diff --git a/composer.json b/composer.json
index 0ac263e550e1d3b6bc91f43f850add5176b89b94..6b2c66af08bd7fa0995ec24e8a257ecfafed0a85 100644
--- a/composer.json
+++ b/composer.json
@@ -115,7 +115,7 @@
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 		"phpstan/phpstan": "^1.11.3",
 		"phpstan/phpstan-phpunit": "^1.4.0",
-		"phpunit/phpunit": "^10.5.5",
+		"phpunit/phpunit": "^10.5.21",
 		"sokil/php-isocodes-db-i18n": "^4.0.22",
 		"symfony/translation": "^6.4 || ^7.0",
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diff --git a/composer.lock b/composer.lock
index 17ae04c667dc8b2f63ccf579577c0af61e402cfb..2fa9c484273d40fdfcb271b9e566b4dfb96c3901 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "58de6f42a618f1d81d7b607612a3459d",
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@@ -7311,16 +7311,16 @@
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         {
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-            "version": "10.5.5",
+            "version": "10.5.21",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "ed21115d505b4b4f7dc7b5651464e19a2c7f7856"
+                "reference": "ac837816fa52078f7a5e17ed774f256a72a51af6"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/ed21115d505b4b4f7dc7b5651464e19a2c7f7856",
-                "reference": "ed21115d505b4b4f7dc7b5651464e19a2c7f7856",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/ac837816fa52078f7a5e17ed774f256a72a51af6",
+                "reference": "ac837816fa52078f7a5e17ed774f256a72a51af6",
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@@ -7392,7 +7392,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.5"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.21"
             },
             "funding": [
                 {
@@ -7408,7 +7408,7 @@
                     "type": "tidelift"
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             ],
-            "time": "2023-12-27T15:13:52+00:00"
+            "time": "2024-06-15T09:13:15+00:00"
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         {
             "name": "psy/psysh",