diff --git a/packages/eventual-send/package.json b/packages/eventual-send/package.json
index f472bf1bac..daa9731971 100644
--- a/packages/eventual-send/package.json
+++ b/packages/eventual-send/package.json
@@ -41,7 +41,7 @@
   "devDependencies": {
     "@endo/lockdown": "workspace:^",
     "ava": "^6.1.3",
-    "c8": "^7.14.0",
+    "c8": "^10.1.2",
     "tsd": "^0.31.2",
     "typescript": "~5.6.2"
   },