diff --git a/appengine/metadata/flexible/package.json b/appengine/metadata/flexible/package.json
index 7daba51b3a..060d00bd2d 100644
--- a/appengine/metadata/flexible/package.json
+++ b/appengine/metadata/flexible/package.json
@@ -23,7 +23,8 @@
     "got": "8.2.0"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "^2.3.0"
+    "@google-cloud/nodejs-repo-tools": "^2.3.0",
+    "semistandard": "^12.0.1"
   },
   "cloud-repo-tools": {
     "test": {
diff --git a/appengine/metadata/standard/package.json b/appengine/metadata/standard/package.json
index c625bcb2d7..fbac9e15fc 100644
--- a/appengine/metadata/standard/package.json
+++ b/appengine/metadata/standard/package.json
@@ -23,7 +23,8 @@
     "got": "8.2.0"
   },
   "devDependencies": {
-    "@google-cloud/nodejs-repo-tools": "^2.3.0"
+    "@google-cloud/nodejs-repo-tools": "^2.3.0",
+    "semistandard": "^12.0.1"
   },
   "cloud-repo-tools": {
     "test": {