diff --git a/package_esp32_dev_index.json b/package_esp32_dev_index.json
index 9692e877..74817b88 100644
--- a/package_esp32_dev_index.json
+++ b/package_esp32_dev_index.json
@@ -9,6 +9,47 @@
         "online": "http://esp32.com"
       },
       "platforms": [
+        {
+          "name": "esp32",
+          "architecture": "esp32",
+          "version": "1.0.5-rc3",
+          "category": "ESP32",
+          "url": "https://github.com/espressif/arduino-esp32/releases/download/1.0.5-rc3/esp32-1.0.5-rc3.zip",
+          "archiveFileName": "esp32-1.0.5-rc3.zip",
+          "checksum": "SHA-256:bb82ab4727c26e18503a8c02ad8e2dc1ba62113cee54e3f605b95e2de1053b65",
+          "size": "47478086",
+          "help": {
+            "online": ""
+          },
+          "boards": [
+            {
+              "name": "ESP32 Dev Module"
+            },
+            {
+              "name": "WEMOS LoLin32"
+            },
+            {
+              "name": "WEMOS D1 MINI ESP32"
+            }
+          ],
+          "toolsDependencies": [
+            {
+              "packager": "esp32",
+              "name": "xtensa-esp32-elf-gcc",
+              "version": "1.22.0-96-g2852398-5.2.0"
+            },
+            {
+              "packager": "esp32",
+              "name": "esptool_py",
+              "version": "3.0.0"
+            },
+            {
+              "packager": "esp32",
+              "name": "mkspiffs",
+              "version": "0.2.3"
+            }
+          ]
+        },
         {
           "name": "esp32",
           "architecture": "esp32",