diff --git a/index.html b/index.html
index e6f7187..b6d6dcd 100644
--- a/index.html
+++ b/index.html
@@ -21,8 +21,8 @@
     <meta property="og:site_name" content="Tokimi Open Source">
     <meta property="og:locale" content="zh_TW">
     <meta property="og:locale:alternate" content="en_US">
-    <meta property="og:image" content="https://tokimispace.github.io/social-card-open-source-v3.png">
-    <meta property="og:image:secure_url" content="https://tokimispace.github.io/social-card-open-source-v3.png">
+    <meta property="og:image" content="https://tokimispace.github.io/social-card-open-source-v3.png?v=5">
+    <meta property="og:image:secure_url" content="https://tokimispace.github.io/social-card-open-source-v3.png?v=5">
     <meta property="og:image:type" content="image/png">
     <meta property="og:image:width" content="1200">
     <meta property="og:image:height" content="630">
@@ -30,7 +30,7 @@
     <meta name="twitter:card" content="summary_large_image">
     <meta name="twitter:title" content="Tokimi Open Source｜Five projects, explicit boundaries">
     <meta name="twitter:description" content="Rover, AstroGroot, Darkforest Web, BridgeTime Kimi Privacy, and IFF x402 Transparency with explicit, independently testable boundaries.">
-    <meta name="twitter:image" content="https://tokimispace.github.io/social-card-open-source-v3.png">
+    <meta name="twitter:image" content="https://tokimispace.github.io/social-card-open-source-v3.png?v=5">
     <meta name="twitter:image:alt" content="Tokimi Open Source signal bus branching to Tokimi Rover, AstroGroot, Darkforest Web, BridgeTime Kimi Privacy, and IFF x402 Transparency. Tokimi 開源訊號匯流排分支至五個專案。">
     <title>Tokimi Open Source｜Rover、AstroGroot、Darkforest、BridgeTime、IFF</title>
     <script>
diff --git a/scripts/check_site.py b/scripts/check_site.py
index 8929b16..0f92ac5 100644
--- a/scripts/check_site.py
+++ b/scripts/check_site.py
@@ -121,7 +121,7 @@ def main() -> int:
             failures.append(f"missing language option: {language}")
 
     social_image_url = (
-        f"https://tokimispace.github.io/{SOCIAL_CARD_BASENAME}.png"
+        f"https://tokimispace.github.io/{SOCIAL_CARD_BASENAME}.png?v=5"
     )
     for marker, failure in {
         '<meta name="robots" content="index, follow, max-image-preview:large">': "missing large-image robots directive",