diff --git a/build/allowedValues.json b/build/allowedValues.json
index 2ee48c30..6996528a 100644
--- a/build/allowedValues.json
+++ b/build/allowedValues.json
@@ -1,18 +1,13 @@
 {
   "versions": [
-    "5.5.3",
-    "5.6.12",
+    "5.6.14",
     "6.0.1",
     "6.1.3",
     "6.2.4",
     "6.3.2",
-    "6.4.1",
-    "6.4.2",
     "6.4.3",
-    "6.5.0",
-    "6.5.1",
-    "6.5.2",
-    "6.5.3"
+    "6.5.4",
+    "6.6.0"
   ],
   "numberOfDataNodes" : 50,
   "numberOfClientNodes" : 20,
diff --git a/src/createUiDefinition.json b/src/createUiDefinition.json
index 9193efcf..ef38960d 100644
--- a/src/createUiDefinition.json
+++ b/src/createUiDefinition.json
@@ -54,17 +54,13 @@
             "name": "esVersion",
             "type": "Microsoft.Common.DropDown",
             "label": "Elasticsearch version",
-            "defaultValue": "v6.5.3",
+            "defaultValue": "v6.6.0",
             "toolTip": "Choose a version of Elasticsearch.",
             "constraints": {
               "allowedValues": [
                 {
-                  "label": "v5.5.3",
-                  "value": "5.5.3"
-                },
-                {
-                  "label": "v5.6.12",
-                  "value": "5.6.12"
+                  "label": "v5.6.14",
+                  "value": "5.6.14"
                 },
                 {
                   "label": "v6.0.1",
@@ -82,33 +78,17 @@
                   "label": "v6.3.2",
                   "value": "6.3.2"
                 },
-                {
-                  "label": "v6.4.1",
-                  "value": "6.4.1"
-                },
-                {
-                  "label": "v6.4.2",
-                  "value": "6.4.2"
-                },
                 {
                   "label": "v6.4.3",
                   "value": "6.4.3"
                 },
                 {
-                  "label": "v6.5.0",
-                  "value": "6.5.0"
-                },
-                {
-                  "label": "v6.5.1",
-                  "value": "6.5.1"
-                },
-                {
-                  "label": "v6.5.2",
-                  "value": "6.5.2"
+                  "label": "v6.5.4",
+                  "value": "6.5.4"
                 },
                 {
-                  "label": "v6.5.3",
-                  "value": "6.5.3"
+                  "label": "v6.6.0",
+                  "value": "6.6.0"
                 }
               ]
             }
diff --git a/src/mainTemplate.json b/src/mainTemplate.json
index 1444e0c3..bd64b9ea 100644
--- a/src/mainTemplate.json
+++ b/src/mainTemplate.json
@@ -21,21 +21,16 @@
     },
     "esVersion": {
       "type": "string",
-      "defaultValue": "6.5.3",
+      "defaultValue": "6.6.0",
       "allowedValues": [
-        "5.5.3",
-        "5.6.12",
+        "5.6.14",
         "6.0.1",
         "6.1.3",
         "6.2.4",
         "6.3.2",
-        "6.4.1",
-        "6.4.2",
         "6.4.3",
-        "6.5.0",
-        "6.5.1",
-        "6.5.2",
-        "6.5.3"
+        "6.5.4",
+        "6.6.0"
       ],
       "metadata": {
         "description": "Elasticsearch version to install"