diff --git a/sample/alphaToCoverage/index.html b/sample/alphaToCoverage/index.html
index 2839973c..6cc028d0 100644
--- a/sample/alphaToCoverage/index.html
+++ b/sample/alphaToCoverage/index.html
@@ -20,7 +20,6 @@
         display: block;
       }
     </style>
-    <script src="../../third_party/gif.js/gif.js"></script>
     <script defer type="module" src="main.js"></script>
     <script defer type="module" src="../../js/iframe-helper.js"></script>
   </head>