diff --git a/functions/spanner/package.json b/functions/spanner/package.json
index 4d68eb7a02..25c12f8cd4 100644
--- a/functions/spanner/package.json
+++ b/functions/spanner/package.json
@@ -15,7 +15,7 @@
     "test": "mocha test/*.test.js --timeout=20000"
   },
   "dependencies": {
-    "@google-cloud/spanner": "^3.1.0"
+    "@google-cloud/spanner": "^4.0.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.3.0",