diff --git a/composer.json b/composer.json
index e865148..8279ff5 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
         "php-http/multipart-stream-builder": "^1.0",
         "php-http/client-common": "^1.9 || ^2.0",
         "php-http/discovery": "^1.6",
-        "webmozart/assert": "^1.2"
+        "webmozart/assert": "^1.6"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.5",