diff --git a/composer.json b/composer.json
index a2fca05..3a49b79 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   "require": {
     "php": "^8 || ^7.4",
     "clue/block-react": "^1.4",
-    "phpunit/phpunit": "^9.4",
+    "phpunit/phpunit": "^9.5",
     "react/event-loop": "^1.1",
     "react/promise": "^2.8",
     "wyrihaximus/test-utilities": "^3.4.1"
diff --git a/composer.lock b/composer.lock
index a7203cd..a7b3f88 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4777fe9d40703ca8baa368cd9e6597c1",
+    "content-hash": "91615a52a5fcd9f33c010ca112040459",
     "packages": [
         {
             "name": "amphp/amp",
@@ -4219,16 +4219,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "9.5.0",
+            "version": "9.5.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "8e16c225d57c3d6808014df6b1dd7598d0a5bbbe"
+                "reference": "e7bdf4085de85a825f4424eae52c99a1cec2f360"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/8e16c225d57c3d6808014df6b1dd7598d0a5bbbe",
-                "reference": "8e16c225d57c3d6808014df6b1dd7598d0a5bbbe",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/e7bdf4085de85a825f4424eae52c99a1cec2f360",
+                "reference": "e7bdf4085de85a825f4424eae52c99a1cec2f360",
                 "shasum": ""
             },
             "require": {
@@ -4306,7 +4306,7 @@
             ],
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.0"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.1"
             },
             "funding": [
                 {
@@ -4318,7 +4318,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-12-04T05:05:53+00:00"
+            "time": "2021-01-17T07:42:25+00:00"
         },
         {
             "name": "psalm/plugin-phpunit",