/config.json
@@ -50,7 +50,7 @@
             "maxCount": 20,
             "computeType": "gp",
             "vmSize": "Standard_D4ds_v5",
-            "osDiskSizeGB": 30,
+            "osDiskSizeGB": 128,
             "osDiskType": "Ephemeral",
             "enable_aad": true,
             "AksDisableLocalAccounts": false,