diff --git a/scripts/_ensure_packages_have_version.py b/scripts/_ensure_packages_have_version.py
new file mode 100644
index 00000000..a0e21336
--- /dev/null
+++ b/scripts/_ensure_packages_have_version.py
@@ -0,0 +1,6 @@
+
+def ensure_packages_have_version(theme_data):
+    if 'version' not in theme_data:
+        print("  Version is required in theme.json. Adding default value of 1.0.0.")
+        theme_data['version'] = '1.0.0'
+    return theme_data
\ No newline at end of file
diff --git a/scripts/rebuild-themes.py b/scripts/rebuild-themes.py
index 1a545890..e92325b0 100644
--- a/scripts/rebuild-themes.py
+++ b/scripts/rebuild-themes.py
@@ -2,6 +2,8 @@
 import os
 import json
 
+import _ensure_packages_have_version
+
 THEMES_FOLDER = './themes'
 THEMES_DATA_FILE = './themes.json'
 
@@ -46,6 +48,7 @@ def main():
             continue
         with open(theme_data_file, 'r') as f:
             theme_data = json.load(f)
+            theme_data = _ensure_packages_have_version.ensure_packages_have_version(theme_data)
             with open(THEMES_DATA_FILE, 'r') as f:
                 themes_data = json.load(f)
                 theme_colors_file = os.path.join(theme_folder, 'colors.json')