diff --git a/composer.json b/composer.json
index d270090..ee627d9 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "squizlabs/php_codesniffer": "2.*",
         "phpdocumentor/reflection": "^3.0",
         "erusev/parsedown": "^1.6",
-        "google/gax": "^0.33",
+        "google/gax": "^0.35",
         "opis/closure": "^3"
     },
     "suggest": {