diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/appplatform.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/appplatform.json
index 72a4748132a2..46ffa1bd76f4 100644
--- a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/appplatform.json
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/appplatform.json
@@ -2163,6 +2163,39 @@
         }
       }
     },
+    "/providers/Microsoft.AppPlatform/runtimeVersions": {
+      "get": {
+        "tags": [
+          "AppPlatform"
+        ],
+        "description": "Lists all of the available runtime versions supported by Microsoft.AppPlatform provider.",
+        "operationId": "RuntimeVersions_ListRuntimeVersions",
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success. The response describes the details of all supported deployment runtime versions.",
+            "schema": {
+              "$ref": "#/definitions/AvailableRuntimeVersions"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "RuntimeVersions_ListRuntimeVersions": {
+            "$ref": "./examples/RuntimeVersions_ListRuntimeVersions.json"
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/providers/Microsoft.AppPlatform/skus": {
       "get": {
         "tags": [
@@ -3191,6 +3224,7 @@
           "description": "Type of the source uploaded",
           "enum": [
             "Jar",
+            "NetCoreZip",
             "Source"
           ],
           "type": "string",
@@ -3233,6 +3267,10 @@
           "description": "JVM parameter",
           "type": "string"
         },
+        "netCoreMainEntryPath": {
+          "description": "The path to the .NET executable relative to zip root",
+          "type": "string"
+        },
         "instanceCount": {
           "format": "int32",
           "description": "Instance count, basic tier should be in range (1, 25), standard tier should be in range (1, 500)",
@@ -3250,7 +3288,8 @@
           "description": "Runtime version",
           "enum": [
             "Java_8",
-            "Java_11"
+            "Java_11",
+            "NetCore_31"
           ],
           "type": "string",
           "x-ms-enum": {
@@ -3777,6 +3816,57 @@
         }
       },
       "x-ms-external": true
+    },
+    "AvailableRuntimeVersions": {
+      "type": "object",
+      "properties": {
+        "value": {
+          "description": "A list of all supported runtime versions.",
+          "uniqueItems": false,
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/SupportedRuntimeVersion"
+          },
+          "readOnly": true
+        }
+      },
+      "readOnly": true
+    },
+    "SupportedRuntimeVersion": {
+      "description": "Supported deployment runtime version descriptor.",
+      "type": "object",
+      "properties": {
+        "value": {
+          "description": "The raw value which could be passed to deployment CRUD operations.",
+          "enum": [
+            "Java_8",
+            "Java_11",
+            "NetCore_31"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "SupportedRuntimeVersion",
+            "modelAsString": true
+          }
+        },
+        "platform": {
+          "description": "The platform of this runtime version (possible values: \"Java\" or \".NET\").",
+          "enum": [
+            "Java",
+            ".NET Core"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "SupportedRuntimePlatform",
+            "modelAsString": true
+          }
+        },
+        "version": {
+          "description": "The detailed version (major.minor) of the platform.",
+          "type": "string"
+        }
+      },
+      "readOnly": true
     }
   },
   "parameters": {
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/examples/RuntimeVersions_ListRuntimeVersions.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/examples/RuntimeVersions_ListRuntimeVersions.json
new file mode 100644
index 000000000000..051d4085549f
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/preview/2019-05-01-preview/examples/RuntimeVersions_ListRuntimeVersions.json
@@ -0,0 +1,28 @@
+{
+  "parameters": {
+    "api-version": "2019-05-01-preview"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "value": [
+          {
+            "value": "Java_8",
+            "platform": "Java",
+            "version": "8"
+          },
+          {
+            "value": "Java_11",
+            "platform": "Java",
+            "version": "11"
+          },
+          {
+            "value": "NetCore_31",
+            "platform": ".NET Core",
+            "version": "3.1"
+          }
+        ]
+      }
+    }
+  }
+}
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/appplatform.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/appplatform.json
index 8bd7bdf0d709..ae76a38cec67 100644
--- a/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/appplatform.json
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/appplatform.json
@@ -2607,6 +2607,39 @@
         }
       }
     },
+    "/providers/Microsoft.AppPlatform/runtimeVersions": {
+      "get": {
+        "tags": [
+          "AppPlatform"
+        ],
+        "description": "Lists all of the available runtime versions supported by Microsoft.AppPlatform provider.",
+        "operationId": "RuntimeVersions_ListRuntimeVersions",
+        "parameters": [
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "Success. The response describes the details of all supported deployment runtime versions.",
+            "schema": {
+              "$ref": "#/definitions/AvailableRuntimeVersions"
+            }
+          },
+          "default": {
+            "description": "Error response describing why the operation failed.",
+            "schema": {
+              "$ref": "#/definitions/CloudError"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "RuntimeVersions_ListRuntimeVersions": {
+            "$ref": "./examples/RuntimeVersions_ListRuntimeVersions.json"
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/providers/Microsoft.AppPlatform/skus": {
       "get": {
         "tags": [
@@ -3667,6 +3700,7 @@
           "description": "Type of the source uploaded",
           "enum": [
             "Jar",
+            "NetCoreZip",
             "Source"
           ],
           "type": "string",
@@ -3709,6 +3743,10 @@
           "description": "JVM parameter",
           "type": "string"
         },
+        "netCoreMainEntryPath": {
+          "description": "The path to the .NET executable relative to zip root",
+          "type": "string"
+        },
         "environmentVariables": {
           "description": "Collection of environment variables",
           "type": "object",
@@ -3720,7 +3758,8 @@
           "description": "Runtime version",
           "enum": [
             "Java_8",
-            "Java_11"
+            "Java_11",
+            "NetCore_31"
           ],
           "type": "string",
           "x-ms-enum": {
@@ -4253,6 +4292,57 @@
         }
       },
       "x-ms-external": true
+    },
+    "AvailableRuntimeVersions": {
+      "type": "object",
+      "properties": {
+        "value": {
+          "description": "A list of all supported runtime versions.",
+          "uniqueItems": false,
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/SupportedRuntimeVersion"
+          },
+          "readOnly": true
+        }
+      },
+      "readOnly": true
+    },
+    "SupportedRuntimeVersion": {
+      "description": "Supported deployment runtime version descriptor.",
+      "type": "object",
+      "properties": {
+        "value": {
+          "description": "The raw value which could be passed to deployment CRUD operations.",
+          "enum": [
+            "Java_8",
+            "Java_11",
+            "NetCore_31"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "SupportedRuntimeVersion",
+            "modelAsString": true
+          }
+        },
+        "platform": {
+          "description": "The platform of this runtime version (possible values: \"Java\" or \".NET\").",
+          "enum": [
+            "Java",
+            ".NET Core"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "SupportedRuntimePlatform",
+            "modelAsString": true
+          }
+        },
+        "version": {
+          "description": "The detailed version (major.minor) of the platform.",
+          "type": "string"
+        }
+      },
+      "readOnly": true
     }
   },
   "parameters": {
diff --git a/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/examples/RuntimeVersions_ListRuntimeVersions.json b/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/examples/RuntimeVersions_ListRuntimeVersions.json
new file mode 100644
index 000000000000..1023f932df8c
--- /dev/null
+++ b/specification/appplatform/resource-manager/Microsoft.AppPlatform/stable/2020-07-01/examples/RuntimeVersions_ListRuntimeVersions.json
@@ -0,0 +1,28 @@
+{
+  "parameters": {
+    "api-version": "2020-07-01"
+  },
+  "responses": {
+    "200": {
+      "body": {
+        "value": [
+          {
+            "value": "Java_8",
+            "platform": "Java",
+            "version": "8"
+          },
+          {
+            "value": "Java_11",
+            "platform": "Java",
+            "version": "11"
+          },
+          {
+            "value": "NetCore_31",
+            "platform": ".NET Core",
+            "version": "3.1"
+          }
+        ]
+      }
+    }
+  }
+}