diff --git a/composer.json b/composer.json
index 092ae85..c3a7f8e 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         }
     },
     "require": {
-        "google/gax": "^0.34"
+        "google/gax": "^0.35"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8|^5.0",