diff --git a/metadata/composer.json b/metadata/composer.json
index 738904f..f722e44 100644
--- a/metadata/composer.json
+++ b/metadata/composer.json
@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8|^5.0",
-        "google/cloud-core": "1.48.1",
+        "google/cloud-core": "1.59.1",
         "phpdocumentor/reflection": "5.3.1"
     },
     "suggest": {