diff --git a/composer.json b/composer.json
index 7d0fa25..8480750 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "PHP 7.x compatibility checker",
     "require-dev": {
         "squizlabs/php_codesniffer": "3.3.2",
-        "phpcompatibility/php-compatibility": "9.0.0"
+        "phpcompatibility/php-compatibility": "9.1.0"
     },
     "prefer-stable" : true,
     "scripts": {
diff --git a/composer.lock b/composer.lock
index 3edc318..d779026 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,21 +4,21 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "80f55e0b3b31cbdcfd1ad80657fa104c",
+    "content-hash": "4ceeff7f69b215507ac56fdb998e7dca",
     "packages": [],
     "packages-dev": [
         {
             "name": "phpcompatibility/php-compatibility",
-            "version": "9.0.0",
+            "version": "9.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
-                "reference": "e9f4047e5edf53c88f36f1dafc0d49454ce13e25"
+                "reference": "a898db5410e365eeb658c63a76bd08d211769321"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/e9f4047e5edf53c88f36f1dafc0d49454ce13e25",
-                "reference": "e9f4047e5edf53c88f36f1dafc0d49454ce13e25",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibility/zipball/a898db5410e365eeb658c63a76bd08d211769321",
+                "reference": "a898db5410e365eeb658c63a76bd08d211769321",
                 "shasum": ""
             },
             "require": {
@@ -63,7 +63,7 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2018-10-07T17:38:02+00:00"
+            "time": "2018-12-16T19:16:39+00:00"
         },
         {
             "name": "squizlabs/php_codesniffer",