diff --git a/composer.json b/composer.json
index fed6353..6be63c1 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
     },
     "require-dev": {
         "google/cloud-core": "^1.20",
-        "google/gax": "^0.35.0",
+        "google/gax": "^1.0.0",
         "paragonie/random_compat": ">=2",
         "phpunit/phpunit": "^9",
         "friendsofphp/php-cs-fixer": "^3.17",