diff --git a/package.json b/package.json
index d790c8fc..4028412b 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
     "p-queue": "^6.6.1",
     "pack-n-play": "^2.0.0",
     "proxyquire": "^2.1.3",
-    "sinon": "^17.0.0",
+    "sinon": "^18.0.0",
     "ts-loader": "^8.0.0",
     "typescript": "^5.1.6",
     "webpack-cli": "^5.0.0"
diff --git a/samples/package.json b/samples/package.json
index 8c147e2c..013c250c 100644
--- a/samples/package.json
+++ b/samples/package.json
@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@google-cloud/datastore": "^9.0.0",
-    "sinon": "^17.0.0"
+    "sinon": "^18.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",