diff --git a/package.json b/package.json
index 90d1a2da..d5e77d8e 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "@types/mocha": "^9.0.0",
     "@types/node": "^20.0.0",
     "@types/sinon": "^10.0.0",
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "gapic-tools": "^0.3.0",
     "gts": "^5.0.0",
     "jsdoc": "^4.0.0",
diff --git a/samples/package.json b/samples/package.json
index f4bf38eb..8a590bed 100644
--- a/samples/package.json
+++ b/samples/package.json
@@ -21,7 +21,7 @@
     "snappy": "^7.0.0"
   },
   "devDependencies": {
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "chai": "^4.2.0",
     "mocha": "^10.2.0",
     "uuid": "^9.0.0"