diff --git a/composer.json b/composer.json
index 00deb52..c259684 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
     },
 
     "require-dev": {
-        "phpunit/phpunit": "^9.3",
+        "phpunit/phpunit": "^9.5",
         "squizlabs/php_codesniffer": "^3.5"
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 }
diff --git a/composer.lock b/composer.lock
index 6b4aed7..d5acac6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "018050356a426fc1a348276182f1ef54",
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@@ -515,16 +515,16 @@
         },
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+            "version": "1.13.0",
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                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "245710e971a030f42e08f4912863805570f23d39"
+                "reference": "be1996ed8adc35c3fd795488a653f4b518be70ea"
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-                "reference": "245710e971a030f42e08f4912863805570f23d39",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/be1996ed8adc35c3fd795488a653f4b518be70ea",
+                "reference": "be1996ed8adc35c3fd795488a653f4b518be70ea",
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@@ -576,9 +576,9 @@
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             "support": {
                 "issues": "https://github.com/phpspec/prophecy/issues",
-                "source": "https://github.com/phpspec/prophecy/tree/1.12.2"
+                "source": "https://github.com/phpspec/prophecy/tree/1.13.0"
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-            "time": "2020-12-19T10:15:11+00:00"
+            "time": "2021-03-17T13:42:18+00:00"
         },
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             "name": "phpunit/php-code-coverage",
@@ -900,16 +900,16 @@
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-            "version": "9.5.2",
+            "version": "9.5.3",
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                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "f661659747f2f87f9e72095bb207bceb0f151cb4"
+                "reference": "27241ac75fc37ecf862b6e002bf713b6566cbe41"
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-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/f661659747f2f87f9e72095bb207bceb0f151cb4",
-                "reference": "f661659747f2f87f9e72095bb207bceb0f151cb4",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/27241ac75fc37ecf862b6e002bf713b6566cbe41",
+                "reference": "27241ac75fc37ecf862b6e002bf713b6566cbe41",
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@@ -987,7 +987,7 @@
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                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.2"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.3"
             },
             "funding": [
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@@ -999,7 +999,7 @@
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-            "time": "2021-02-02T14:45:58+00:00"
+            "time": "2021-03-17T07:30:34+00:00"
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@@ -2152,30 +2152,35 @@
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-            "version": "1.9.1",
+            "version": "1.10.0",
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                 "url": "https://github.com/webmozarts/assert.git",
-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
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-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
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             "require": {
-                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
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             "conflict": {
                 "phpstan/phpstan": "<0.12.20",
-                "vimeo/psalm": "<3.9.1"
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
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             "require-dev": {
-                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -2199,9 +2204,9 @@
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             "support": {
                 "issues": "https://github.com/webmozarts/assert/issues",
-                "source": "https://github.com/webmozarts/assert/tree/1.9.1"
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
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-            "time": "2020-07-08T17:02:28+00:00"
+            "time": "2021-03-09T10:59:23+00:00"
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     "aliases": [],