diff --git a/scripts/implodeOverrides.ts b/scripts/implodeOverrides.ts
index d4c04d9..98c348f 100644
--- a/scripts/implodeOverrides.ts
+++ b/scripts/implodeOverrides.ts
@@ -57,8 +57,6 @@ async function processSubject(subjectId: string) {
     }
 
     const fileContents = await file.json();
-    delete fileContents.createdAt;
-    delete fileContents.$schema;
 
     outData.data.push(fileContents);
   }
@@ -67,6 +65,18 @@ async function processSubject(subjectId: string) {
   const schemaPath = relative(overridesPath, schemaAbsolutePath);
   outData.$schema = schemaPath;
 
+  let updatedAt = outData.updatedAt;
+  for (const data of outData.data) {
+    const createdAt = data.createdAt;
+
+    delete data.createdAt;
+    delete data.$schema;
+
+    updatedAt = Math.max(data.updatedAt ?? 0, createdAt ?? 0);
+  }
+
+  outData.updatedAt = updatedAt;
+
   const outFile = Bun.file(join(overridesPath, `${subjectId}.json`));
   await Bun.write(outFile, stringify(outData));
 }