diff --git a/ExternalApps/HelloWorld/tactility.properties b/ExternalApps/HelloWorld/tactility.properties
index 14c0bdfb..aa5aa4a2 100644
--- a/ExternalApps/HelloWorld/tactility.properties
+++ b/ExternalApps/HelloWorld/tactility.properties
@@ -1,2 +1,2 @@
 [sdk]
-version = 0.4.0-dev
+version = 0.4.0
diff --git a/ExternalApps/HelloWorld/tactility.py b/ExternalApps/HelloWorld/tactility.py
index e27ed647..310de9f3 100644
--- a/ExternalApps/HelloWorld/tactility.py
+++ b/ExternalApps/HelloWorld/tactility.py
@@ -15,7 +15,7 @@ platform_targets = ["esp32", "esp32s3"]
 platform_arguments = platform_targets.copy()
 platform_arguments.append("all")
 ttbuild_path = ".tactility"
-ttbuild_version = "0.3.0"
+ttbuild_version = "1.0.0"
 ttbuild_properties_file = "tactility.properties"
 ttbuild_cdn = "https://cdn.tactility.one"
 ttbuild_sdk_json_validity = 3600  # seconds