diff --git a/ios/scripts/make-source.py b/ios/scripts/make-source.py
index 06e0732..a3f5dd9 100755
--- a/ios/scripts/make-source.py
+++ b/ios/scripts/make-source.py
@@ -19,7 +19,13 @@ def get(url):
 
 
 yml = open(os.path.join(HERE, "..", "project.yml")).read()
-builds = {}  # only the current build number is known locally; older ones fall back to the version
+# Build numbers: older ones from the last source.json, the current one from project.yml.
+builds = {}
+try:
+    for v in json.load(open(os.path.join(HERE, "..", "source.json")))["apps"][0]["versions"]:
+        builds[v["version"]] = v["buildVersion"]
+except (OSError, ValueError, KeyError, IndexError):
+    pass
 m = re.search(r'MARKETING_VERSION: "(.*)"', yml), re.search(r'CURRENT_PROJECT_VERSION: "(.*)"', yml)
 builds[m[0][1]] = m[1][1]
 
diff --git a/ios/source.json b/ios/source.json
index ff30beb..09eb2e5 100644
--- a/ios/source.json
+++ b/ios/source.json
@@ -26,7 +26,7 @@
         },
         {
           "version": "1.0.3",
-          "buildVersion": "1.0.3",
+          "buildVersion": "4",
           "date": "2026-10-20T09:08:18-07:00",
           "localizedDescription": "Bundle ID is now org.cdnutter.stemify (delete the old app first; settings won't carry over). IPA is named stemify-<version>.ipa. Adds an AltStore/SideStore/Feather source.",
           "downloadURL": "https://git.iamchrisama.com/cdnutter/stemify/releases/download/ios-v1.0.3/stemify-1.0.3.ipa",