diff --git a/composer.json b/composer.json
index 98f33fc5..b98fc3dd 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
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+    "phpunit/phpunit": "^9.5.12",
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diff --git a/composer.lock b/composer.lock
index 2dd71cdf..c6724201 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "996a07c1d25804893531dd72fe22df4d",
+    "content-hash": "4c331c0aebfd20c9976910e8b1309c2c",
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             "name": "composer/pcre",
@@ -3952,16 +3952,16 @@
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-            "version": "9.5.11",
+            "version": "9.5.12",
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                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "2406855036db1102126125537adb1406f7242fdd"
+                "reference": "93d4bf4c37aec6384bb9e5d390d9049a463a7256"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/2406855036db1102126125537adb1406f7242fdd",
-                "reference": "2406855036db1102126125537adb1406f7242fdd",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/93d4bf4c37aec6384bb9e5d390d9049a463a7256",
+                "reference": "93d4bf4c37aec6384bb9e5d390d9049a463a7256",
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@@ -4039,7 +4039,7 @@
             ],
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                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.11"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/9.5.12"
             },
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@@ -4051,7 +4051,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-12-25T07:07:57+00:00"
+            "time": "2022-01-21T05:54:47+00:00"
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         {
             "name": "psalm/plugin-phpunit",