diff --git a/composer.json b/composer.json
index 1e5c62f8..e53d1630 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
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+    "phpunit/phpunit": "~9.5.12",
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diff --git a/composer.lock b/composer.lock
index 849df16a..a1f44bb4 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "83b580f128035db7f873ee95f577ceff",
+    "content-hash": "f9930f257c43faa52a5a6f494ff54fdd",
     "packages": [
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             "name": "justinrainbow/json-schema",
@@ -1824,9 +1824,6 @@
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-            "replace": {
-                "myclabs/deep-copy": "self.version"
-            },
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@@ -2807,16 +2804,16 @@
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         {
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-            "version": "9.5.11",
+            "version": "9.5.12",
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                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "2406855036db1102126125537adb1406f7242fdd"
+                "reference": "93d4bf4c37aec6384bb9e5d390d9049a463a7256"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/2406855036db1102126125537adb1406f7242fdd",
-                "reference": "2406855036db1102126125537adb1406f7242fdd",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/93d4bf4c37aec6384bb9e5d390d9049a463a7256",
+                "reference": "93d4bf4c37aec6384bb9e5d390d9049a463a7256",
                 "shasum": ""
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@@ -2894,7 +2891,7 @@
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             "support": {
                 "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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@@ -2906,7 +2903,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-12-25T07:07:57+00:00"
+            "time": "2022-01-21T05:54:47+00:00"
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