diff --git a/composer.json b/composer.json
index 7f6f63f..45ba818 100644
--- a/composer.json
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diff --git a/composer.lock b/composer.lock
index 8d2ecc5..74847dd 100644
--- a/composer.lock
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-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "30eed06dd6bc88410a4ff7f77b6d22f3ce13dbde"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/30eed06dd6bc88410a4ff7f77b6d22f3ce13dbde",
-                "reference": "30eed06dd6bc88410a4ff7f77b6d22f3ce13dbde",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<3.9.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6"
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -2202,7 +2405,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2015-08-24 13:29:44"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.9.1"
+            },
+            "time": "2020-07-08T17:02:28+00:00"
         }
     ],
     "aliases": [],
@@ -2213,5 +2420,6 @@
     "platform": {
         "php": ">=5.5.0"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "2.2.0"
 }