diff --git a/src/static/checkout.html b/src/static/checkout.html
index 10ed7d5..d46b2d0 100644
--- a/src/static/checkout.html
+++ b/src/static/checkout.html
@@ -10,10 +10,10 @@
     </style>
     <link
       rel="stylesheet"
-      href="https://sdk.primer.io/web/v2.28.0/Checkout.css"
+      href="https://sdk.primer.io/web/v2.31.0/Checkout.css"
     />
     <script
-      src="https://sdk.primer.io/web/v2.28.0/Primer.min.js"
+      src="https://sdk.primer.io/web/v2.31.0/Primer.min.js"
       crossorigin="anonymous"
     ></script>
     <link rel="stylesheet" href="/static/style.css" />