diff --git a/package.json b/package.json
index ecae3cd..a351e83 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "eslint-plugin-import": "^2",
     "eslint-plugin-lit": "^1",
     "eslint-plugin-sort-class-members": "^1",
-    "sinon": "^14"
+    "sinon": "^15"
   },
   "files": [
     "d2l-file-uploader.js",