diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26eb915..4158150 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ChangeLog
 =========
 
+5.1.12 (2024-08-27)
+------------------
+
+* #243 add cs-fixer v3 (@phil-davis)
+
 5.1.11 (2024-07-26)
 ------------------
 
diff --git a/composer.json b/composer.json
index d0942ed..48caa44 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,7 @@
         "sabre/uri"    : "^2.0"
     },
     "require-dev" : {
-        "friendsofphp/php-cs-fixer": "~2.17.1||3.60",
+        "friendsofphp/php-cs-fixer": "~2.17.1||^3.63",
         "phpstan/phpstan": "^0.12",
         "phpunit/phpunit" : "^7.5 || ^8.5 || ^9.6"
     },
diff --git a/lib/Version.php b/lib/Version.php
index 38efec4..4ac82f6 100644
--- a/lib/Version.php
+++ b/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    public const VERSION = '5.1.11';
+    public const VERSION = '5.1.12';
 }