diff --git a/README.md b/README.md
index 07fc813..6a3a934 100644
--- a/README.md
+++ b/README.md
@@ -27,5 +27,5 @@ To build an Xcode image (don't forget to setup `FASTLANE_USER` and `FASTLANE_PAS
 [xcode-install](https://github.com/KrauseFx/xcode-install#usage)):
 
 ```bash
-packer build -var xcode_version="10.0" templates/mojave-xcode.json
+packer build -var xcode_version="10.1" templates/mojave-xcode.json
 ```
\ No newline at end of file
diff --git a/templates/mojave-xcode.json b/templates/mojave-xcode.json
index 2030688..6b05db8 100644
--- a/templates/mojave-xcode.json
+++ b/templates/mojave-xcode.json
@@ -13,7 +13,7 @@
   "variables": {
     "fastlane_user": "{{env `FASTLANE_USER`}}",
     "fastlane_password": "{{env `FASTLANE_PASSWORD`}}",
-    "xcode_version": "10.0"
+    "xcode_version": "10.1"
   },
   "provisioners": [
     {
@@ -41,8 +41,8 @@
         "xcversion install $XCODE_VERSION",
         "xcversion select $XCODE_VERSION",
         "xcversion simulators",
-        "xcversion simulators --install='iOS 11.4'",
-        "xcversion simulators --install='watchOS 4.2'",
+        "xcversion simulators --install='iOS 12.0'",
+        "xcversion simulators --install='watchOS 5.0'",
         "xcversion cleanup"
       ],
       "type": "shell"