diff --git a/appengine/building-an-app/update/package.json b/appengine/building-an-app/update/package.json
index 161d10f12b..fb6e4196b1 100644
--- a/appengine/building-an-app/update/package.json
+++ b/appengine/building-an-app/update/package.json
@@ -25,6 +25,6 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   }
 }
diff --git a/appengine/cloudsql/package.json b/appengine/cloudsql/package.json
index 59dd12ef8c..cb73e08666 100644
--- a/appengine/cloudsql/package.json
+++ b/appengine/cloudsql/package.json
@@ -30,7 +30,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0"
   },
   "cloud-repo-tools": {
diff --git a/appengine/cloudsql_postgresql/package.json b/appengine/cloudsql_postgresql/package.json
index e7095c2419..acc5abfa61 100644
--- a/appengine/cloudsql_postgresql/package.json
+++ b/appengine/cloudsql_postgresql/package.json
@@ -30,7 +30,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0"
   },
   "cloud-repo-tools": {
diff --git a/appengine/endpoints/package.json b/appengine/endpoints/package.json
index 21e4ee6637..218f7230dd 100644
--- a/appengine/endpoints/package.json
+++ b/appengine/endpoints/package.json
@@ -29,7 +29,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0"
   }
 }
diff --git a/appengine/pubsub/package.json b/appengine/pubsub/package.json
index bd0dd657f6..8b59c089a1 100644
--- a/appengine/pubsub/package.json
+++ b/appengine/pubsub/package.json
@@ -23,7 +23,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "jsonwebtoken": "^8.5.1",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.3.2"
   },
   "cloud-repo-tools": {
diff --git a/appengine/twilio/package.json b/appengine/twilio/package.json
index ba0e0e261c..0e99eeea9b 100644
--- a/appengine/twilio/package.json
+++ b/appengine/twilio/package.json
@@ -20,7 +20,7 @@
   "devDependencies": {
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.2"
   }
 }
diff --git a/cloud-sql/mysql/mysql/package.json b/cloud-sql/mysql/mysql/package.json
index 42efa9a73f..ac8a86d560 100644
--- a/cloud-sql/mysql/mysql/package.json
+++ b/cloud-sql/mysql/mysql/package.json
@@ -28,6 +28,6 @@
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
     "supertest": "^4.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   }
 }
diff --git a/cloud-tasks/function/package.json b/cloud-tasks/function/package.json
index 6286cd8ffe..2de88e37b8 100644
--- a/cloud-tasks/function/package.json
+++ b/cloud-tasks/function/package.json
@@ -15,6 +15,6 @@
   "devDependencies": {
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   }
 }
diff --git a/datastore/functions/package.json b/datastore/functions/package.json
index 27013ae78c..a69d759567 100644
--- a/datastore/functions/package.json
+++ b/datastore/functions/package.json
@@ -25,7 +25,7 @@
     "proxyquire": "^2.1.0",
     "request": "^2.88.0",
     "requestretry": "^4.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.3.2"
   }
 }
diff --git a/endpoints/getting-started/package.json b/endpoints/getting-started/package.json
index 1c3de53e5b..233efe3ea0 100644
--- a/endpoints/getting-started/package.json
+++ b/endpoints/getting-started/package.json
@@ -24,7 +24,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0"
   }
 }
diff --git a/functions/billing/package.json b/functions/billing/package.json
index 6e288453b4..abc66feb00 100644
--- a/functions/billing/package.json
+++ b/functions/billing/package.json
@@ -26,6 +26,6 @@
     "proxyquire": "^2.1.0",
     "request": "^2.88.0",
     "requestretry": "^4.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   }
 }
diff --git a/functions/composer-storage-trigger/package.json b/functions/composer-storage-trigger/package.json
index 8f3fa54ebe..00b6e64afc 100644
--- a/functions/composer-storage-trigger/package.json
+++ b/functions/composer-storage-trigger/package.json
@@ -19,7 +19,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "scripts": {
     "test": "mocha test/*.test.js --timeout=20000"
diff --git a/functions/concepts/package.json b/functions/concepts/package.json
index cfaf2b9e74..e0b01adddb 100644
--- a/functions/concepts/package.json
+++ b/functions/concepts/package.json
@@ -17,7 +17,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0"
   },
   "scripts": {
diff --git a/functions/env_vars/package.json b/functions/env_vars/package.json
index 80a33097eb..5c457b9131 100644
--- a/functions/env_vars/package.json
+++ b/functions/env_vars/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/firebase/package.json b/functions/firebase/package.json
index 5d7a874ecc..e655d339e0 100644
--- a/functions/firebase/package.json
+++ b/functions/firebase/package.json
@@ -18,7 +18,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.0",
     "uuid": "^3.1.0"
   },
diff --git a/functions/helloworld/package.json b/functions/helloworld/package.json
index 63bdf6fe64..becdc7dc77 100644
--- a/functions/helloworld/package.json
+++ b/functions/helloworld/package.json
@@ -35,7 +35,7 @@
     "proxyquire": "^2.1.0",
     "request": "^2.88.0",
     "requestretry": "^4.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.1.0",
     "yargs": "^15.0.0"
   },
diff --git a/functions/http/package.json b/functions/http/package.json
index 06b176ea29..e91ec35f96 100644
--- a/functions/http/package.json
+++ b/functions/http/package.json
@@ -18,7 +18,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.3.2"
   },
   "dependencies": {
diff --git a/functions/imagemagick/package.json b/functions/imagemagick/package.json
index 37b1662bf7..282ba9f4c6 100644
--- a/functions/imagemagick/package.json
+++ b/functions/imagemagick/package.json
@@ -27,7 +27,7 @@
     "proxyquire": "^2.1.0",
     "request": "^2.88.0",
     "requestretry": "^4.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/log/package.json b/functions/log/package.json
index 24b1c294a8..32679aa8e9 100644
--- a/functions/log/package.json
+++ b/functions/log/package.json
@@ -22,7 +22,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/memorystore/redis/package.json b/functions/memorystore/redis/package.json
index e412285953..bfc5babe66 100644
--- a/functions/memorystore/redis/package.json
+++ b/functions/memorystore/redis/package.json
@@ -20,6 +20,6 @@
   },
   "devDependencies": {
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   }
 }
diff --git a/functions/node8/package.json b/functions/node8/package.json
index b3988e72ba..9ef1665428 100644
--- a/functions/node8/package.json
+++ b/functions/node8/package.json
@@ -21,7 +21,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.3.2"
   },
   "dependencies": {
diff --git a/functions/ocr/app/package.json b/functions/ocr/app/package.json
index 17b7b2718f..730e3d5c4e 100644
--- a/functions/ocr/app/package.json
+++ b/functions/ocr/app/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/pubsub/package.json b/functions/pubsub/package.json
index 59bde37d4c..681976ae1e 100644
--- a/functions/pubsub/package.json
+++ b/functions/pubsub/package.json
@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "@google-cloud/pubsub": "^1.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "devDependencies": {
     "@google-cloud/functions-framework": "^1.3.2",
diff --git a/functions/scheduleinstance/package.json b/functions/scheduleinstance/package.json
index e6eb574e2d..03a1ad999a 100644
--- a/functions/scheduleinstance/package.json
+++ b/functions/scheduleinstance/package.json
@@ -18,7 +18,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "dependencies": {
     "@google-cloud/compute": "^1.0.0"
diff --git a/functions/sendgrid/package.json b/functions/sendgrid/package.json
index 98e5589001..6ba54c50e0 100644
--- a/functions/sendgrid/package.json
+++ b/functions/sendgrid/package.json
@@ -24,7 +24,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/slack/package.json b/functions/slack/package.json
index 73f9bc7948..b8e7dcdda0 100644
--- a/functions/slack/package.json
+++ b/functions/slack/package.json
@@ -22,7 +22,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/spanner/package.json b/functions/spanner/package.json
index 4efa8eaf7a..d334d801b1 100644
--- a/functions/spanner/package.json
+++ b/functions/spanner/package.json
@@ -21,7 +21,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/sql/package.json b/functions/sql/package.json
index ec600b8aed..5b583ec1e9 100644
--- a/functions/sql/package.json
+++ b/functions/sql/package.json
@@ -27,7 +27,7 @@
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/functions/tips/package.json b/functions/tips/package.json
index 3e6234213a..80e41bbe20 100644
--- a/functions/tips/package.json
+++ b/functions/tips/package.json
@@ -20,7 +20,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0"
+    "sinon": "^9.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/run/pubsub/package.json b/run/pubsub/package.json
index 9f7602bbd9..b4c8cb5af9 100644
--- a/run/pubsub/package.json
+++ b/run/pubsub/package.json
@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "mocha": "^7.0.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "supertest": "^4.0.2",
     "uuid": "^3.3.2"
   }
diff --git a/storage-transfer/package.json b/storage-transfer/package.json
index f519eb175b..326f07e682 100644
--- a/storage-transfer/package.json
+++ b/storage-transfer/package.json
@@ -26,7 +26,7 @@
     "@google-cloud/storage": "^4.0.0",
     "mocha": "^7.0.0",
     "proxyquire": "^2.1.0",
-    "sinon": "^8.0.0",
+    "sinon": "^9.0.0",
     "uuid": "^3.3.2"
   }
 }