diff --git a/src/components/ContributionHeatmap.tsx b/src/components/ContributionHeatmap.tsx
index 740750c0a..f1b59a578 100644
--- a/src/components/ContributionHeatmap.tsx
+++ b/src/components/ContributionHeatmap.tsx
@@ -318,7 +318,7 @@ export default function ContributionHeatmap({
     commits.forEach((c) => {
       if (c.repo) reposSet.add(c.repo);
     });
-    return Array.from(reposSet).sort();
+    return Array.from(reposSet).sort((a, b) => a - b);
   }, [commits]);
 
   // Extract unique languages
@@ -329,7 +329,7 @@ export default function ContributionHeatmap({
         if (l.name) langsSet.add(l.name);
       });
     });
-    return Array.from(langsSet).sort();
+    return Array.from(langsSet).sort((a, b) => a - b);
   }, [reposData]);
 
   // Map each repo to its languages for quick lookup
diff --git a/src/hooks/useRealtimeSync.ts b/src/hooks/useRealtimeSync.ts
index 0f43efa36..fe9689c64 100644
--- a/src/hooks/useRealtimeSync.ts
+++ b/src/hooks/useRealtimeSync.ts
@@ -97,7 +97,7 @@ export function useRealtimeSync(
 
     // Stabilise `events` so an inline array definition (e.g. `["INSERT", "DELETE"]`)
     // doesn't cause the effect to re-run on every render.
-    const eventsKey = [...events].sort().join(",");
+    const eventsKey = [...events].sort((a, b) => a - b).join(",");
 
     useEffect(() => {
         const supabase = getSupabaseClient();