diff --git a/composer.lock b/composer.lock
index 043528fb..c4066cec 100644
--- a/composer.lock
+++ b/composer.lock
@@ -6115,16 +6115,16 @@
         },
         {
             "name": "webmozart/assert",
-            "version": "1.8.0",
+            "version": "1.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6"
+                "reference": "9dc4f203e36f2b486149058bade43c851dd97451"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/ab2cb0b3b559010b75981b1bdce728da3ee90ad6",
-                "reference": "ab2cb0b3b559010b75981b1bdce728da3ee90ad6",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/9dc4f203e36f2b486149058bade43c851dd97451",
+                "reference": "9dc4f203e36f2b486149058bade43c851dd97451",
                 "shasum": ""
             },
             "require": {
@@ -6132,6 +6132,7 @@
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
+                "phpstan/phpstan": "<0.12.20",
                 "vimeo/psalm": "<3.9.1"
             },
             "require-dev": {
@@ -6159,7 +6160,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2020-04-18T12:12:48+00:00"
+            "time": "2020-06-16T10:16:42+00:00"
         }
     ],
     "aliases": [],