diff --git a/endpoints/getting-started/package.json b/endpoints/getting-started/package.json
index 3bcf208a8c..2a583dceb2 100644
--- a/endpoints/getting-started/package.json
+++ b/endpoints/getting-started/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.3.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "sinon": "4.4.2",
     "supertest": "3.3.0"
   }
diff --git a/functions/background/package.json b/functions/background/package.json
index 85feedf166..caed137319 100644
--- a/functions/background/package.json
+++ b/functions/background/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/composer-storage-trigger/package.json b/functions/composer-storage-trigger/package.json
index a26ae59992..07accc4300 100644
--- a/functions/composer-storage-trigger/package.json
+++ b/functions/composer-storage-trigger/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.2.5",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/datastore/package.json b/functions/datastore/package.json
index 93154d10ea..63dd6627c4 100644
--- a/functions/datastore/package.json
+++ b/functions/datastore/package.json
@@ -26,7 +26,7 @@
     "@google-cloud/functions-emulator": "^1.0.0-beta.4",
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/firebase/package.json b/functions/firebase/package.json
index 61df993281..f7cc9ab6d9 100644
--- a/functions/firebase/package.json
+++ b/functions/firebase/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.2.5",
     "ava": "0.25.0",
-    "proxyquire": "2.0.1",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.8",
     "supertest": "^3.0.0",
diff --git a/functions/gcs/package.json b/functions/gcs/package.json
index 502c88afeb..1497c7e48e 100644
--- a/functions/gcs/package.json
+++ b/functions/gcs/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/helloworld/package.json b/functions/helloworld/package.json
index 55342c5dc4..85c7072751 100644
--- a/functions/helloworld/package.json
+++ b/functions/helloworld/package.json
@@ -30,7 +30,7 @@
     "@google-cloud/storage": "^1.5.0",
     "ava": "0.25.0",
     "express": "^4.16.3",
-    "proxyquire": "2.0.1",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.8",
     "supertest": "^3.0.0",
diff --git a/functions/http/package.json b/functions/http/package.json
index cbdc744f5e..29c5c22ea3 100644
--- a/functions/http/package.json
+++ b/functions/http/package.json
@@ -19,7 +19,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/imagemagick/package.json b/functions/imagemagick/package.json
index 68d43e8125..4967a908ac 100644
--- a/functions/imagemagick/package.json
+++ b/functions/imagemagick/package.json
@@ -24,7 +24,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/log/package.json b/functions/log/package.json
index 7cab414bf3..f8ed5d9721 100644
--- a/functions/log/package.json
+++ b/functions/log/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/ocr/app/package.json b/functions/ocr/app/package.json
index 7899b1e76d..cf217b4f70 100644
--- a/functions/ocr/app/package.json
+++ b/functions/ocr/app/package.json
@@ -26,7 +26,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "1.4.17",
     "ava": "0.25.0",
-    "proxyquire": "1.8.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "3.2.1"
   },
diff --git a/functions/pubsub/package.json b/functions/pubsub/package.json
index 465fc782e6..8c97eee01a 100644
--- a/functions/pubsub/package.json
+++ b/functions/pubsub/package.json
@@ -23,7 +23,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/functions/sendgrid/package.json b/functions/sendgrid/package.json
index 822882961a..329a29a4aa 100644
--- a/functions/sendgrid/package.json
+++ b/functions/sendgrid/package.json
@@ -26,7 +26,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.3.0",
     "ava": "0.25.0",
-    "proxyquire": "1.8.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.0.2"
   },
diff --git a/functions/slack/package.json b/functions/slack/package.json
index 6f97f48d76..1163635ec3 100644
--- a/functions/slack/package.json
+++ b/functions/slack/package.json
@@ -22,7 +22,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "1.8.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.0.2"
   },
diff --git a/functions/spanner/package.json b/functions/spanner/package.json
index b236335c9c..d7f0e47f32 100644
--- a/functions/spanner/package.json
+++ b/functions/spanner/package.json
@@ -22,7 +22,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.0",
+    "proxyquire": "2.1.0",
     "semistandard": "^12.0.1",
     "sinon": "4.4.2"
   },
diff --git a/language/slackbot/package.json b/language/slackbot/package.json
index a5eaf5d47e..cf978b6bd9 100644
--- a/language/slackbot/package.json
+++ b/language/slackbot/package.json
@@ -28,7 +28,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "1.8.0",
+    "proxyquire": "2.1.0",
     "sinon": "3.2.0"
   }
 }
diff --git a/storage-transfer/package.json b/storage-transfer/package.json
index 374e5ffd29..4419e6b710 100644
--- a/storage-transfer/package.json
+++ b/storage-transfer/package.json
@@ -26,7 +26,7 @@
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
     "ava": "0.25.0",
-    "proxyquire": "2.0.1",
+    "proxyquire": "2.1.0",
     "sinon": "4.4.8",
     "uuid": "3.3.2"
   },